[R-390] R-390 6082 Question

[Jacques Fortin]

Bill,
May I comment that it depends on the tube tester....
"Mutual Conductance" testers (Hickock, Stark, etc.) sometimes provide very
different test results than a true transconductance tester (AVO VCM 163, for
ex.).
Same for leakage testing...

73, Jacques, VE2JFE

-----Message d'origine-----
De : r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] De
la part de Bill Riches
Envoyé : 30 mai 2017 18:20
À : hackmohr at myfairpoint.net; r-390 at mailman.qth.net
Objet : Re: [R-390] R-390 6082 Question

A tube tester is 100% able to let you know if the filament is good.  For
really trusting it to test all other functions its reliably is iffy at best!

73,

Bill, WA2DVU (A user of TT-1, TV-7 and others for testing tubes when I am
repairing gear!) Cape May, NJ 

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of hackmohr at myfairpoint.net
Sent: Tuesday, May 30, 2017 10:21 AM
To: r-390 at mailman.qth.net
Subject: [R-390] R-390 6082 Question

Hello All,

A question if you please. Is it likely (or even possible) for a tested good
6082 to still fail in the R-390 voltage regulator circuit? While working on
RF and IF alignments the voltage has suddenly gone high to 280V. I've
checked all 14 resistors in the VR circuit and they are all good. I've
swapped out both 5651 reference tubes and the 6BH6 amplifier tube with no
difference. I even moved all the tubes to a spare audio unit and it shows
the same high voltage. The only thing I haven't replaced is the 6082's which
both test good in the Hickok tester. I've ordered new ones but I feel like
I'm missing something. Any other possibiliites?

Mark WA2FXM
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