[Top] [All Lists]

Re: [Amps] Series C in amp output

Subject: Re: [Amps] Series C in amp output
From: Chris Wilson <>
Reply-to: Chris Wilson <>
Date: Fri, 16 Feb 2018 14:37:23 +0000
List-post: <>

Hello K5AM,

What an elegant machine, lovely! :)

On Thursday, February 15, 2018,  you wrote:

> Bill, the amplifier was built in 1971, and ran with the
> first tube for 17 years. That tube still ran perfectly,
> but I had a few spares on the shelf, and read
> somewhere that it was good to rotate them, for
> gettering. So I began to rotate tubes about every five
> years.

> Very heavy DXing and contest use over 47 years, but
> no problems. The 4CX1000A has serious grid and
> screen current limitations, but the amp has a full set
> of protection circuits.

> As for tube life in general, I can relate that the 6
> meter amplifier that I built in 1961, with push-pull
> Eimac 4-400A tubes, is still running full power after
> 57 years, with the original tubes, used to work 138
> countries on 6 meters. Was Eimac great, or what?
> And of course Bill Orr, W6SAI (SK), the Eimac ham
> contact at the factory, was great to chat with
> whenever I phoned him with a question.

> 6 meter amp:

> 73,

> Mark, K5AM

Best regards,

Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>