[Boatanchors] RadioMarine Corporation AR-8506-B Receiver Resurrected.

[hwhall at compuserve.com]

Not sure why it's there but the Philco 645 I'm working on has .002uF caps across each half of the CT audio output primary.

WayneWB4OGM
-----Original Message-----
From: David Stinson <arc5 at ix.netcom.com>
To: milsurplus at mailman <milsurplus at mailman.qth.net>; Boatanchors at mailman <boatanchors at mailman.qth.net>
Sent: Mon, May 2, 2022 9:36 pm
Subject: [Boatanchors] RadioMarine Corporation AR-8506-B Receiver Resurrected.

WWII "Liberty Ship" RmCA AR-8506-B receiver
gets back to work.  This one was challenging.
(Got it going, Doug! TNX OM)
Still need to finish alignment.

Video:

https://photos.app.goo.gl/KqWcYNnnFaKxkj5n8

Question:
I probably should know this, but I don't want
to assume.  Can someone please tell me
the purpose of the capacitor across the
Audio Output transformer primary?
C-141 from plate to screen of the 25L6.

https://photos.app.goo.gl/BFyqarNgQ9BuQfbF7

If it's included, or even reduced from .005
to .001, the Audio Output breaks into
"motor boat" oscillation. Lower value gives
slower reflex oscillation, but remove it
completely and it goes away.
The coupling and bypass caps
have been replaced, as have the power supply
filter caps of course.  Addition of more
bypassing on the B+ buss has no effect.
The bad resistors also replaced,
so the grid isn't floating.

Hints and Kinks about this rig
if anyone is interested.

GL OM ES 73 DE Dave AB5S


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