Harman Kardon Output Balance Potentiometers
- Thread starter rudes
- Start date
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Unless someone knows of an exact replacement, you'll probably have to improvise with something like this:
https://www.tubesandmore.com/products/potentiometer-100-linear-knurled-5w-wirewound-24mm
Or this:
https://www.surplussales.com/Potentiometers/PBM-Shafted/PBM-Shafted-1.html
There are a few other pots at the surplus site link that might work. I don't know the wattage required for this pot, but it can be calculated. You might need to use a 100 ohm and bridge it with a 100 ohm fixed resistor. That would reduce the dissipation of the pot. I would be wary of used parts unless they can be returned.
Jack
https://www.tubesandmore.com/products/potentiometer-100-linear-knurled-5w-wirewound-24mm
Or this:
https://www.surplussales.com/Potentiometers/PBM-Shafted/PBM-Shafted-1.html
There are a few other pots at the surplus site link that might work. I don't know the wattage required for this pot, but it can be calculated. You might need to use a 100 ohm and bridge it with a 100 ohm fixed resistor. That would reduce the dissipation of the pot. I would be wary of used parts unless they can be returned.
Jack
Got the full schematic? If you change the pot from a 50 to a 100, fair bet there is a resistor someplace that needs tweaking in order to make up for the difference. I don't remember if this particular model runs tube heaters as the cathode resistor or not. If it does, that might be a problem.
