[R-390] IF Modifications - Teledyne 3399

[gary.biasini at shaw.ca]

Sorry folks,  I neglected to add the break in the C547 connection and the
addition of the new C547 connection.  Attached is a corrected PDF schematic.

Regards,

-----Original Message-----
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On
Behalf Of gary.biasini at shaw.ca
Sent: January 22, 2023 9:01 PM
To: R-390 at mailman.qth.net
Subject: [R-390] IF Modifications - Teledyne 3399

Good evening,

 

After some procrastination, I finally traced all the modifications that I
could see on the IF sub-chassis of one of my R-390a receivers.  I attach a
marked up schematic showing the changes.  This radio was in the worst shape
of the R-390a radios I have had and I have spent much time bringing it back
into shape.

 

Unfortunately, I cannot advise what effect these modifications appear to
have (they look like SSB and AGC modifications) since I cannot get the radio
to operate.  I had to stop troubleshooting as I blew all the 1/8 amp fuses
that I had and am waiting for some to arrive.

 

 

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