71A/12A Compatible Single Ended Amplifier on Aug 2013
Let's me show you, 71A/12A Compatible Single Ended Amplifier on 14th July 2013
Modify 300B Single Ended Amplifier
Above schematic is 300B Single Ended Amplifier less than 10 components replace then get 300B SET
as 12A Single Ended Amplifier 0.2W rms
Back Side ,, RCA un balanced and USD 16bit 48Khz from PC
This time doing brew one of 71A/12A Compatible Single Ended Amplifier,this time start to use third party factory's transformer. Name of Factory is Noguchi Transformer CO Japan
recently they are making finemet audio transformer for valve amplifiers.this time using PMF-15WS Cut Core universal transformer.can be use for 300B,71A,2A3,45 etc.
even can be use for EL34 and KT88 Single Ended Amplifier.but only market is in Japan. Noguchi does not would like to sale out of Japan.but many good original audio transformers.
why I have to use Noguchi Transformer again,,because ISO Tango is broken company so we can not get from them.we have to use Tamura and Hashimoto(Sansui) for High End model.
charactor of PMF-15WS of Charactor and wiring of transformer actually Noguchi Transformer CO does not have one's factory.they order some famous transformer co in Japan.so they makes good transformer for Audio.Trust
only one thing they does not have any dealer out side of Japan.
sound is quite so nice sound ,this small output audio transformer is good and get good result.71A sound is very similar sound of 300B .
how about sound of 12A ? many spec said around 0.2 W rms ,this time I got 0.2 W rms but sound is very good ,much better than as 71A single ended amplifier.
if you can get 7K~10K ohm plate impedance audio transformer much better to use. I tested 91dB speaker with 0.2W 12A single ended amplifier.sound is more clear.
just I can not believe I am getting sound from 0.2 W power amplifier.enough to hear music at home sunday afternoon in small room.
Zenner diode using 3 serise 100V+100+20V = 220V and 0.5W of Diode.driver tubes are 6DJ8 family tubes so you can use E88CC JJ is Best.I recommended use this one.
first stages is EF86 ,please use E80F or EF806 , EF86 Philips etc.71A and 12A are vintage tubes so very difficult to get. please choose good one.
Comments from Owner of this Amplifier from Chile, AudioPhiler Mr A R Schweitzer
First conclusion: even if the 12A is a tube that surprises are able to display excellent sound with just 0.2 Watts of power, while trying to claim it distorts a little flat even in Coral 10.
I'll try another day max extensively modifying the feedback. Quickly I went to play with the 71A. It also seems incredible that 0.7 watts of music can fill a room. my living room is not that big but have something 6mx4m com.
The positioning of the instruments is large and forth from the speakers and probably wider than the listening space. The detail of the instruments is excellent, even better than in my 2A3.
The only thing I'm not sure who wins the 2A3 is in the voices, which have slightly less presence (maybe because it will be more balanced and everything sounds better in the 71A?)
I'm really happy with the amp. I have still much to experience.
on 25th Oct 2013:Note from MR Audiophiler from Chile in spanish
Finalmente me atrevi a comparar el Tatic con el Mizushima. Es imcreible la diferencia.
El Tatic ja sido mi pli de referencia por años y realmente el Mizushima hace todo mejor. Lo mas destacable es la claridad el Atzuko.
Es como comparar una foto de celular con la de una Canon 7D . Bueno, tal vez exagero un poco. El Tatic es un excelente amplificador,
pero con sus 0.7 watts, Atzuko lo supera en todo. Realmente lo mas divertivo es que mi opinion de los Coral Flat 10 camvio completamente y no necesitan ni mas agudos ni mas bajos.
Japanese explane 日本語での説明 Atsuko 71A/12A Compatible Single Ended Amplifier
71A/45/2A3 Compatible Single Ended Amplifier Allmande 2013
in Chile ,,,2013 Oct
Name of Miss Atsuko
Hatt Audio Lab Transformers just look like 3rd party of Tango but much better than Tango on 2014
Just last one of Tango XE20S 45/71A Compatible Single Ended Amplifier D.I.Y
Only circuit diagram is shown,and many components are using high end model. coupling capacitor are Audio Factory cupper film capacitor ,shizuki film capacitor,
ko-on denpa rotaly switch for impedance change of 16 and 8 ohms. signal line of resistor are AMRG ,ground wire and speaker connection wire from audio transformer are silver wire.
many parts of wiring are using OFC wire. power supply capacitor are using UNICON and Shizuki.power transformer is Noguchi PMC-170MR for 230V and XE20S by Tango.
some of resistance are Kiwame and REX. このアンプはタンゴ最後の新品1ペアのXE20Sで作られたアンプです。 ２０１３年6月上旬に春日無線のお店にワンペアあった在庫品でした。即購入ストックしました。
Schematic Diagram of 45/71A Single Ended Amplifier last product of ISO Tango XE-20S
Last one of XE20S Tango using 45/71A Single Ended Amplifier on Nov 2013///Just Testing Amplifier...
Just Show you,,,front ,back side and up side of this small watter Single Ended Amplifier using last one of Tango XE20S