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Questions about tubes and gear that glows. FAQ

Re: 5AR4 tube does not light up

With the 5ar4 out of the socket put an AC volts meter between pins 2 and 8 counting counter clockwise from the keyway, looking at the top of the socket. When you turn the amp on there will be no high DC voltage. There will be high AC voltage between pins 4 and 6. Stay away from those pins.

You should have 5vac the moment you switch on the power. Be careful. Never touch anything with both hands. Put one hand in your pocket.

Tre'
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