• 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 opt need help

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robertc said:
i got a pair of tamura pp opt 100 watt with 2 terminals feedback marked cf1 & cf2. can anyone tell me how to use these feedback for pp kt88 power amp.thanks.

I think you have a set of OPTs with cathode feedback taps; basically windings intended to apply negative feedback by being placed in series with the cathodes of the output valves.

If I'm right, you'll have to place them in series with the cathodes of the output stages.

Do you have a model number on the OPTs?
 
CF

This way
 

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