[R-1051] R-1051B/URR R-23?

[David Wise]

I can't find anything either.  I looked in scans of TO 31R2-2URR-221C (the "B&C Tech Supplement") and Navships 0967-970-9010.  In the latter, the revised chassis diagram is "Temporary Change 2 - To Be Supplied" on an otherwise blank page.  Curse!

This is sheer guesswork, but perhaps the 100cps draws more +20 than the old 500cps did, and they added R23 to conduct some current around the pass transistor to avoid heating it excessively.  In that case, I'd say the dangling end of your resistor should go to the +25V rail.

Dave Wise

-----Original Message-----
From: R-1051 [mailto:r-1051-bounces at mailman.qth.net] On Behalf Of Jim Green
Sent: Thursday, July 09, 2015 3:11 PM
To: r-1051 at mailman.qth.net
Subject: [R-1051] R-1051B/URR R-23?

 I foolishly took the faceplate off my R-1051 so I could get it clean & repaint it. After cleaning it I decided repainting was not required. It is never going to be a new radio so I can live with a few blemishes on the faceplate. Also, I checked into silkscreen costs and that was the deciding factor.

I took lot's of notes and pictures & have it all back together as per the schematic. Only one caveat. There is a large power resistor mounted on the aluminum vertical support & shield plate that is is right behind the front panel. R-23 is printed on the vertical support plate and the power resistor is mounted with 2 each  4-40 screws to the plate. The resistor has a value of 64.9 Ohms at 10 watts. One end of the resistor is connected to the 100CPS control board at a point that says +20VDC from A2A6. My question is where does the other end of this resistor connect? I cant find R-23 on any of the schematics. Can anyone help?

I have the updated version of the service manual & I can find R23 on one of the top photos. I just cannot find a R-23 o any of the schematics  with this value.

Jim
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