[Amps] TL922A recommended mods?

[Gudguyham at aol.com]

Jim, I have a couple of those amps here now and repaired a few in the  
past.  This amp DOES NEED a soft key circuit.  That is #1 in the list  if you 
don't change the relays.  There are 2 relays in there one for  antenna change 
and one for bias.  You'd have to speed them both up if you  go vacuum.  
Surely a glitch resistor won't hurt.  If you want a step  start Harbach has one 
that fits (why re-invent the wheel). The "A" model has 10  meters disabled.  
You might want to enable it while you have it.  Info  on the net.  Other 
than that I'd stay away from any of the bizarre mods  which are out there.  GL 
 Lou
 
 
In a message dated 8/14/2012 9:52:47 A.M. Eastern Daylight Time,  
fortra at siol.net writes:

Jim,

take a look at www.pa0fri.com

So far, looks the  best and simple solutions of
the queries in question..

Gl Nermin  S58DX
----- Original Message ----- 
From: "Jim Garland"  <4cx250b at muohio.edu>
To: <amps at contesting.com>
Sent:  Tuesday, August 14, 2012 3:35 PM
Subject: [Amps] TL922A recommended  mods?


>A friend has a recently acquired lightly used TL-922A  that is unmodified 
>and
> works perfectly on all bands. He has  asked me to replace the clunky T/R
> relay with a quieter & faster  vacuum relay, and also to install a solid
> state relay to take the  burden off the power switch.  I'm not familiar 
> with
> this  amplifier, but from looking at on-line postings it appears to be an
>  amplifier that owner's can't keep their hands out of! I've never seen 
such  
> a
> hodge-podge of proposed modifications, some of which strike  me as 
bizarre,
> others of which purport to improve on the original  design, but which 
> appear
> to be mostly preventative  maintenance rather than solutions to actual
> problems. Still other mods  probably work just fine, but are hard to 
> install
> and require  complicated circuitry.  So, my question is whether anyone can
>  recommend a simple way to swap out the noisy antenna relay and take  the
> burden off the main power switch? I'm particularly interested in  the
> mechanical layout, routing of wires, etc.  I've not looked  inside the
> amplifier yet, but from photos it appears to be rather  difficult to work 
> on.
>
>
> Thanks!
>
>  Jim W8ZR
>
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