tubes age 145
an outfit called "The Triode Store" but I haven't looked at what else they have
lately.
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Date: Sat, 9 Jul 2005 22:20:16 EDT
Subject: Re: [R-390] Ceramic sockets or not?
I would install the ceramics you have and get on with enjoying your radio. Like
you say they are for high heat locations. But why not use them, they could
outlast the rest of the receiver.
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Date: Sat, 30 Jul 2005 20:32:25 -0400
Subject: [R-390] Sub 6AU6 for 6BA6?
In several places (notably VFO and BFO oscillators) in a cow-orkers R-390A, I
notice that there's 6AU6's instead of 6BA6's. I know that the 6AU6 is a sharp
cutoff pentode, and the 6BA6 is a remote cutoff pentode, and suspect that in an
amp (especially AGC-controlled amp) or mixer that there'd be some change in
dynamic range/AGC characteristics through such a substitution which may not
be good. But in a simple oscillator, does it make much if any difference? (I
know that probably the VFO has to have its endpoint adjusted, but that's true
even when putting in a different 6BA6 so is "no big deal").
I grew up on Heath Collins Drake etc. gear of the 60's and early 70's (how late
did the make the HW-101? Into the 80's?) that used lotsa 6AU6's (sometimes
12AU6's) for just about everything it seemed like :-). Tim.
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Date: Thu, 4 Aug 2005 21:17:22 -0700
Subject: [R-390] Need straight poop on 6C4
I've got a 6C4 going soft in the RF section of my R-390A. The Y2K manual
shows to use a JAN-6C4W, another source states to use a 6C4WA, the 6C4W
will not work, the 6C4 will work but not quite as well. So, need the straight poop,
which 6C4 is the real deal? Got a guy 20 minutes down the road with a house
full of tubes to sell.
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Date: Fri, 5 Aug 2005 09:15:58 -0600
Subject: RE: [R-390] Need straight poop on 6C4
I have milspec 6C4's brand new sealed in their as issued box's these are the
one's called for in the original parts list for the R390A. Interestingly the boxes on
mine are miss-printed 64C instead of 6C4. The Tube itself is marked 6C4, no
W, or WA, just JAN (Joint Army Navy) 6C4.
(14 pages)
(10 pages)
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