• 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.

rogers cadet opt replacement

I think the answer will be the same as previously mentioned.
rogers cadet

Without test gear trial and error. Reduce the value of the resistor used for 15 ohm (6.8k). Try 100pF to 390pF in parallel.


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2018-04-17 6:50 pm
Worth compensating when going from 15 to 4 ohm, but going from 15 to 8 is not worth losing sleep over.

It can do no harm to your amplifier if you experiment in the way that's previously been suggested. Simply adjust for best audible result.