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RE: update on web search

FWIW, vintage tube amps and receivers with a headphone jack had a problem similar to yours; how to load the amp when the headphones were connected thru a dropping resistor of ~ 200-500 ohms - essentially open circuit. Typically they inserted a 25-50 ohm resistor across the output when the headphones were plugged in. I would expect a load in this range of values would be a reasonable starting point, esp if your amps are inherently stable.


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