I would definitely replace it with vacuum relays, or a vacuum relay plus a reed
relay. The stock relay tends to hot switch with semi-QSK CW and SSB VOX. It
isn't worth saving.
Vic 4X6GP
> On 27 Nov 2016, at 00:08, Jeff Breitner <lists@rudn.com> wrote:
>
> Update on the recovery.
>
> Amp powered up, everything on the HV side and tube side looked good, or as
> good as I expected. Was able to key the amp with no drive and see idle
> plate current, amplifier didn't do anything unexpected in the hours I let
> it run.
>
> However, when it came time to apply some RF, a check of the input showed it
> to be open. I recalled during the inspection that there had been plenty of
> activity around RL-1, antenna relay. Sure enough, there was enough
> Cramolin residue on the inside part of the relay, and the spring was
> missing. Contacts cleaned up seemingly good enough, but without the spring
> that is nothing.
>
> It appears the MM2 relay is still available, for a healthy $180 or so,
> although I think this can be salvaged if I can find some sort of spring.
>
> Jeff
>
>
>
> On Tue, Oct 25, 2016 at 10:00 PM, Mike & Becca Krzystyniak <k9mk@flash.net>
> wrote:
>
>> I just restarted a TL-922A I received from an estate that was off since
>> about 9/11.
>>
>> Bedroom kept, I tried the variac ramp first and the thing buzzed like
>> crazy.
>>
>> I quickly realized it has a soft start in it, or something similar as the
>> relays chattered until they locked in.
>> Then all systems were normal. I let the amp burn in at ~100V for 24 hours
>> and then 120V for another 24 hours.
>>
>> From there, like Steve suggested key up and see if they have Ip.
>> In my case, all went well and the tubes seem 100% despite their long nap.
>>
>> Mike K9MK
>>
>>
>>
>> -----Original Message-----
>> From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Steve Wright
>> Sent: Tuesday, October 25, 2016 5:25 AM
>> To: amps@contesting.com
>> Subject: Re: [Amps] TL-922(A) Recent Acquisition
>>
>>> On 25/10/16 15:28, Jeff Breitner <lists@rudn.com> wrote:
>>> I'd like to get some opinions/thoughts on bringing back into operation
>>> a TL-922a that I recently acquired. The unit sat for at least 15 years
>> in
>> an
>>> attic. I don't think it has many hours on it. Which of course may
>> mean,
>>> it is broken.
>>
>> Switch to CW and fire it up. If you were really worried about it - then
>> start it up on the variac at 75% input volts, and bring it up to full mains
>> input over an hour or so.
>>
>> If you were really worried about a fault, then switch the amp on first -
>> then switch on at the wall plate. That might save you sourcing a new
>> switch
>> for it.
>>
>> Leave it idling there for a day, then ground the PTT input for just a
>> second
>> and see if you have any idle IP. If so, I'd just use it for an evening
>> with
>> about 25 watts drive. If it worked fine for a couple hours with no cranky
>> stuff, then I'd switch mode to SSB and tune it up at maximum drive and just
>> use it.
>>
>> If the panel meters are still lit then it hasn't had any work at all.
>>
>> There is only one mandatory mod, and that is remove the bottom panel and
>> swap it end-for-end, so the holes are under the tube sockets. If you don't
>> do this, the solder will melt in the tube pins and drop out - after this
>> mod
>> there were no issues. Two screws wont fit the panel now
>> - I just left them out.
>>
>>
>> Steve
>>
>>
>>
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