tubes age 74
pull some of my spare tubes. I know that I do have some labeled with the GB, I
just don't remember which company it was.
>Also, I can't find any references on these tubes: 7984 and 8233. Can
>somebody let me know what these were used for?
I don't have the manuals handy. The 7894 doesn't ring a bell. I've got a couple
of things that use that tube number. The 8233 was used in the little 100W
military RF amp for the T-827 series of transmitters. It is also used in one of the
Tektronix vertical amplifier plug in's for my old 564B storage scope. It's an
overkill tube for a ten MHz scope.
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Date: Mon, 27 Aug 2001 21:03:10 -0500
Subject: Re: [R-390] Tube questions
>and noticed that the GB tubes are Sylvania Gold Brand................
That's it! :-)
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Date: Mon, 10 Sep 2001 14:44:08 -0700
Subject: RE: [R-390] 390a 6360 audio
> ...I have a lot of 6DJ8's ......I never looked those up as subs for
anything..............
Tek 500-series scopes use a lot of 6DJ8s. Tek started out with 6BQ7s, ran into
reliability problems, and canned every last one. I only have one thing that uses
a 6AH6: a TS-810/U marker generator.
> I'm using 6J6's in the 2nd and 3rd mixers, and 12AT7's for the 5814's in the
AF deck. The 12AT7 is supposed to be quieter than the 12AX7. The audio
crowd just about worships the 12AX7, so prices are jacked up.
Are those 12AT7s working ok for you? My set turned out to have one in V601,
and I traced some strong-signal audio distortion to there. The 12AT7 was
biased at a very low operating point because its mµ is higher than the 5814's,
and it was cutting off on the negative peaks from the detector. If the 6AH6
makes a decent sub for V603/V604, I'd like to know. I have several lying around,
and no spare 6AK6's.
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Date: Mon, 10 Sep 2001 19:53:43 +0000
Subject: Re: [R-390] 390a 6360 audio
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