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We can provide power transformer which use for 117V, 220V, 230V, 240V.
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[Prototype SALE] OTOMON LAB LS-7 drive 45/2A3/300B compatible tube amplifier monoblock 7.5W power Zero NFB (O.U.D.D.C)

OTOMON LAB 71A drive 45/2A3/300B compatible tube amplifier monoblock 7.5W power Zero NFB (O.U.D.D.C)

This is order made product that adopt new circuit O.U.D.D.C, and the result is really amazing in low frequency.

This is prototype version, if you order the same one, all transformer will be new TANGO(ISO) transformers.

Price for order made is 3350USD, the prototype version used all Hirata TANGO transformers. All transformers are vintage ones and it has scraches, dust and rust but function is guranteed.








With Zero NFB, the response frequency is flatted from 30Hz to 25Khz, this is impossible to all amplifier that I made before. At -1db it is from 16Hz to 40K Hz.

The output power is 7W with 300B tube. 6W with 2A3 tube and 3W for 45 tube.

The sound as testing in our system is really good. The biggest characteristic of O.U.D.D.C is that it bring a quite difference bass sound. Deep, open sound stage and detail.



Tubes using in this amplifier
Prestage tube : REN904
Driver tube : LS-7 (CV-1660)
Rectifier tube : 5R4GW


This is no NFB tube amp

Specification (Zero NFB)

Response frequency : 16Hz ~ 40KHz (-1db) Flatted from 30Hz to 25Khz
Hum level: 0.3mV
THD : 5% 7W
  • Special order made
  • NEW
$2,350.00
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[Prototype SALE] OTOMON LAB LS-7 drive 45/2A3/300B compatible  tube amplifier monoblock 7.5W power Zero NFB (O.U.D.D.C)

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