I've cured problems similar to this with mechanical switches by running a
small dc current thro the contacts from a 12V source. It would tricky to do
this with rf involved, an isolated supply for a start, but it might be worth
the effort.
David
G3UNA
----- Original Message -----
From: "Jim Brown" <jim@audiosystemsgroup.com>
To: <amps@contesting.com>
Sent: Monday, December 01, 2008 5:52 PM
Subject: Re: [Amps] Vacuum Relay Issues
> On Mon, 1 Dec 2008 09:33:58 -0800, K5RC wrote:
>
>>One by one, however, I am having problems with the vacuum relays.
>>They are developing intermittent contact on receive.
>
> Hi Tom,
>
> This is a common failure mode. I have the same problem with the relays in
> my Ten Tec Titan amps. Original equipment was Jennings, I've used some
> Jennings parts that are supposedly new pulls from industrial equipment,
> also new Gigavacs as replacements. If I run QSK I get a year or two out of
> them.
>
> 73,
>
> Jim K9YC
>
>
>
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