This time doing re-build up only 2A3 single ended amplfier.but using all resistance
are Metal film resistance.as you know 3-4 type of resistace we can get commercial.
one of carbon resistace, wire wound resistance and Metal film resistance.same value
but each material makes very different sound will be get.carbon resistance are good for flat amplifier
even using power amplifier . as you know Metal oxicide film resistance are good for power amplifier.
will be get good bass and mid ,high is very bright sound.
this single amplifier is 2A3 single ended amplfier with 3 stages amplification.
EF86(triode mode) + ECC82/802/12AU7 + 2A3C/B and XE20S ISO Tango.
About resistance:
Most good resistance are Skelton in Japan and
Z201 Vishay resistance are very high cost but very good using High End Amplifier's.
used be use carbon resistance all parts of my amplifiers but
I will be back to Matal corting film resistance by Takman Electronics co Japan.
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.
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
今回は以前に失敗したシャーシの再利用で、前に製作した2A3シングルアンプを解体して再度 同じ部品を使って組み上げました。
変更部分は電圧メーターを外して、ドライバーを大分前に製作した形のEF86の3結にもどしました。