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RE: Stereo 35 R10 resistor question

Posted by xaudiomanx (A) on July 3, 2013 at 04:57:07

In Reply to: Stereo 35 R10 resistor question posted by jeffczar on July 2, 2013 at 22:53:13:

Before changing the R10 resistor because it is measuring improperly I would take it out of the circuit on one end and then measure it. Sometimes resistors measure improperly if they are in the circuit totally. Do that before trying to replace something that might not need to be replaced.

Now the red plate issue would be the output tubes are drawing too much current. The current draw is determined by the voltage on the plate and the resistor on the cathode as this is a cathode biased amp.

Are you using individual cathode resistors or combined? I think the combined of the output tube value of the resistor is 390R/5W and the individual is 180R/5w. 10W is better if you can fit them. Use a good quality noninductive type(Mills). Make sure you have a good ground connection to one side of the cathode resistor. If you are using a bypass cap on the resistor make sure they are oriented properly.

I know this may sound stupid but make sure your tubes are wired correctly. It seems suspicious that both channels are doing it.

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