[ARC5] BC-348M

[Dennis Pharr]

I am also currently trying to restore a BC-348P model and I have the exact
same problem - a short across the B+ line.  I suspect the issue is a shorted
cap as well.  

Also, while tracing the wiring I've noticed a very odd thing - one of the
six "canned" .5uf 250V caps (39-1) has buss wire shorting the terminals.
The buss wire shorting the cap appears to be "as-built" since the pictorial
wiring diagram also shows this cap as being shorted.  I can't understand why
the designers would include a large canned capacitor in the design and then
specify it as shorted in the documentation.

If it was a last minute design change (possibly during production runs), you
would think they would modify the design and leave out that Cap on
subsequent production runs.  

It just seems to be a very odd thing, but maybe I'm missing something.

73
Dennis
WD5JWY 
Oklahoma City  

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of Tom Elmore
Sent: Thursday, December 19, 2013 9:44 PM
To: 'arc5 mail list'
Subject: [ARC5] BC-348M

I am in the process of bringing a BC-348M< back to life. Is it correct that
pins 2 & 6 are the receiver muting when paired with a transmitter? It
appears I need to short them together to provide B+ for some of the tube
screens.  It also appears I have a short (probably a cap) on pin#2 somewhere
in the chain.

 

 

 

 

Thank You 

 

Tom Elmore KA1NVZ

Anchorage, Alaska 

 

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