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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: tube warmup indicator posted by tesla on April 21, 2017 at 21:30:14:
The amps. I build use a neon high voltage indicator, run on DC with a resistor in series. But it's only good for tube rectifiers that warm up slowly. A SS power supply will come up to voltage instantly, which in turn lights the neon instantly.
If you ran some cathode current through an opto-isolator, it would bias on the LED once the tube started conducting. Then the opto resistor can be connected in series with an LED to slowly light it up. But that requires some engineering.
You can 'fake' it as well by using a timer circuit that corresponds with the warm up time, then light an LED once the timer has timed out.
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Follow Ups
- RE: tube warmup indicator - Audio Pete 13:42:20 05/25/17 (0)
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