2A3PP tube amplifier. Driver tube 71A x 2. This adopted O.U.D.D.C and absolutely the best 2A3 push pull amp that I have ever made.

It is used product, there are some dirty, scratches on transformers

Original order price if you see this amp was sold out is 4850USD plus shipping fee, tubes are not included.

This is the first Pushpull amplifier that adopted O.U.D.D.C and it is better than any 2A3 PP that I have ever made. Output transformer up to 20W, Zero NFB, pure class A. This is impossible for any 2A3 PP amp that you see in market which has max 10-12w of output. The Harmonic distortion in this amp is only 3% at 15W and 5% at 20W.

This is new design of 2A3PP tube amplifier, using O.U.D.D.C schematic (Detail here > http://soundgate.net/product/MTQ1MA...highend ) is bringing the best sound ever for the amp.

Prestage tube is 12AY7 ( can be used with 12AT7, 12AU7, ECC82 ) x 1
Driver stage : 71A x 2
Ouput stage : 2A3 x 2
Rectifier tube : 5U4G. 5U4C, 5AR4, GZ34

Specification: (Zero NFB)

Response frequency: 16Hz ~ 100K Hz(-1db)
Hum level : 0.18mV
Distortion: 0.2% 1W 8Ω

Hybrid bias, you dont need to care any thing every time changing tube.

Tubes are not included
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