This kind of Power Amplifier necesary to use good efficients speaker system. SPL is over 90dB/m/w
need.so 90dB means minimam sensibity of speaker driver. 2A3's nominal power are 3.5W rms.
but recently new type of 2A3 are not 3.5W rms power.Nominal power is 4.5 W and more power get.
some technic can do solution more than 4.5W rms,probably will be get 6-7 W rms Power.
please use from 90dB/w/m to 98dB/w/m speakers.even small power single ended amplifier means
low efficiency speaker does not play Music.like 86dB/w/m 88dB/w/m Speaker. this is very important things for
Single Ended Amplifier Users.
Transformer using ISO Transformer Tokyo FC-12S (FE-12S ex ISO Tango)
2A3/45 Singe Ended Amplifier
Schematic diagram for 2A3/45 Single Ended Amplifier High Voltage version
first circuit of Perche drive 2A3/45 single ended amplifier on 2009
This type of amplifier
built up few times before
and this time is same circuit and same combination of physical parts using.
Driver is using 6BL8 or E80CF(europian).circuit is very simple, we call it's
Perche Drive(Mr Tetsu Kimura Tested and get good result)
Perche is good response and even getting good frequency respose when if using
good audio transformer.ISO Tango are good frequency resonse.
Just remake of perche drive 2A3/45 single ended amplifier.
now start to brew(remake),
chassis is a little a bit large than before.same chassis of 3 stages 2A3 single
ended amplifier.SRDSL-9HS(Silver) is real name of chassis by Takachi box Japan.
size is 205mm x 45mm x 400mm.
Audio Transformer are 2 of FE-12S ISO Tango.
2 line of high input impedance.can be use both of 45 and 2A3.
if would like to use Emission lab 45 nothing problem to use.offcourse
can use RCA 45 too.2A3 is RCA 2A3 is not recomendable to use.you can use new type
2A3 by JJ,Sovtek ,China and 2A3C , 2A3B by China NGG etc.specialy good for
Sovtek 2A3,EH 2A3 and China NGG 2A3C and 2A3B.
Power Transformer is Noguchi Transformer Japan PMC-170M.
special for 2A3 single ended Amplifier.can use only 100V AC 50Hz.
Chork Transformer is Noguchi Transformer PMC-518(5H 180mA).
signal line of resistance are AMRG by AMTRANS Japan.AMRG is low noise and
low distortion non inductive carbon resistance.large type resistance are Kiwame.
electric capacitor are almost Nichikon.Coupling capacitor are
2 of Cornell Dubilier Black Cat. Black Cat has good response from low to high.
super good capacitor from USA.block condensor is UNICON for Audio use.
Cathode resistance are Kiwame(5W) and Dale(10W) non inductive resisistance.
>Power transformer is PMC170M Noguchi Transformer but not avarable in over sea.
any my single ended 2A3 and 300B amplifier using PMC170M for power supply.
but also if would like to get similar power transformer ,you can use PT-160V(for 220V)
Hashimoto Transformer instead PMC170M.
Rectifire valve can be use 5U4GB,5R4,5R4G
Sound of 2A3C anf 2A3 Sovtek when using High voltage :
Soundding of 2A3C and Sovtek 2A3 are very tight and very tired when lesting long time. sound is not
so bad but sound is tight. felt low distortion when choose 3.5K ohm but much better use 2.5K ohm
for me.power getting more than 6 W rms easily. I prefer use low plate voltage as 2A3(RCA)condition.
these tubes are not use for high voltages.305V plate voltages and 2.5K OHM get good sound.
and I got good result with 6U8 .6U8 made good sounding with perche drive.
low plate voltage is much more real 2A3 sound getting
Spec: Power is 4.0 W rms max 4.8W rms by 2A3 and RCA 45 is 1.6W rms.
frequency response is 20Hz --- 80Khz -1dB non NFB at 0.5W
20Hz --- 100Khz -2dB NFB at 0.5W
DF is 2.5 by -2dB NFB.sound is very clear and very powerfull with Sovtek 2A3.
As RCA 45 Single Ended Amplifier on oct 2011
Horn with 245 Single Ended Amplifier Porco Rosso on 2012 Aug
Started from OCT 2016 as ISO TRANSFORMERS CO Japan
they have FC-20S instead of XE20S only name of transformer is different.and Name of company is no more TANGO.
New company re-started by ex employee of ISO TANGO.real new company of ex ISO TANGO.and New Name of company is
ISO TRANSFORMERS CO JAPAN.
And Perche Drive 2A3 using FE-12S of ISO TANGO and now you can use FC-12S from ISO Transformers Co Japan.small transformer but can be use for 2A3,300B and any
small Penthode Single Ended Amplifier.
Single Ended Amplifier D.I.Y
How to build up Amplifier Single Ended Amplifier 2011-2017