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Junm 28th June 2019 04:17 PM

What tubes are used?
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Hi does somebody recognizes this monoblock PP amp? Donít know the tubes that were used. Somebody might help me out with the schematics. With 8k 10w output and directly heated tubes with input trafo.

petertub 28th June 2019 04:22 PM

My crystal ball has crashed, thus i cannot tell what amp it is. A picture might be advantageous ...

Junm 28th June 2019 04:25 PM

Sorry just had trouble uploading photos

TheGimp 28th June 2019 04:32 PM

Start tracing the circuit from the Sansui output transformer back. Post the schematic.

Search for the Sansui output transformer number. If you find it used in another amp, or find data on it it will help identify possible tubes.

There is a lot of information to be gained from the bottom of the OPT. Does it specify two tube connections and one B+? If so, it is 8Kp-p for push pull operation.

4 Pin output tubes, 5V and 6.3V filament supplies, not 2A3.

Junm 28th June 2019 04:39 PM

I dont have the actual unit yet so i just looking at the sent photos. As I see it has pp output with 2 4 pin tubes and 5 pins predrivers plus a 4 pin tube rectifier with 5 v filament.

Eli Duttman 28th June 2019 07:01 PM

The power trafo suggests the 125 mA. capable, 5Y3 equivalent, #80 as the rectifier.

The unit is obviously DIY and the schematic will have to be worked out by tracing.

Sansui used Hashimoto "iron".

BTW, that power trafo strikes me as being puny. Where is the filament current for DHT "finals"?

The #27 IDHT is possible in the small signal positions. However, the power trafo can't provide enough 6.3 VAC current for a pair.

Wavebourn 29th June 2019 12:29 AM

Japanese DIY amp?
I would ask this guy: Kanbo Yoshiba | Facebook

HollowState 29th June 2019 01:38 AM

The amp is definitely push pull and I would guess 6B4G or 6A3 for the outputs. Both are very similar. For the rectifier either an 80, 5Z3, 274A, perhaps even an 83 although unlikely.

TonyTecson 29th June 2019 01:50 AM

i saw that being peddled locally, is that a single block Jun?

jazbo8 29th June 2019 03:47 AM


Originally Posted by Eli Duttman (
Sansei used Hashimoto "iron".

I thought Hashimoto was started by ex-Sansui employees... :)

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