Hi Woody,
I converted a few 3-500Z amps to full QSK using the circuitry that Rich
Measures designed. It also employs a vacuum relay. I am currently using this
circuit in a Drake L-7 amp. As an added benefit, the Electronic cathode-bias
switching portion of the circuit also allows you to get rid of all that heat
in the Drake L-7, L-4, or L-4B power supply by eliminating the need for
those two 50K/50watt resistors!
de Benton wb5twc
----- Original Message -----
From: <WoodMirLtd@aol.com>
To: <TenTec@contesting.com>
Sent: Sunday, July 14, 2002 12:22 PM
Subject: [TenTec] thanks for Corsair II/SB-221 advice
> Hi all,
> Many thanks to Jim K4CGY, Gary Hoffman, Dick KD4BRL, and another OM who
> recommended the Harbach mods (sorry I can't remember the name-XYL was
> meddling with the reader and deleted) for the advice on Corsair II and
SB-221
> compatability. One experienced toasted T/R relay contacts and another's
held
> up well (wonder if TT used a relay with higher rating?). Dick sent a JPG
of
> a nice interface to isolate the T/R relay contacts without another relay
> clattering. It looks similar to the Ameritron device. I'm definitely
going
> to look into the Harbach parasitic supression mod and homebrew Dick's
> interface for peace of mind.
> On a related note, has anyone ever made the QSK vacuum relay mod to a
> SB-221 or similar amp?
> Last but not least, thanks for all the interesting and educational
dialog
> on the list. I used to wonder why TT fans were so devoted until the
Corsair
> II displaced my ICOM. Being in a rush to get on the air, an incorrect
> connection was made to the external VFO. It was right before Christmas
but I
> called TT anyway. I was immediately connected with a technician familiar
> with the Corsair II who ran through the schematic and had an answer within
5
> minutes. He even offered to throw a low signal NPN transistor in the
mail,
> but fortunately there was one in the junk box. We were up an runing in
about
> 15 minutes. Thanks again TT!
> vy 73,
> Woody N5ZU . .
>
>
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