tubes age 52
synthetic motor oil for the primary lubricant has proven to be a winner. It's
easier to tune today than it was two years ago. I spent a hell of a lot more time
checking everything when I put it back together than I probably needed to. But
all in all, it was well worth it to me and I think that it was effort well spend. For
what it's worth, I just checked the log on one of the R-1051B's and it's been
running 24/7 since October 8, 1996. That's well over 35,000 hours. I cheat on
them though and replace both of the tubes in each one every 6 months without
even bothering to check them.
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Date: Fri, 3 Nov 2000 08:02:16 -0800 (PST)
Subject: Re: [R-390] Tube reference
The best if you can find a copy is (was?) something called "Electronic Universal
Vade-Mecum" a HUGE book about 600 pages of data sheets and pin outs.
Next, I think would be the RCA tube handbooks of HB-3 series, if you can find a
complete set,(I have two incomplete sets, but am only missing stuff like
phototube, and watercooled, so no real harm.)
Others, Of course "Tube Lore"by Ludwell Sibley, a rather new one is,
SAMS/Prompt's "Tube Substitution Handbook", I think it's only a year or two old
in the current version.
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Date: Fri, 15 Dec 2000 17:45:38 -0600
Subject: [R-390] 12AU7 and 12AU7A tubes
A friend of mine just gave me about 20, new in the box, 12AU7A's. Are these the
same as the 12AU7's? If not, how do they differ? If they can be used, would I
have to change all the 12AU7's to 12AU7A's in my 390A?
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Date: Fri, 15 Dec 2000 18:52:49 EST
Subject: Re: [R-390] 12AU7 and 12AU7A tubes
The suffix designators are.........A = quick heating elements, many times you will
see for example.12AU7WA..... this means ruggedized with quick heating
elements. This was a JAN (Joint-Army Navy ) designator.
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