WE 300B Single Ended Amplifier D.I.Y

this counter started 1st Mar 2012

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Real Audiophile no use Push Pull Amplifier
WE 300B Single Ended Amplifier with James JS 6123HS

If would like to build up good amplifier please use Japanese Audio Transformer.

Much better use Japanese Transformer of waste of money for buy cheap Chinese Transformer

This counter started on 1st June 2015

Version　Japanese

Western Electric WE300B

WE300B is only Western Electric not from China

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Takumi 300B on 2021 in Lampa Chile

Plays Tomomi Concertiste Mizushima 300B Single Ended Amplifier

easy build up CD type RIAA for Record player LP

hifiberry and 300B Single Ended Amplifier on 2020 lampa chile

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WE 300B Single Ended Amplifier with James Transformer

Schematic is next, very clear sound and more powerfull sound I am getting.
casuse of 3 Stages Amplifier.from low frequency to high response are so nice.
I am using FE86 philips old type of FE86 with mesh plate for input line.
in generaly I am using for Main Amplifier at home from 2004.2 stage of 300B SE
with SRPP drive is a little bit difficult push low efficiency speaker like a my
System NS 300(90db/m/w).but this type of 3 stage amplifier is easy to push
low range.I like 300B with James JS-6123HS. Built up early 2004.
Actually ,,still using this 300B Single Ended Amplifier ,,EF83 + 6N1P + 300B EH ..enough ..good bass and mid and high is very clear.
and position of load impedance is 2.5K and I connected 6 ohms speaker 91dB/m/w so equivalent load impedance is around 2.7K ohms.
plate voltages 420V respecto with ground. coupling capacitor are Del Ritmo Vita Q ,low cost capacitor but getting sound very natural.
Max Power is 8 W rms.nominal power is around 7 W rms. much better than 2A3 but I like 2A3 sound from medium Efficiency speaker system.
Note: Single-ended amplifiers have low output power and require high efficiency speakers.
The efficiency must be at least 91dB/m/w. A full range of 96dB/m/w or better is good.
Some people use a horn type speaker with 100 dB/m/w. Choose high efficiency speakers instead of expensive ones.

300B Single Ended Amplifier with James JS6123HS

please comparare with some Tango Transformer,James Transformer is narrow BW

tranformer terminal are assigned counter clockwise.so easily find which is primary and secondary.

Why Japanese Transformer are good !!!! much wide than any transoformer :FE12 Tango

This is H20-3.5U semi universal audio transformer USD $ 600 dollars pair

PMF15WS Budget Transformer Noguchi USD $ 230 dollars pair

>

James's band width is not wide range, please compare with ISO Tango Transformers.
price is almost same as XE20S but technology does not reach level of ISO Tango Transformers.
if would like to buy James Transformer please see Tango XE-20S and Hashimoto Transformers,
much better for use single ended Amplifier.even FE-12S ISO Tango is good transformer.
often using Touei Transformer for Test and Kasuga Transformer too and budget transformer.
charactor are not so bad,both are small transformer maker.but get good quiality product.
one thing only making small power transformer.

this time a little bit change few things then changed upgrade sound getting with JS-6123HS.
choose 2.5K ohm impedance much better than before.not so bad sound getting from 300B SE.

Recommended Audio Transformer for 300B Single Ended Amplifier:

ISO Tango :FC-30-3.5S,XE-20S,U-808,FE12S,S-2595(40W 2.7K),S-2197(20W 1.5K)=FE-20-1.5S）,(Tango are change impedance
secondary tap for universal transformer.a couple years ago quite.but 2016 started again.

Tamura : F-2007,F-5002,F-7002,are almost max 8W and high price.F-5002 is good.
Recently Tamura has new line fpr Single ended amplifier.each one 's weight is 5 Kg.very heavy.
: F913、F912 and F915 are new .very reasonable price but max power is only 8 W.
Hashimoto : H-30-3.5S,H-20-3.5U(2.5K/3.5K 20W)(Hashimoto's transformer are change impedance at primary)
and
Noguchi Transformer.Noguchi does not have factory but big company made for Noguchi.PFM-15WS (15W)is good.
very nice transformer for single ended amplifier.
300B Spec

WE300B Single Ended Spec table

EH 300B SE and 24 bit DAC on 1st Mar 2012

Then next circuit is version up circuit on Jan 2012
first stage is ECC82(Ecc802S),12AU7 and 2nd stage es 6N1P or ECC88 then 300B.
much better sound getting from 300B. future I would like to replace other MFG Audio Transformer.

I did small up date of my old 300B single ended Amplifier.
frequency response is 20Hz to 75Khz at -1dB non NFB and 20Hz to 85Khz at -1dB with 5dB NFB.
sound is not so bad than before,more clear and good frequency response which using 2.5K .
Power is 7 W rms. must be use fix bias for more power.but 300B tubes are expensive so
does not need much voltages and power for one's pocket money.that's enough.
some day I will try fixed bias for this 300B single ended amplifier.
coupling capacitor are using Tone Factory Vita Q paper oil capacitor.
sound is very good clear tone from Tone Factory Vita Q.I recommended to use single ended amplifier.
this amplifier using KOA resistance.will be replace AMRS resistace at all.
AMRS

resistance AMRS are good and good C/P has.just quater of price of AMRG but sound are very good.
there are carbon corted resistance.AMRG is also carbon and surface around tube of alminum then
corted by carbon painted. sound is very good low to high range.AMRG is about USD $ 3.0 dollars
in Japan slightly expensive resistor.AMRS is USD $0.6 dollars in Japan.
economy but sound is just same as AMRG.what kind of resistance is good ? Skelton and
Z201 Vishay resistance are very high cost but very good.

all signal resistor are replaced with AMRS and some parts is AMRG.
so what is matter with this amplifier sound ? very clear sound and female voice is
more feminin like and Pianos touch is very real now.this is carbon resistance sound.
But does not get low ranges, this is world of audio.sound is very clear but does not get low.
I will be back to Matal corting film resistance by Takman Electronics co Japan.
TDO Metal

Takman Matal film Resistance(REY) by Takman and web site is Takman Electronics Co Japan
show above picture is Takman resistance, very budget resistance but sound is best for me.
to get much low range and mid /high is so sweet sound.REX and REY are for Audio 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.
REX and REY resistance Takman

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

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