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Questions about tubes and gear that glows. FAQ

RE: my bias is running away on one side even with the bias backed all the way off on that side!

The black 540 with silver stripe are "diodes". You're DVM should have a diode check option so you can recheck those with it. Negative probe goes to the silver stripe side. You should get a reading. Reversing the DVM leads should read infinite. Do this to both diodes and see how they compare.

If the Jensen cap had the wires unscrewed when tested, then indeed it is bad. BUT, replace it with a cheap cap first to see if that was the problem. So if you order a replacement Jensen, also order another cap or two of something less exotic to try first. Don't want to ruin a new Jensen.

Electrolytic caps should last about 20 years. Depending on age, you may wish to replace them all.

I've provided a link for an on-line resistor calculator as a quick was to determine values when only color bands are present on the resistor. I couldn't find the one I normally use, but this one looks ok.



"I know just enough to get into trouble. But not enough to get out of it."

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