tubes age 60
That's precisely what a Grid Circuit Tester does. It checks for grid emission that
makes control grids go positive. I think I posted the schematic of one last year. I
know I traced it out and then scanned it for someone. I've know TV shops to
ignore the big tester and use only the grid circuit tester, it found more troubles
far faster than the big tester that ignored grid emission.
6BA6 is S-line receivers are run hard and regularly fail with grid emission
making the s-meter go backwards and AGC not working.
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Date: Sat, 3 Feb 2001 09:44:12 -0800
Subject: [R-390] Tube sources?
I know this has come up before, but I'd like to find sources for replacement
tubes for my R390A. I also have a question about tubes marked NOS. How well
do stored tubes hold up over many years? What is the probability that a NOS
tube will be functional? If you need one good one, do you buy three or four at a
time (ignoring the need for stockpiling spares)?
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Date: Sat, 3 Feb 2001 14:24:24 -0500
Subject: Re: [R-390] Tube sources?
In my experience, they hold up very well. I know for a fact, that Antique
Electronic Supply and Fair Radio will provide replacements with no questions if
they arive DOA . I'm sure most of the other vendors will also make good on
them as well.
I've had some old NOS transmitting tubes go gassy or lose vacuum after long
storage, but rarely had problems with octal, 7pin min and 9 pin min.
Sometimes an open filament or heater from vibration during shipment, but
never gassy.
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Date: Mon, 5 Feb 2001 08:13:46 -0800
Subject: Re: [R-390] Tube sources?
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