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  #1  
Old 04-03-2018, 09:02 PM
Wind157 Wind157 is offline
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Tube question

Think I found my trouble. Does a 1b3gt tube have any visible glow?
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Old 04-03-2018, 09:48 PM
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Kevin Kuehn Kevin Kuehn is offline
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It's very difficult to see it glow.
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Old 04-03-2018, 10:09 PM
Wind157 Wind157 is offline
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Darn, thought I found my problem but it's the X-ray tube so guess I wouldn't see it.
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Old 04-04-2018, 08:27 AM
zeno zeno is offline
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HV rectifier tubes rarely glow or just have a slight glow. It
dont take much heat to get the electron to make the jump
at HV. Best quick test is:
Unplug the top cap & let it hang away from metal.
Take a GOOD well insulated screwdriver & get it near the metal
of the cap. You should get a healthy apx 1/2 inch arc.
If not its the horz osc, output or damper IF its a tube.

73 Zeno
LFOD !
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Old 04-04-2018, 12:02 PM
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benman94 benman94 is offline
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If a 1B3 is gassy, it will often light up a bright pink, sometimes violet, depending on the identity of the intruding gas.
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