tubes age 167
overall). Well, looking through my R-390A's that probably never had anything but
mil-spec JAN tubes in them their whole lives I see plenty of heat-damaged
plate resistors in them that indicate past possible tube problems. Worst case
"cardiac arrest" is probably a short that causes so much current in a
transformer or choke and kills it. Resistors and most tubes still seem plentiful
enough, and there doesn't seem a lot of dire shortage of most of a 390A's
chokes or transformers although I'm certain that there are some that are harder
to find than others. Most (but not all) 390A's have fusing that will prevent the
worst many "cardiac arrest - choke fire" cases. (Strangely enough many of the
nicer looking ones on E-pay do not have the fusing installed... MARS units that
didn't see military use/depot service?)
> p.s. Is Tim trying to give a plug for Triode Electronics? .......
While I've bought stuff from Triode Electroncis with great success in the past, I
am certainly not trying to push them as a source for tubes... I've had pretty good
luck getting US/Euro JAN tubes much cheaper at hamfests or even the (I swore
I would never talk about it) E-place.
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Date: Fri, 17 Feb 2006 09:18:55 -0500
Subject: Re: [R-390] "Fake" 12AX7 tubes on e*pay
I don't have experience with 6L6 types but I can tell a story about EL34's, or
E34L's actually: A friend of mine has a Dynaco Stereo 70 and we retubed it with
Tesla E34L's. He had the bottom cover loose and that shorted the bias to one
set of tubes. While listening to the thing, he noticed the plates glowing rather
strongly red. We don't know how long they's run that way. Immediate shutdown
was followed by re-testing of tubes and bias and so on. The tubes tested
exactly as they had upon installation and have been running just fine ever
since. My suggestion: if you can get any Tesla 6L6GC type tube for affordable
prices, do it. Beat the devil out of them and report your experience.
---------------------------------------------------------------------------------------------------------
Date: Fri, 17 Feb 2006 07:42:59 -0700
Subject: Re: [R-390] "Fake" 12AX7 tubes on e*pay
I needed a couple of 7027's for a couple of old Globe Scout's I'm rebuilding-
found some Chinese 6L6GC's cheap and will try them- have some SOvtek also
so will do some comparison.
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Date: Fri, 17 Feb 2006 10:14:46 -0500
Subject: Re: [R-390] "Fake" 12AX7 tubes on e*pay
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