Part 8560-230 serial 082

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QRZ Forums. I recently came into possession of a Heathkit SB amplifier. Everything in it seems to be stock with the exception of the high voltage supply electrolytic capacitors. They've been replaced at some point, but I have no idea when. Looks like at least a decade ago. My questions are as follows: There is no grid protection circuitry. What type of resistor is being used here? Carbon film or similar? I'd like to do a good job preserving this amplifier and especially the tube!

Also, any hints or tips would be welcome. Thanks in advance, and 73 from AD5GG. Last edited: Mar 21,