[Amps] TL-922(A) Recent Acquisition

[Steve Wright]

On 25/10/16 15:28, Jeff Breitner <lists at 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