• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tamura F-2012

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Does anybody have a datasheet for the Tamura F-2012? I've tried looking all over the 'net and can find no detailed info.

Or, at least, does anybody know what the turns/impedance ratio to the cathode FB winding is?

I know I can measure it, but I'd prefer to have the manufacturer's datasheet... Japanese language is fine.

TIA!

Pete
 

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Joined 2008
Does anybody have a datasheet for the Tamura F-2012? I've tried looking all over the 'net and can find no detailed info.

Or, at least, does anybody know what the turns/impedance ratio to the cathode FB winding is?

I know I can measure it, but I'd prefer to have the manufacturer's datasheet... Japanese language is fine.

TIA!

Pete

The cathode feedback winding should be 16R as for other Tamura transformers. This means, for example, that for class AB operation the effective load seen by each tube will be [ SQRT(1250) + SQRT(16) ]^2 = 1548 ohms and the beta will be SQRT (16/1548) = 0.102 (or 10.2%) if you have two cathode windings.
 
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