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RE: Tube Power Amp Not Working - Help?

Posted by TubeAcolyte (D) on September 6, 2015 at 06:52:59

In Reply to: Tube Power Amp Not Working - Help? posted by capone on September 5, 2015 at 19:27:47:

Well, I know little about your amp, but there are some basic things you could check.

I tried looking for a schematic, but no dice. That makes it a lot easier to direct you through checking some things with your volt meter...

Well, either way, I'd check if you have any B+ reaching your tubes, and see if there's maybe a high-tension fuse inside the amp that's gone. The fact your 5AR4's don't glow isn't a huge concern, but they should still at least a little - they have a heater wire like any other tube.

To check the B+, I just take out my main power tubes, connect the red lead into the pin connected to the tube's plate, and then the black lead to the best relevant ground (could be chassis, but largely depends on circuit). When you turn on the amp, and off standby, you should see B+ voltage of a few hundred volts.

If you don't have B+, bring it in to a tech.


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May your tubes be lively, warm, and long-lasting. Holy be thy heater.

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