[Amps] TL-922(A) Recent Acquisition

[Alex Gavva]

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 at 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 at 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 at contesting.com] On Behalf Of Steve Wright
>>> Sent: Tuesday, October 25, 2016 5:25 AM
>>> To: amps at contesting.com
>>> Subject: Re: [Amps] TL-922(A) Recent Acquisition
>>>
>>>> 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
>>>
>>>
>>>
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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