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valve glow...when is too much?


Thunderpaws
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It depends on where it's orange. The heater in the core is OK to be orange. The black jacket around the core shouldn't be orange, that indicates it's lost its vacuum seal. It's nearly impossible to test tubes. It used to be every corner drugstore had a tube tester and sold tubes, but they're long gone now.

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2 minutes ago, Bill Fitzmaurice said:

It depends on where it's orange. The heater in the core is OK to be orange. The black jacket around the core shouldn't be orange, that indicates it's lost its vacuum seal. It's nearly impossible to test tubes. It used to be every corner drugstore had a tube tester and sold tubes, but they're long gone now.

Very true, but the kit they used now very regularly turns up on eBay for pennies. Might not be worth it to test a single valve but an interesting thing for an enthusiast to have anyway.

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