OTOMON 45/2A3/300B compatible amplifier pure class A1 (O. U. D. D. C) Zero NFB

OTOMON LAB 71A drive 45/2A3/300B compatible PP tube amplifier 20W power monoblock X 2 Zero NFB O. C This is absolutely the best amplifier that I have ever made, using O.

This is prototype product with all vintage HIrata TANGO transformer, driver transformer is Hashimoto. It can be used with 45/2A3 and 300B, max output as tube is 300B, at 20W. You can enjoy the different sound of 3 type of tubes in one amp. This is order made product that adopt new circuit.

And the result is as usual, really amazing. This amplifier is working in class A, double pushpull mode generate 20W of power for one channel. With Zero NFB, the response frequency is flatted from 20Hz to 40Khz, this is impossible to all amplifier that I made before.

At -1db it is from 10Hz to 80K Hz. The output power is 20W. Almost 300B PP tube amp generate 15-18W per channel. The sound as testing in our system is really good. The biggest characteristic of O.

C is that it bring a quite difference bass sound. Deep, open sound stage and detail. Specification (Zero NFB) Response frequency : 10Hz 80KHz (-1db) Flatted from 20Hz to 40Khz Hum level: 0.3mV THD : 5% 20W. Hybrid bias, you dont need to care any thing every time changing tube.

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