[Amps] Vacuum relay replacement

[Carl]

Wire it so that you can transmit thru the NC position for a few seconds. 
Then do it with some VOX CW. Wire back to normal and it should be OK.

All brands seem to develop a dead spot on RX after XX years.

Carl
KM1H


----- Original Message ----- 
From: "Gary Smith" <Gary at ka1j.com>
To: <amps at contesting.com>
Sent: Friday, October 26, 2012 1:35 AM
Subject: [Amps] Vacuum relay replacement


> Finding the bugs in my newly acquired amp. Today I found I could
> transmit but couldn't receive & I tracked the problem to amp and the
> with further inspection, to the Kilovac T/R. I think Jennings RJ1A
> relays were in the original Alpha PA-77 so I think it's been changed
> before.
>
> Discovered the relay was locked in the transmit position and there
> was continuity between COM & NO and none between COM & NC. the K3
> received properly when shorting COM & NC. Took a screwdriver and
> placed that on the NO terminal & gave it a light whack & that freed
> the relay and it's back to working. I'm guessing this relay has been
> a problem before and it'll surely fail again so I'm going to replace
> it with a different one.
>
> I've been looking at the specs on different 8ms relays that fit and
> the RJ1A-26N969 which is the RJ1A with a silicone coated top is
> supposed to be rated for 10kv as opposed to the RJ1A at 5kv, other
> than that they are the same relay. Seems like it would be an ideal
> replacement but anyone know a reason I shouldn't use this one?
>
> Thanks,
>
> Gary
> KA1J
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