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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