Re build up and just Testing KT88/6550 Single Ended Amplifier on 5th Jan 2014
How about use for sound source from Raspberry Pi B+ This is not toy..High End Audio
Relation with solar activity and radio wave propagation
This site http://www.single-ended.com has over 300 access's/day,from OUT OF JAPAN.
Many thanks to " Audiophiler of the world ". from USA, France, Germany ,Italia
and Europa,both of Canada , Mid East country and Mediterranean country
South Asia and South America, Newzealand ,Australia recently.
There is no even-order harmonics in a push-pull amplifier, there is no odd-order harmonics to a single amplifier,
most of the single amplifier distortion is coming from even harmonics. Harmonic closest to the human hearing is the second harmonic,
but the second harmonic is not included in the push-pull. Moderate second harmonic I think this is one of the is made to the kindly human feelings?
Electrical characteristics is perfect in a push-pull amplifier, but I listen as the sound
I feel lacking something.The negative feedback is that ran in push-pull amplifier most.
All Menu of my experiment Valve Amplifiers and Solid State of this SITE
Please see above Site(push ICON) for new plan
Do you know many person said KT88/6550 Single Ended Amplifier's Sounding is
better than 300B Single Ended Amplifier
Do you know ? well ,show you how to build up single ended amplifier El34,KT88,6550,6L6 and DHT
because Build up 300B Single Ended Amplifier is very difficults and get good Audio Transformer and expensive
but even if use high quality audio transformer like Tango XE20S ,will be get good tone from KT88 Single Ended Amplifier.
It will be to try on a trial basis a transformer of high quality that it is not possible to use the Tango transformer in the current situation.
Trend of the sound of single-ended amplifier will get involved in the quality of the output transformer to be a single. Trend of the sound will be determined by the output transformer
and vacuum tube of the points driver stage two when given the proper voltage.
4P1L Ultra Linea Single Ended Amplifier Up View only 3 W rms4P1L SEP
KT88/6550 Single Ended Amplifier 5th Jan 2014
Note: 6550 and KT88 are same charactor so each other you can use .originally I do not know exactly but almost same sound and same voltage getting each other.
pin 1 must be connect with cathode or ground or connected 1 and 8.if you would like to use EL34 family have to connect 1 to cathode.
this time using XE20S Tango,sound is very clear just like original KT88 sound. mid and high are very bright. and low is good if using good transformer like XE20S.
I like these kind of sound .just like 2A3 and 45 single ended amplifier but much more powerful .schematic indicated 390V but this time using 320V-310V plate voltages
getting 8 W rms power ,it's enough to use my small room with 91dB Speaker.very clear sound.but really KT88 sound goes out when use low voltages so must be use 390 V for
plate voltages of KT88.
Note : 6L6 family is almost same as EL34 ,,6L6 is just similar of 807 , looks very different but same tube.be care full to use screen grid voltages. please see Duncan amp
each other. if using as single ended amplifier as EL34 ,can be use 6L6 .if EL34 get 8 W ,probably to get 6.5 W rms when use 6L6 family.Spec said will be get 10W rms with
6L6 but actually never get 10W rms. almost same 6.5 W is normal.
KT88/6550 Compatible Single Ended Amplifier 5th Jan 2014 (using fladance mp player) 8W rms
I set the amplifier using vacuum tubes of different types in the same circuit this time. I have to output tube famous 5998A as indirect heater triodes.
please see 5998A Single Ended Amplifier
Tubes Data from tubebbs.com
Just comment from Mr James Strasser
I started my DIY amplifier building by first building a pair of mono 300B SE amps.
They were nice sounding, however I did not like the tubby/fat bass sounds of the 300b tube. I tried building another pair of 300b amps trying to get a better bass response,
which I failed at also. So then I built a kt88 SE amp. This amp sounded very good, so I built my KT120 amp. That sounded much better,
but I still thought I could build a better KT88 amp, so I built another KT88 amp using 6SL7 tubes. These fat tubes made the bass very slow and tubby also, very similar to the 300b sound.
He said,,,, above.how about ? what do you think ? so how about start build up one of KT88 Single Ended Amplifier.
If do you have interesting about NOS tubes ,reasonable price to buy from him
please click above from 1995 to 2012
On 2002 ,EL34 Single Ended Amplifier made in Chile by lagartoSchematic
EL34 single ended amplifier Made in Chile on 2002
Kanto plane (Area of Tokyo) Auido Builder Meetings
Just Let'me introduce you Japanese Amplifier builder meeting at Kanto Area please make click next line
this is mine. so you do not like sound ? probably do you like sound of STC Amplifier sound.first try to build up
Gold Lion KT88
this counter numbers since 11st June 2006
Your PC is using
This flag counter started from 18th Oct 2011
New Single Ended Amplifier Circuit by UL
Just Plan for build up E34L UL Single Ended Amplifier 2012
Japanese Audio Magazine MJ show above circuit few years ago as instead UL get good result
Inter Net News and Music by English in Japan
Introduce japanese internet radio menu site
but only japanese is next
original circuit is using Perque(porque)drive design by Mr T Kimura as Perque and modifi by Lagarto
6550/KT88(UL or Triode) Single Ended is good but EL156 is King
Link to EL156/KT88 and KT90 SE and KT120 Single
Single Ended Amplifier is use only Class A
for enjoy any music if you have good speaker system and C/P is good than 300B SE,valve are low
cost than 300B's.but speaker system need at least 91dB/m/w.and wide range speaker like B&W, Klipschetc.
KT88 and 6550 are almost same charactor so you can use each other same amplifier.
but some bias adj.KT88 are not same sound getting if Maker is different.please try it's.
Any Penthodo grid bias are less than Triodo's bias so please try to use any kind of driver.
which is SRPP, one tube triode like 12AX7(ECC83),6DJ8, one of the penthodo drive by EF86,6SH7,any .
impedance are 3.5K ohm if using high voltage for plate voltages.cathode resistance are
around 390 ohm 10W ~ 20W.just try to drive any kind of driver by UL and wired Triodo.
Europian Tubes bias are almost a half of KT88,EL34,6L6GC 's bias
Not only Power,,,,,using 91dB/w/m on 27th May 2014
Make Click for jump to 4P1L Single Ended Amplifier Site
ISO Tango was broken down business but still some small transformer company doing brew Tango line-up Transformer like XE20S
Company name is Hatt Audio Lab, very small company but they are making same line up of ISO Tango Transformers. character is much better than ISO Tango and
slightly low price from them.let's me show you PDF file PDF filefor catalog but in Japanese only.
The Real Audiophile does not care about small power when one is using
Single Ended Amplifier.
2nd harmonic makes different tone,depend on how fixed driver valve.(PP does not have 2nd Harmonic.)
Power of Single Ended Amplifier
is depend on capacity of Audio Out Put Transformer and Power supply.
Why use Single Ended Amplifier ?
Single Ended Valve Triode Amplifier has not same tone with Push Psu Amplifier.
over 90% persent of Amplifiers are push pull,and push pull amplifier does not 2nd harmonic and off course
does not get 2nd 4th, 6th harmonic.vs SE has 2nd , 4th, 6th harmonic.Push pull has minor distortion than
SE Amplifier.2nd harmonic is make good tone for Music.not too much and not less than.feel good sound get
from Single Ended Amplifiers with high effency speakers from 88dB/m to 100dB/m.I means Single Ended Amplifier
is almost Single Ended Triode Amplifier.or Penthode but wired Triode. Tone is Different.good for Jazz and
small room Classic(Trio,Quartetto,etc.)
if do you have a good efficient speakers( like a over 91dB/m/w),you may use a 2A3SE(6B4G).
and 2A3 SE is most good amplifier than any kind of Hi End Amplifier .I live small
apartment so good enough to use 2A3 SE with Tango XE-20S Transformer.but lets me show
you KT88/6550/EL34/KT77/ Compatible Single Ended Amplifier.twice of power of 2A3 SE.
I guess depend on 6550's plate current made up good sound than 300B SE.300B SE is
get good sound but depend on output transformer and plate voltages.many 300B SE does't
get "real 300B tone's" even power does't reach 8W rms and frequency response are narrow.
Let's doing to brew 6550/KT88 SE Amplifier D.I.Y
One of famous Valve Amplifier MFG.Spec said 300B Single Ended Amplifier has 8W rms so on
but real is 6.5 W rms.useable power is 6 W rms.you must know.
other way 2A3 SE with Tango,Tamura Transformer.can get easly 5 W rms power.valve cost es a
half of 300B Russia,China.which is good for you.
Valve Amplifier is ,depend on quality of audio transformer.
which is better for Valve Amplifier ? Japanese Transformer are best for use.
Tango and Tamura ,and Hashimoto(Sansui) are best. I prefer to use ISO Tango for
reasonable charactor and price.Tamura is very best but many Tamura Transformer are
super expensive but recently Tamura introduce new line for novice we call it's F900 line
price is reasonable.
Hashimoto are good too and reasonable price.
I do not recomend use James because quality is not high.even they said ,Japanese
Iron using but charactor is not so good.Inter stage Transformer is Tamura and ISO Tamgo
and Hashimoto. recently many DiYer using Lundahl Transformers for impedance matching
transformer and interstage transformer.
my James WE300B single ended amplifier is using long time ,,,sound great with any type of 300B right now.
6N1P SRPP with Fluency Wide Band DAC This Site wrote my poor english and very
Bad anyway !!!,but this WEB site is not English program site. make sure please
under stand "really what are you would like to KNOW ? " .
Kenji and as Lagarto san from Sakura Chiba Japan
if do you have interesting on 2A3 and 45 SE make click next
Easy drive by 2A3/45 Single Ebded Amplifier Dr Joaquin Chile 2010 Apr
New 2A3/45 Compatible SE
KT88 Single Ended Amplifier brand new on Sep 2011
Mr Tim Williams Electronics KT88 Single Ended Amplifier D.I.Y Step by Step from Australia
next very simple
circuit .DF is 2.5 ��depend on NFB EL 34 got power around 8 W to 9.5
W and KT88 is just like same power. 8.5 W and max power
is 10 W.may be
10W power get feel like destortion I am using cheap out put transformer
but sound like
very great.may be good for Cuerda like a chello.this is UL connection. this time use small
transformer 320-0-320 and 180mA .so is not enough to get high power of
6550(KT 88).if you are obtain good 20W -30W output transformer for this amplifier. and good high
capacity of transformer such as 350-420V DC ,280mA DC. probably you may get
more than 15W rms at 6550/KT88 .this time i got 80mA at KT 88 cathode. should be choose 390 ohm
( correct cathode resistans or fix bias use under negative power supply)
and plate voltage is around 370 - 420 volts better.meaning around plate current are more than 105mA
.when if you would like to get big power, necessary 2 stage driver.this srpp circuit is not
enough to drive high voltages condition.Power
tubes can be use EL34 ,
KT88 , 6L6GC instead of 6550.I will say sound of EL 34 Telefunken is beautiful sound
you can get and EL34 Svetrana too. coupling capacitor are ASC for KT88,
Vita Q for EL34 or any kind of oil capacitor and one thing SE ,
any SE are around 30%--35%(some time 25%) efficient from max dissipation
original tubes. depend on Auido out put Transformer and power supply
are good one.many old japane builder choose 2 time capacity of transformer
so if would you like to get some 10W power out put. you need 20W output
transformer.It's Class A SE Amplifier.
And let's me tell you about minor distortion of amplifier.we call it's
"Cancel of distortion"from driver tube.if driver tube does not have any
distortion ,will be get major distortion out put stage if are using single
ended Amplifier.it's meanning diver tubes must be made up some distortion
for canceletion of distortion of output tube(ex KT88 etc).any voltage tube amplifier
has 2/3 zone character.so starting position are always get non lineal distortion.what
meaning if you are using one of triode amplifier for driver .necessary to adjust
load resistor for minor distortion of OUT PUT stage.please under stand,
driver tube is very important. if driver has good character does not
make good result on output stage minor distortion.so with your ear or connect
distortion meter with your amplifier then adjust value of load resistor of driver.
if choose SRPP for driver . It is difficult adjust distortion at driver stage.
point of how to change sound: 1st decoupling of cathode capacitor are
using good Audio Capacitor like a MUSE NICHICON , Black Gate etc.
sometime use one of LED(Light Emitting Diode)instead of RC network.
please try to use LED decoupling element for 1st stage of cathode .
explane for Distortion ,please move mouse on the Icon.
Circuit is next.
this circuit is not original SRPP.we call it's "u(mew) follower for a little
more Gain than SRPP normal.
Diode are Kick Back Diode Diode: diode has
some effect ,some one call it's "Kick Back diode".protect
from your speaker.diode makes cancel voltage from voice coil.
try "connect diode "or "with out diode".with diode makes much power and
good response of low range.
you can hear something more ??.believe it's? if would like to test how
to function please try to use good diode some of over 20A diode is best.
some time say,Kick Back diode called as stopping diode,this diode can be use
any kind of rectifier diode.voice coil is shown above as L1 and this inductance
produce small voltage when speaker cone is moving,just like same kind of SW( Standing Wave)in RF circuit
going back from voice coil of your speaker system.so sounding and Df are a little
bit down with normal sound.D2 is old technic with RF power circuit.same kind of
Basically Fujii Amplifier technic.kind of D2 is best to use as same valves of Power tube
connected wired diode and get miner distortion than without D2 diode.
Just try !!! connected one diode on screen grid.you can get sound good.
Diode 2: Many peroson believe direct heating Rectifier tube
make different sound with
5V4G and 5Y3 if using , each tube has different character ,sound is very
if your transformer has filament voltage please try to use Rectifier
tube like a 5U4G
if you do not enough voltage , 5AR4 can be get good plate voltage better for use.274B
Golden Dragon is good when
I use the Rectifier tube for power supply.274B
Dragonis sound very nice bass.
even 5V4G too.if you can get easy 274B
Western Electric much better but very
Rectifier tube has 3/2 charactor into your Amplifier.
KT88 Single Ended what kind of OUT PUT Transformer need ? In generally,KT88 SE 10 W means around 15 W(min)capability of Audio transformer
needed and power transformer is at least 170mA 420V from 360V for UL and Triode
connection or bigger.if would like to get more than 10W rms like a 15Wrms
at KT88 SE necessary 20W power output transformer.power transformer is around
250mA DC and Volatege is from 360V to 420V DC.impedance are form 2.5K to 3.5Kohm.
depend on connection mode.10W transformer means appx 8W rms max power.many Japanese
""hobbyst said 2 times out put power transformer use for single ended amplifier.""
and which is better with gap and without gap.with gap is very prety sound high range.
but with out gap is very low side are good.without gap transformer need some
compensation of high frequency range.with RC network etc.Valuve amplifier are depend
on Audio OUT PUT transformer.many people said "size of core".and should be use
Most important thing:
If do you have good audio SE transformer with UL. please check frequency response with some
audio generator and AC mili meter.if did you get some ripple odd curve
on around from 40Khz to 60Khz frequency range means not good use for UL connection.
UL connection Amplifier will be oscilated some high frequency with all over NFB.
be carefull to use Single Ended Transformer.if transformer does not have a ripple and
ripple are over 100Khz. does not matter. but many audio transformer has ripple.be care full!!
even OPT-10S has ripple 40-60Khz zone.not good for UL penthode Amplifier with NFB. most 2 type of Transformer .one of EI core general and EI with gap U-808 ,XE-20S and many Tango's transformer are with gap and EI core.but some
Transformer like Harmmond transformer are general EI core.EI with gap and EI
with out Gap are just 2 different tone has.and many with out gap EI transformer
has some ripple on around 40Khz from 60Khz. Harmmond and Touei , noguchi transformer
has some ripple in high frequency range.what is meanning ? probably will be get
some oscilation with UL penthode when if used over all NFB.be carefull to use
with over all NFB.these are charactor of EI with out gap.but with out gap
transformer are very good low frequency response.many D.I.Y Transformar are almost
with out gap transformer. gap transformer is generaly good response on
high frequency range.James Transformer are material Japanese and Made in china.
many american and canadian Transformer are EI with out Gap .probably thay has
ripple at high frequency range.even some high cost europian transformer too.
many transformer type B and type A is Japanese Transformer I Knew and recommended
Tango,Hashimoto(Sansui)and Tamura.even some small transformar factory made too.
please see first frequency response of Transformar if did you get.it's not price
of transformer.some cheap transformer made good and sometime very famouse transformer
does not have good curve.meanning no use for Single Ended Transformer.be carefully
to use SE transformer.
one thing KT88/6550 Load Impedance is depend on high voltage low current
or high current low voltages.so 2 type of impedance.this is not only KT88/6550
valves low and depend on typical amplification mode like a Class A, Classs AB
etc. some one would like to use 2.5K so should be use high current and low voltgae
for plate.some one would like to use triode mode, should be use 3.5K or more
(like a 5K load)and voltages is high ,current is low.so G1 bias is high.thoes
things are depend on what kind of amplifier would like to build.
and size of Single Ended transformer is twice(or more)size of Push Pull
Transformer,so if 10W SE transformers core can make 20W push pull transformer.
small transformer never can get good low response depend on Material of core.
If do you have interesting more "study" for load impedance please see
study site like a please see it's**
Very good "Study" Site from "Valve Wizard from UK"
How can I use valve for Amplifier How to use all about valves
How to caluclate Power and self Bias ?
ex) EL34 how to caluclate Power,distortion and Self bias
so how to calculate EL34 ,bias and power.
first please seek EP-IP character curve where get from some data site
like Duncan,K7 site for valves.
just example is for EL34.B+ is 350V ,Ib=72mA .point of S is -26V passing 3.5K
load resistance .point A is Ec and 0V, S is point of bias and point of B is
-26V X 2 so -52V lower side.always need character curve for calculate
value of valves.we always decided to calculate proper value when start build up
an amplifier.any valves can use any load impedance but have to calculate each
time. Peak power get when grid reach 26V peak.so RMS value is 26V/1.414= 18.4V rms
so you need 18.4V rms signal into control grid.cathode bias resistance is
Rc = 26V/72mA= 361 ohm. wattage is 1.8W , you have to seek some 5W resistance
for safty.many time use cathode resistance are 390 ohm and +B is around 360V.
when are you would like to work as EL34 triode connection.triode connection
means many time use load impedance is around 3.5K ohm.so you can caluclate
easy for penthode condition.but one thing very importat is audio transformer
is enough to use for Single Ended Amplifier.which do you have.
again built up KT 88 single
amplifier on 24th May 2004this time use
power transfomer.max rate is 210mA currentcapacity.and plate
320V.cathode resitance are 272ohms.272 ohm slightly
normal.i selected this value for compatibiltyof EL 34.so you
never use EL 34
,shuold be 150 ohm for cathoderesistance for
6550 and KT 88
better.I got around 25V
so current are
some 90mA include G2 current.I never know 6550
and KT 88 are
different charactor.sound like EL 34but 6550 is just
like a 6L6GC but more potencial.KT 88 's high frequency
response are very nice and sound like aEL 34 .this time I
took off 500K 18K and 0.1uF networks.and does nothave over all NFB.only use UL
connection.UL is some kind of NFB as youknow about it.
around -3dB NFB ,could be get on final stage.but slightlybright sound I
got.so heve to give some over all negative feedback aroundfrom 3 - 6 dB for good
2.6K .OUT PUT
Transformer are small
economic model.OPT-10S USD $ 33
(Toei Trans Co
: 500K , 18K and 0.1uF network(u(mew)Drive is not necesary if you can get
suffucient power from power
tubes.so you can take off these components.Rf is need to adjust with
AC dB meter respect with DF (damping factor
) of your speaker system..I guess 3 stages or 2stage p-k reguler amplifier are better
for enough to get power.such as a triode -cathode follower and final stage is best choise of
amplifier.and get powerful sound.even i got very powerfull sound.heater bias needed for
SRPP stage for protect cathode of driver tubes . Choke coil is 5H
Input capacitor are no exceed to 47uF 500V.so max is 47uF for 5U4G
for protect 5U4G
rectifier tube.more than 47uF get damege of rectifier tubes. please see 5U4G spec.
some bypass condensor are MUSE
condenser and Black Gate.and coupling are film capacitor
and Vita Q in parallel.Vita-Q get more natural sound.sience 8th Mar 2004 from
*this parts Update 26th Nov 2005 K.M*
How to calculate coupling capacitor for low frequency Amplification
Coupling capacitor value select ,depend on internal resistance of driver and load resistance and grid leak resistance value.
please see next Fig and off course Single Ended Amplifier bass is depend on large core of audio transformer. so small transformer does not get enough low.
these case is not only penthode ..even use same theory use for triode. triode low impedance tubes are much more reproduce low than penthode.
grid leak resistance of KT88 must be use around 220K ohms. and if use 2A3 triode use less than 500 K ohms.many case say 2A3 is around 200K ohm (130K)...
KT88 is around 150K ohms ...must to use.not reach to 220K .please see next
very important.value for "No Screw Up Tubes".for example RCA 50 is max 10K ohm.very low resistance.in general triode are very low.
cut off frequency of KT88 is around 1.6 Hz when use 0.47uF coupling capacitor and grid leak resistance choose 200K ohm. but depend on impedance of driver.
many case coupling capacitor choose around more than 0.47uF in that's case.easily to calculate roll off frequency ..please try it's.
when using fix bias for KT88 must be use 100K ohms grid resistace and fix bias of 2A3 use max 50K ohms.if your amplifier has good and large core of Transformer
please choose good value of coupling capacitor and grid leak resistance,,probably will be get good low frequency response .
if one amplifier need NFB must be calcurate reasonable staggered ratio.
This picture is EL34 and 6B4G
(same like 2A3 but 6.3 filament direct heating valve)
on 26th Nov 2005
with switch +B 320V to +280V and filament voltege is trough rectifire
bridge some condensor into filament or heater of EL34.
same US Octal Base you can use both way indirect and direct heating tubes.
I got 4.5 W output when I used 6B4G Single Ended mode.sound like small
300B sound and very clear.felt
much power than EL34 SE .however half power of EL34 SE.
6B4G and EL 34 Compatible
Amplifier ( 6B4G and EL34 are same US(octal)BASE used)
Circuit diagram is next.
How about will you replace resistance in your an Amplifier
Do you know ? material of resistor change sound ?
actually we can use 2 type of film resistance for Audio circuit recently.
(A) Carbon film resistance
these are film carbon resistance
Charactor: sound is very clear low to high frequency and feel sound is clear and good
for pre-amplifier or flat amplifier.
famous resistance are "Allen & Bradley carbon solid resistance" "AMRG" "Rikenorm Riken RMG" "AMRS"
"Rikenorm Riken RMA" "Taiyo FTR" "Rikyu RD-25TJ" "Takman REX resistance" etc etc
(B) Metal film resistance
and this is Metal film resistance RSN1S TDO resistance
Charactor: Sound is good low ranges and good high range . if your amplifier does not get good low(Good Bass).
please try to replace of all resistance of Metal film resistance. You will be get good Bass and high frequency
tone. famous resistance are "KOA metal film MOS1/2C " "Vishay Metal film Z201" "Skelton Fukushima-Furaba"
"TDO, Solist or Takman Metal film" "Vishay MBB0207-50F" "AMRA" "Rikyu RO-25CFK"
"Vishay RN65D" "Takman RLF" "Tokyo Koon denpa RD" "Nikkohm solid resistance RP" "Alfa Electronics FLCX"
"Vishay VSR" "Takman REY" etc etc.
so recently I like sound of "Takman REY" and "Takman RSN1S" to get good bass from
my single ended Amplifiers.Nikkohm RP are good too.
Takman Resistance Co Japan
Nikkohm Matal Resistanceuse for High End Audio and RF
so Resistance change sound of your Amplifiers.
probably the carbon resitance are good for pre-amplifier and some parts in power supply circuit.
how about you ? please try to use different resistance into your amplifier D.I.Y
Bias is , if do you speak english ? automatically knows about what is bias.
bias is A divide by B , A is Ip current , B is Ep current.
some one said which is correct bias for EL34 etc. I said that correct bias voltage
does not have.so it's is depend on what kind of transformer do you have? and
what kind of connection do you would like to use and depend on what kind of power
suppuly use.if would like to use high voltage like a 420V. plate current should be
chooese low.and out put impedance is high.if would like to use UL or triode connection
bias is high voltage, low current and impedance is high like from 5K to 3.5K ohm.
if would like to use low voltage like a 250V. must be use high current for plate.
and depend on type of Amplification as A , AB1 etc. single-ended means Class A.some
time use class A+A2 etc.disspation EL34 is 25W so you have to use less than 25W .
caluculate Ep X Ip .ex) -26V Eb 350V Zp= 3.5K 26V X 1/√2= 26 X 0.707= 18.4 V rms
26/70mA = 370 ohm.if you are using auto bias. you are use 370 ohm.these value is
depend on 3.5K ohm line on Ep-Ip curve of EL34.70mA means, Max is 130mA needed
plate current.3.5K ohm is triode connection.in generally use 2.5K ohm for penthode.
which impedance you would like to use is first then I can know about bias, Ep and Ip.
easy to caluculate if you can get Ep - Ip curve for each tube.A1 triode is 370 ohm
for cathode.Ep is 375V.Rl is 3K, 250V ,-14V for Eg and cathode is 14/0.07 = 200 ohm.
same way if use 2K imp and -13.5 V for Eg then 13.5/0.1 = 135 ohm.
Bias for EL34 is depend on your mind.your favorite sound.in generally EL 34 plays
2.5K load and G1 Bias is around -13.5 to -14.5 V Ip is 80mA 175ohm for cathode.
when plate voltages is 250V.will be get sound like grave.and POWER is around 10W.but
10W rms with EL34 is critical.10W EL34 is depend on your Transformer.small one get
small power.disspation is 25W so if choose 100mA Ip and you must be use plate voltage
is less than 300V.must be use 250V for plate.and if would like to triode connection
Rk is 390 ohm and plate voltages are some 370V.automatically load impedance is 3.5Kohm.
sound is each other different."GB multiplication is always iqual(same)."
About coupling capacitor , please
choose proper value for
cut off at low position frequency
and in circuit you can see 0.33uF 630V of C and leak resistance of 300B
is 100K to 300K R
you can caluculate how fx= 1 / 2x3.14 x CR = 159 / C(uF)x R(K ohm)
ex) fx= 159/ 0.33x 220 = 2.19 Hz.roll off frequency.so first you need
how much at least need 300B grid leak resistance and please caluculate
value of C and R are very important.and SRPP gain is depend on from 1K
ohm to 10K ohm
to replace load resistance.sound is depend on you like which are choose
and leak resistance if you do you have some high value inductance some
more than 400H
.for grid choke when are you would like to use 300B , 6B4G etc.
Film Capacitor has direction
any film capacitor has direction .film cap made up inside to outside.inside of core
is "Output" and outside is "Input".next is indicated detail.
if one's use Arizona Capacitor ,,blue Cactus figure side is out side(end) of wound so input where connect high voltages.
other case is if use for bypass outside is ground.so blue Cactus side is ground. some case is different . please ask components mfg company
which is end of wound. must be ask to them for to get good sound.very important.
Arizona Cap Blue Cactus and Green Cactus(brand new 2014)
If do you would like study more something about an amplifier.
please see "Stagger Ratio"for An Amplifier design.
Not only 300B triode even penthode like KT88
have to adjust C(coupling) and R(leak resistanse)under SPEC of
TUBES.most important thing is" how is sound with your speaker system
and your room where you are always listen faber MUSIC."at least
you need know DF(Damping Factor)of Penthode is very low.like 0.5
but Triode (low mu like a 10 from 3)are around 2-3.Direct heating
Triode (45,2A3,50, 300B ,275,VT52 etc) are useble as a NON NFB
SE Amplifier.but Penthode are not.Penthode need NFB or 2nd Way.
"UL is kind of technic of NFB" and UL get around 6 from 3dB
of NFB into final tube and closely same effect of cathode negative
feed back at output tubes cathode.I always feel good -3dB with
many Valube Amplifier with high effiency speaker(over 90dB/m/w).
and always I asked many person how much did you get DF your
Amplifier D.I.Y? if some one said DF=1 . I said OK bad amplifier
did you built up.Power Amplifier are not power.Power amplifier has
Good DF.push pull get around DF=10 and SE get around 2-3.
An Amplifier SE D.I.Y has good DF at least 2-3.can move yor JBL and if
would like to use SRPP for Drive ,output impedance is very low but gain
is not enough for power tubes so you can caluculate gain for SRPP drive
to set up your power tubes ,please see for some idea more gain of SRPP
here .ex) ECC83 if use , cathode resistance are around 1k ohm to 2.5k generally
but some time need more output gain.please to try to use value of from 2.5K to 5K ohm.
Note: Russian 6550 and KT88 are almost same cahactor.I think same tube.
if driver can get max 40V rms , can be use any drive amplifier like P-G amplifier by 12AU7
ECC88 etc of one driver.KT88 sound is very similar of good triode amplifier.
but EL156,KT90,KT120 are almost same kind of sound.not get mid high is clear.
KT88 single ended amplifier is just like good triode amplifier sound and good bass.
charactor is just same sound of EL34 but more powerfull.off course depend on good
transformer use.transforemr is at least need 10(20Hz) to 100Khz(80Kz) bandwith.
10 W rms power so need more than 20W capability of power.so KT88 single ended Amplifier
very popular for Audiophiler.KT90 is not same family of sound of KT88.KT90 is
PL509(top plate) Sweep tubes modificated.sound is very tight and dry.for me
not recommended to use audio amplifier.EL156 China is not bad and easily to drive
any kind of drive amplifier ,just a half of 6DJ8,12AU7 enough to drive.
whay can I say,,,,KT88 is the king of valves.looks good ,sound good, easily to drive.
other way Triode Single Ended Amplifier get sound of other world of sound.
some one said,,, often get low edge oscilation around 50hz-100hz sometime 20-50hz... I think problem of phase .some circuit has NFB over all ,just like NFB from 2dary of audio transformer
to 1st stage of cathode hooku up some resistance with small capacitor in parallel .small capacitor is around 100pF to 300pF depend on low frequency boost.1/6.28*CR =frequency
almost 3 stages amplifier are input line and out line is same phase so have risk of osclation.if does not would like boost please take out small capacitor for protect low edges oscilation.
or change value of capacitor.just cut and try to choose value.and
if some time blow up fuse when turn on amplifier... because oscilation when unstable condition of power supply by turn on.
if using 2A fuse please use a little bit more like 2.5A or 3A fuse or slow blow.2A3 single...KT88 single using 3A anyway in my amplifier.///// I am so sorry bad english to wrote.please
understand ,,what is meanning. note:25th Nov 2013.. from Sakura Chiba Japan.
Fujii New Tech Amplifier for EL34/KT88 Single Ended Amplifier
Idea from most 2/3 multipul charactor amplifier and 3/2 multipul
charactor of Diode tube.good factor for Penthode SE Amplifier.
Mr Fujii said you can build up one of very low distortion
Penthode SE Amplifier like a push pull effect.what do you think?
Distortion is 1/20 time less than general penthode SE Amplifier.
what do you think ? cathode chork drive amplifier made up
30% more power than general g-k amplifier and I guess get some
3/2 multi curve and less distortion than general coupling amplifier.
if you would like to use triode connection KT88 for final.may be get
just like 300B sound from penthode.and limited cathode current
up very different sound.often LM317 for cathode of 300B and KT88 make
diffrent sound amplifier.I guess ,,,,,6550/KT88 Triode connection sound
better than 300B SE.???. ???.
Proto Type 6550/KT88 SE Amplifier and Most Latest Model is
Idea of Grounding point in the chassis
Let's me show you some example here
to Click and it's is not only this way to made up good one of
important things is ground wirering when would like to build up an amplifier.we call It's
"ONE POINT EARTH".(Itten earth).very important for any kind of Amplifiers.any Kind of Audio
Amplifier even High End Audio Amplifier like a Jeff Rowland, Sony too.
The World of Cardamom's
Strange but not Stranges Amplifier from Mr Cardamom's
I think 2A3/45 SE Amplifier get best sound than 300B SE and KT88 SE
frequency reponse is from 10Hz to 35KHz -3dB by Noguchi PMF-7WS.
Max power is 4.5W rms under 2A3.
next I will be modificate above amplifier to WE 91B type circuit diagram is next one and driver is EF86 UL connection type.
2A3 Single End Amplifier is better than 300B Single Ended Amplifier ???
driver using 5687 High current heater Miniture valve, double triode medium mew MU 16-18.
FE-12S is new 2008 model of ISO TANGO in Japan for SE Amplifier.max power is
12 W rms. recomend valve are 2A3, EL84, EL34 and 6L6GC etc.this is an universal transformer so
out put impedance are 2.5K, 3.5K, 5K and 7K ohm.frequency response is from 20Hz to
80Khz at 2.5K ohm and from 45Hz to 35Khz at 7Kohm, Max current is 60mA DC,1.6Kg each.
SRPP is very nice clear sound get for 2A3SE.but It's very difficult to get
enough gain when do you play classic.needed other low gain amplifier before SRPP
driver.I like sound of SRPP with ECC83.some one said 6N2P is good.
even 3 stages direct coupling driver with 6922/6DJ8 is good sound and enough to get
much gain when play Classic.Power is around 5W rms at 3% with Sovtek 2A3 and clear
sound.2A3 EH gold is a little bit expensive than 2A3 Sovtek and Sovtek 2A3 sound is much better
than 2A3EH gold.even 2A3C is good sound to get and very clear and powerful.
Driver ECC88 and 6N1P are more clear and not too much bass but sound more musical.
and I am thinking ,going build up next circuit is ...
Perque Drive for SRPP how to work? I like 2A3 SE with SRPP drive. sound is very clear as you knew.
SRPP is good sound to get but low Gain and not enough to get sound when
listing all type Classic Music.however if use a u(mew)Drive SRPP to get
more gain than SRPP normal.1st time I used u(mew)Drive SRPP for 6550/KT88 SE.
u(mew) drive is a little bit more than gereral SRPP.some one said 29times.
SRPP general is 26 times.so u(mew)drive get a little bit more gain.this time I tryed
"Perque-drive" with triode and penthode combination valuve like a 6U8 and 6AN8.
result is very good and sound like SRPP and actually output sine wave is same
like SRPP output and much gain from Perque-Drive SRPP.
experiamented by Mr Tetsu Kimura and his nick
name is "Perque" (PERUKE). I don't know what meanning "Perque". so now I can drive
300B easy with SRPP.slightly need adjust value of cathode resistance of triode and penthode
for miner distortion or comfortable sound which do you favorit.
Perque-Drive is Next.
RCA 45 Single Ended Amplifier on Dic 2008
---- 2009 ------- Single ended amplifiers in my room -------
6EJ7 drived 2A3 SEon Oct 2009
Yaha Amplifier for Head phone Headphone Amplifiers
Introdusing from simple headphone amplifier to highend amplifiers
if would like to seehere
EL156(Chinese)/EH 6550/KT88 Single Ended Amplifer D.I.Y on 2009
I am doing to try to building up again an Amplifier EL156 Single Ended
but difficult get EL156 original.so I will use Chinese EL156.still
expensive in Japan.here to
71A Single Ended Amplifier Sound on 1st Sep 2013 ,SPl 91dB Speaker System at home
Horn Speaker System with 71A Single Ended Amplifier under ISO Tango XE20S on Aug 2013 from Chile
Rectifier Tubes charactor lists
are next Valuve Rectifire
Cin type or Lin type
Ef ----- If filaments
Max Plate Voltages Ep
Max Currents Ip
5.0 V 3 A
5.0 V 2.0 A
6.3 V 0.6 A
350 V max
5.0 V 2.0 A
5.0 V 1.9 A
5.0 V 2.0 A
5.0 V 2.0 A
5.0 V 2.0 A
Cin type or Lin type
Ef ----- If filaments
max Plate Voltages Ep
max currents Ip
5.0 V 2.0 A
5.0 V 2.0 A
6.3 V 0.6 A
6.3 V 1.0 A
5.0 V 2.0
450 V max
note:Golden Dragon 274B is very good tube but very difficult find good one
and original Golden Dragon 274B is face like 5U4G,black corted plate.physically just
same size of WE300B.many GD 274B has mecanical damege inside but sound is very
soft when I am using with 300B/2A3 Single Ended Amplifier.GD 274B is 3rd party.
but we can buy other side of Chinese 274B.I think these 274B is just like 5R4.
of course sound is very different.however 274B Golden Dragon with 2A3 SE and 300B
SE Amplifier made up good sound both Jazz and Classic.
Appe: Easy to made one limited diode for differential amplifier
some where in my amplifier using limited current diode.I think difficult to get
out of Japan and country side.1mA to 5mA current limitter can use 2SK30(Rank) FET
depend on rank of FET insted limited current diode. J-FET has original current like
some mA.2SK30 is around 1mA to 5mA depend on Rank of 2SK30.safix is Rank.and easy to
make one limited current diode with one of resistanse within 1K ohm.
please see next figure can help you when do you would like to make one.
http://www.single-ended.com information such as photographs and schematics that are posted
on the intellectual property,
transcription, prohibited the diversion. Take legal action if you use the information.
always connected PC's USB to line Amplifier.can recieve Internet Radio.so
very good to lesting Classic from europa and USA.
All circuit diagram(Skematic)are made from Bsch(QT)by Suigyodo Japan.
I am using profecional chassis for valuve amplifier by Takachi BOX Co Japan.
if do you have intersting on all about profecional metal box for electronics.
please see this site and you can get any kind of good termination of BOX.
Takachi BOX (Takachi Electronic Industrial Co.Ltd)-Special BOX- for Electronics.
All Music Data saved in Music Server and getting Data from AT HOME LAN
in my house by small LAN and Music
Sound getting from LAN(home network) and CDP,DAT and LP player
Sound source are getting from DAT and DAC under DAT, CDplayer. 2A3 Single ended Amplifier has 24bit DAC inside of Amplifier . one of source came from LAN
File server using samba and test server. 4 PC connected each other by LAN. 2 of Server is using old PC low spec.file server using Samba and fireFly for mp3.
firefly can be connect any type of smart-phone.small system but enough to use at home.so I can replay FLAC ,wav any type of format(codec).
if do you have any old PC at corner of your room.please try to use as file server.It's very good idea.it is very economic and does not need to buy new NAS server.
OS are Linux, free OS.even if do you have modern type of PC ,you can use as Music Server lile Vortexbox and Voyage .etc Ubuntu Stereo too
If there is a pc that you no longer use the obsolete in a corner of your room, then this can be used
You can make a Music server. It is also relatively easy. It does not introduce in detail here, but please bestowed the life of a second old PC with your memories.
Vortexbox ,Voyage MPD, Ubuntu Studio ,Dephile, Audio Phile Linux and
Any Linux distribution but if use Linux and will be use IDE type old PC ,can be use until Fedora core 4,Centos 4 with old kernel Linux.
almost fabrication date is around from 2006 can be install Vortexbox, Voyage MPD and AP linux.if can not install Music Server please try old Linux version.