[ARC5] BC-453 B dynamotor hum

[WA5CAB at cs.com]

Some brushes do swell for no apparent reason.  I have had at least three 
cases where the armature in an NOSB GN-58-A could not be turned.  In each case 
the culprit was the negative LV brush.  I don't know what the symptons 
would have been had the generator been in occasional use during the swelling 
period.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 11/03/2015 10:26:20 AM Central Standard Time, 
kgordon2006 at frontier.com writes: 
> Also, that same document suggests that the brush-holders can become too 
> tight for any number or reasons. Testing this requires you to check each 
> brush for very easy movement into and out of the brush-holder. If there is 
> 
> even the slightest hang-up, you must either slim-down the brush, or widen 
> the holder.
> 
> Ken W7EKB