HELP: WhazIt? TR switch?

[Jim Gantner]

It's a receiver preamp made by Dow-Key.  I used one in front of my Knight
R-55A.

It was a great tutorial in cross-modulation.

Jim
K4GT

-----Original Message-----
From: Boat Anchor Owners and Collectors List
[mailto:BOATANCHORS at LISTSERV.TEMPE.GOV]On Behalf Of Ian Webb
Sent: Monday, April 03, 2000 8:02 PM
To: BOATANCHORS at LISTSERV.TEMPE.GOV
Subject: HELP: WhazIt? TR switch?


Along with some other equipment I acquired what I believe to be a
1950s, early 1960s TR switch.

I recognize the power supply it's attached to as a modified AMECO
unit.  I can't remember the details of the unit in the foreground of
this picture which I believe is a TR switch.  I also seem to remember
it being late 1950s to early 1960s vintage.

Take a look at:
http://www.geocities.com/k6sde/TR_Switch/TR_switch.jpg

Anybody with a better memory than mine?

Who made it?  (Johnson???)
What does it do?  ("isolate" the receiver from the antenna??? or??)
How does it fasten into the antenna system?

I probably won't ever use it but would like to know more about it
before I make that decision.  If I know the years when it was sold I
can go to the library and try to find an ad or article in and old QST
about it.

Ian, K6SDE
k6sde at my-deja.com