tubes age 225
6AK5's are same base and in my experience work just fine. In a pinch most of
the pentodes can be swapped around and you'll still have a working radio. I
once just randomly started swapping the pentodes around between oscillators,
IF deck, and RF deck, and while the AGC characteristics were messed up if I
played around with multiple tubes in the IF deck, the radio still worked. Most of
the 7-pin RF-type pentodes have identical or similar pinouts. 6AJ5's are in
stock at all the major suppliers (Antique Electronics Supply, ESRC, etc) and
cheaper than
E-bay. I don't think the military had zillions of mil-spec 6AJ5's stockpiled like
they did the 6AK5. I'm not sure I've ever seen a JAN 6AJ5.
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Date: Mon, 22 Feb 2010 19:25:14 -0600
Subject: Re: [R-390] 6aJ5 Substitute
http://shop.ebay.com/?_from=R40&_trksid=m38&_nkw=6aj5&_sacat=See-All
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Date: Mon, 22 Feb 2010 21:55:55 -0700
Subject: Re: [R-390] 6aJ5 Substitute
6AJ5'a are available from Antique Electronic Supply for $2.50 cents each. When
you can get them this cheap there is no point in modifying you rig for another
tube. Go to the following. link http://www.tubesandmore.com/
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Date: Tue, 07 Sep 2010 13:08:20 -0400
Subject: Re: [R-390] Fake Caps
Speaking of Tube Washers... our purchasing dept was scrambling to find
some sort of replacement for the RCA 3N200 RF signal MOSFET in a receiver.
This was at a time when the industry was really shutting down the production
those kinds of discrete RF parts. I had been charged with evaluating samples
from these lower tier fab houses and distributors that purchasing was finding.
One set of samples caught my eye when as I handled them, the part number
stamped on cases would easily rub off. The response on these parts as I
tested them was just as horrifying. The curve tracer display was unidentifiable
as anything. What did the "supplier" think? That "maybe they just won't
notice"???
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