27.11.2016 7:30, Vic Rosenthal пишет:
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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Russian P1D-1W vac relays in TL-922 : http://www.ur4ll.net/19040.jpg
--
Dr Alex Gavva My QRO Parts site: www.ur4ll.net
UR4LL, KO80db
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