[Boatanchors] What to do about 811A vacuum?

[Dave Harmon]

Any 811-A will work just fine....if you stay below 15m.....

Dave Harmon
K6XYZ
Sperry, OK.

-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
<boatanchors-bounces at mailman.qth.net> On Behalf Of Rob Atkinson
Sent: Friday, August 22, 2025 10:41 AM
To: ah7i at gatech.edu
Cc: BOATANCHORS <boatanchors at mailman.qth.net>
Subject: Re: [Boatanchors] What to do about 811A vacuum?

811A should be able to handle 2 KV.  I think that's what a manufacturer
(RCA?) told EFJ.  You can certainly go with the S.S.
572Bs but I bet they want a fortune for them.  How do the Soviet 811As
differ from the ones made here?  The old RCA 811As should be able to handle
1.8 KV.  You have to watch the plate current and dissipation.
This is not an AM RF tube.  CW is okay.  Give them a lot of air.  I'm sure
you'll get a lot of opinions.  I'd try whatever is cheapest first.

Rob
K5UJ
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