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Vintage threads from the first ten years
Tuning calibrating of my valve tester?
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 4/30/2006 3:18 AM |
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| Satamax | Tuning calibrating of my valve tester? Hi everybody! Well, i've bought a valve tester http://satamax.free.fr/provavalvole.jpg I would like to understand more about it. How do i calibrate it? What test thoses ľA relate to? Isolation, or emission? Both? Could i improve it, to calculate the transconductance and other parameters, beside isolation and emission? Thanks and best regards. Max. |
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| 4/30/2006 5:33 AM |
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| Jack | Hi Max, Never seen that type of tester before, at a guess I would say it's an emission tester. I'm sure there's others on this forum who will pipe in soon with advice. If it's fairly old, I usually update the caps, check all resistors for drift, burn marks ect, clean all switches and sockets before putting it into service. See if you can download a schematic for it and check all voltages ect. Jack |
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| 4/30/2006 8:28 AM |
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| Satamax | Thanks a lot Jack! Well, it's an emission and shorts tester. There's very few components in there  About one diode, one or two resistors, the switches, and the multitap transformer I'll take a picture of the internals later.
Bye. Max. |
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| 4/30/2006 1:28 PM |
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John Culp |
If it's an emission and shorts tester, you can't test transconductance. You need a transconductance tester for that. |
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| 4/30/2006 3:12 PM |
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| Satamax | Thanks a lot John! Well, what brand of tested could i get cheap enough? I paid this one about 120 zoros, i'm keen on an AVO or a B&K , but realy i don't have the dough for one Therefor i thought i could may be modify or add components onto this one to be able to test and match valves.
Bye. Max. |
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| 4/30/2006 5:44 PM |
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| John Culp |
I just bought off of eBay for $90 plus shipping an EICO 666. It doesn't exactly measure transconductance, but that's pretty much what its "dynamic conductance" testing actually is. There's a good section on various tube testers to be found at: http://tone-lizard.com/ |
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