OTOMON LAB 71A drive 71A/45/2A3 compatible tube amplifier Dual monoblock All DHT tube Zero NFB (O.U.D.D.C)

If you saw this one was sold out, price to order the same one is 2350USD. This is prototype version so I use vintage Luxman and Tamura transformers, in the new order made item, transformers will be ISO (TANGO). Input voltage can be changed to 117V or 230V.

Rectifier tube is 83 or 80 tube.

DHT is Direct heat tube, which brings a very special sound, but in the oposite site, it is very easy to get hum so make an amp with all DHT tube is very very difficult.

This amplifier use DHT 71A tube driver 2A3 tube with O.U.D.D.C.

The hum level is 0.1mV. unbelievable level. Input transformer is Tamura, you can choose impedance 300ohm, 600ohm or 10K ohm to match with your preamp output.

Sound is very sweet and rich. It is much better than using prestage tube 396A or 417A as I did before. But the gain is little low and you should use it with preamp to get the best performance.

Generally, 2A3 gerenrate 2-4W of power but with this special circus, amplifier reach 5.3W at 5% THD.

This is product adopted new circuit O.U.D.D.C, and the result is as usual, really amazing.