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Tube tester shenanigans
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Topic: Tube tester shenanigans (Read 929 times)
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CoopedUp
Regular Contributor
Posts: 107
Tube tester shenanigans
«
on:
July 02, 2019, 05:30:32 pm »
My tube tester works just fine with some tubes and others the needle just gets pinned in the wrong direction. Anyone know what this means? Is the tube on the inside of the tester cooked? Thanks
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Cubdriver
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Posts: 4201
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Nixie addict
Re: Tube tester shenanigans
«
Reply #1 on:
July 02, 2019, 09:02:45 pm »
A bit of additional detail would help to get you an answer.
Little things:
What make/model of tube tester?
What tubes does it work fine with?
What tubes does it not work with?
Does it sometimes work and not work with different specimens of the same tube type?
-Pat
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If it jams, force it. If it breaks, you needed a new one anyway...
CoopedUp
Regular Contributor
Posts: 107
Re: Tube tester shenanigans
«
Reply #2 on:
July 03, 2019, 12:16:15 am »
It's a mercury 1000 and it works with all the diodes I have put in it and I haven't tested a whole lot else but half of everything that is different like the all American fives I think the 50c 5and 35w4 work but none of the others 12ba6 12be6 or 12av6 at least that's the way I remember it not working
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floobydust
Super Contributor
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Re: Tube tester shenanigans
«
Reply #3 on:
July 03, 2019, 03:08:03 am »
When's the last time you calibrated it?
I would see if the tester's bias supply is working and calibrated at -5.9V, along with setting the
four
other cal trimpots. There are only four electrolytic caps, I would replace them given the age.
«
Last Edit: July 03, 2019, 04:21:40 am by floobydust
»
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CoopedUp
Regular Contributor
Posts: 107
Re: Tube tester shenanigans
«
Reply #4 on:
July 04, 2019, 03:00:15 pm »
I have replaced all of the capacitors already, and I don't know when it was last calibrated but I don't see how that would affect the pin going the incorrect direction
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