I think somewhere in my ¡°paper¡± archives I have either a GE or RCA bulletins. I thought that one of them showed how to make a home-brew test jig that would adequately test emissions of transmitting tubes. Now I am going from memory but it had all the common tubes of the era and they even showed an 813 as part of the test. The bulletins are available on line to read. I suggest you try there.
You can if they are good.? Have you checked them on a good tester.? My preference is to buy all three with matching attributes.? But, that is not necessary.? You ca replace the one that is bad.? But, be absolutely sure the other two are good.
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Lou WA5LOU
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On Tue, Mar 10, 2020 at 11:25 AM BJ-K7BRR via Groups.Io <wcbilljohnson=[email protected]> wrote:
I am repairing an AL-811 that was blowing fuses.
I found one of the 811 tubes had a short between the filament and plate.
My question is can I buy an 811A tube and run it with the two existing 811 tubes?
