[AMRadio] R-388 PTO info needed

Mike Sawyer w3slk at uplink.net
Sun Dec 25 20:31:15 EST 2005

I'm curious if they are the same as the ones used in the T-195. I think that 
the 75Ax use that one.  I might be worth a look to
(un)Fair Radio. They used to sell the T-195 PTO's for a song. Beats the hell 
out of the alternative.
----- Original Message ----- 
From: "John Lawson" <jpl15 at panix.com>
To: <amradio at mailman.qth.net>
Sent: Sunday, December 25, 2005 4:47 PM
Subject: [AMRadio] R-388 PTO info needed

   Further to my Xmas Eve Scrooge Radio Post - I have discovered that no
signals of any kind appear on the PTO output cable when isolated from the
mixer tube, and injecting the correct frequency into that pin of the mixer
(from my bench oscillator) restores the radio to operation.

  So, of course, the PTO has quit, and the tubes (AFAIK) are good - but
next I'll replace them with a couple that test out at better than 70% Gm -
somehow I think that's not going to be the Problem.

   If anyone within the sound of my keyboard has any experience actually
repairing this series of PTO - it's a Collins 70E-15 ser. M1751 - I'm
trying to guage whether I should spend the time to dredge it out and fix
it - or (since the front panel needs to be refinished) I would be better
served by just bundling it off to someone and letting an expert refurb the
radio. I do plan to keep it, it's my Fave Reciever - for Ham and SWL -

  Also: if you have a quote to perform the above, lemme know ASAP - I'm
'motivated' as they say in Real Estate.

  Cheers and Best of the Season!

John  KB6SCO
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