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Re: [Amps] Amps] SB-220 update & gettering

To: Rob Atkinson <>
Subject: Re: [Amps] Amps] SB-220 update & gettering
From: Mike Waters <>
Date: Sun, 27 Nov 2016 14:51:43 -0600
List-post: <">>
Rob is exactly right. Tubes have failed even with regular use because they
were never periodically run hot enough.

A well-known case in point was a commercial broadcast transmitter with a
3-500Z driver tube, which never ran red. Those tubes were failing way
before they should have. The fix was to replace it with a 3-400Z, which DID
run red and gettered the gas as it seeped in. Problem solved.

73 Mike

On Nov 26, 2016 11:34 AM, "Rob Atkinson" <> wrote:

> I disagree.  The internal graphite anode tubes must have color to
> de-gas and stay gettered.
> 73
> Rob
> K5UJ
> >
> > You don't need to see cherry red with those tubes,
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