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
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.
On Tue, Oct 25, 2016 at 10:00 PM, Mike & Becca Krzystyniak <firstname.lastname@example.org>
> 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
> 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:email@example.com] On Behalf Of Steve Wright
> Sent: Tuesday, October 25, 2016 5:25 AM
> To: firstname.lastname@example.org
> Subject: Re: [Amps] TL-922(A) Recent Acquisition
> On 25/10/16 15:28, Jeff Breitner <email@example.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
> > attic. I don't think it has many hours on it. Which of course may
> > 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
> for it.
> Leave it idling there for a day, then ground the PTT input for just a
> and see if you have any idle IP. If so, I'd just use it for an evening
> 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
> there were no issues. Two screws wont fit the panel now
> - I just left them out.
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