tubes age 219
Date: Thu, 6 Aug 2009 09:41:48 -0700 (PDT)
Subject: [R-390] Line audio output problem and 6C4 RF tubes
<snip> Also when powered up, this one, on local audio, it made noise but was
deaf. Looking into the RF deck first I found all three of the 6C4's bad( only slight
deflection on the TV7. This worried me a bit so then each tube was removed
and tested. A couple of hours later (that is the time you wish that heaters
warmed up quicker!) all other tubes tested strong and with new 6C4's in place
it was working. I jokingly asked if it had taken a lightning hit! All of the 6C4's
looked to be of the same lot number and one could guess that lot had quality
problems but I still thought it strange. Any thoughts on this or is it one of those
unsolved mysteries that I should forget about now that it is working?
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Date: Thu, 6 Aug 2009 12:53:17 -0400
Subject: Re: [R-390] Line audio output problem and 6C4 RF tubes
A lot can have problems. I bought four Western Electric mini tubes at a fest
one time and found all four gassy. Close examination of the pinch off tip at the
top showed a possible gas leak. The manufacturing process was so
consistent (the ultimate goal of tube manufacturing) that they must have tested
ok at production, but all had a very slow leak.
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Date: Thu, 6 Aug 2009 12:58:36 -0500
Subject: Re: [R-390] Line audio output problem and 6C4 RF tubes
Many years ago, I had over two dozen 6AK5/5654 JAN General Electric tubes.
Every single one was shorted or gassy. They all had the same batch numbers.
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Date: Thu, 6 Aug 2009 22:21:18 +0000 (UTC)
Subject: Re: [R-390] Line audio output problem and 6C4 RF tubes
I bought from eBay 100 JAN 6AK6. Date code 1986. Every one gassy. I have a
friend that once quoted eBay as one big toilet bowl. Remember when buying
tubes or any other great deal, there is no such thing as a free lunch.
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Date: Fri, 7 Aug 2009 04:54:51 -0700 (PDT)
Subject: Re: [R-390] Line audio output problem and 6C4 RF tubes
>...two dozen 6AK5/5654 JAN General Electric tubes. Every single one was
shorted or gassy.....
(14 pages)
(10 pages)
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