tubes age 169
The "3D" in your copy of my old post is the tilde character, meaning
"approximately". Most of those tubes can't be compared apples-to-apples from
the specs, as some are tabulated for a given plate current, others for a given
transconductance.
(It would be possible to get closer with many models of transconductance tube
tester.) I only meant to list all the ones I could find that would operate, with no
implication that they would do well. It seems odd to me that the 6DC6 is less
than abundant; it was made for TV's.
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Date: Tue, 07 Mar 2006 07:59:06 -0800
Subject: RE: [R-390] 6BJ6/6BH6 sub
Hi all, I'm back with a 6BJ6 in the 390 i.f. in place of the make-do 6BH6 sub that
I used for a week or so. Much thanks to the generousity of one of you for
sending me what I didn't have on hand.
The radio seemed to operate about the same with either the 6BJ6 or the 6BH6
(i.e. the signal I was listening to sounded the same) but I can't say I explored
any extreme situations that might reveal a difference with regard to agc action
and front end overload. But I'll accept the conventional wisdom and feel happy
that my 390 is now operating more like it was intended to operate, thanks all,
Dan.
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Date: Tue, 21 Mar 2006 08:13:48 -0500
Subject: [R-390] JAN vs JHS spec tubes, mixer specs, etc.
After buying some 6C4WA's recently, of course I found a huge stash (technically
measured as a "metric buttload") of 6C4W's and 6C4WA's in my crawlspace. I
probably bought them years ago and forgot about them. That's the nice thing
about chronic forgetfulness - every time I look somewhere I don't see everyday,
I'm pleasantly surprised by stuff that I had forgotten it even existed. It's like
Christmas year-round, and every day I get a new train set! Anyway, this stash
has the traditional mil-spec white boxes, but the tubes (Sylvanias) are labeled
twice (once in grey, once in green) and the boxes declare them to be "JHS"
instead of "JAN". Can someone remind me what JHS means? If I asked this a
few months ago when I last saw these boxes, you can remind me again, it'll be
like I never heard the answer first time around! <snip>...
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Date: Thu, 23 Mar 2006 07:50:50 -0500
Subject: [R-390] Random tube sub of the day: 6AU6 for 6BA6
(14 pages)
(10 pages)
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