Gary, I had the same problem with my 77DX. Reversing the coil leads cured
it . I think the relay core becomes magnetized. It has been working FB for
several years since I did that.
73, Dan, N5AR
On Fri, Oct 26, 2012 at 6:55 AM, Carl <km1h@jeremy.mv.com> wrote:
> 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@ka1j.com>
> To: <amps@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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--
Dan Hearn
N5AR
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