[R-390] RCA RBC Radio

[Roger Ruszkowski]

Ted,
 
The usual suspects in order.
 
A tube going bad. Any tube draws excess current or less current changes the B+ load and drifts the oscillator.
Oxide in a tube socket. Any tube socket. adds resistance to a B+ line and drifts the oscillator.
A leaky cap in the oscillator section.
 
Check all the tubes.
Deoxit the sockets pins and switches.
Give the chassis a general good dusting
Give the case a bath if you can get every thing out of the case.
Eye ball all the parts and solder joints under the chassis for problems.
 
Shot gun the general stuff first and se if you get a cure.
If no then get specific in the oscillator.

Roger AI4NI
 
 
-----Original Message-----
From: Ted Breaux <tbreaux7 at comcast.net>
To: R-390 Group <R-390 at mailman.qth.net>
Sent: Sat, Aug 23, 2014 3:25 pm
Subject: [R-390] RCA RBC Radio


I enlist your help to know where to look for my RBC radio drifting off 
frequency.  This radio has been "rock solid" for years and just began to drift, 
slightly, today.  Any ideas will be appreciated.  Yes, I have a 390A.

tbreaux7 at comcast.net

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