[ARC5] BC-454-B Dymamotor Question

[David Stinson]

----- Original Message ----- 
From: "Mark K3MSB" <mark.k3msb at gmail.com>

> Is what I'm hearing with the dynamotors normal?

Not at all.
Here are common causes of dyno noise:

*  RF bypass caps in the ends of the dynamotors 
    directly across the brushes bad.
*  Bad 5 mFd B+ buss filter.
*  Bad .22 uFd bypasses (the big bathtub cap).
*  Bad brushes.
*  Worn or dirty communtator.  Consult 
    Mike Hanz's work before attempting 
    to clean or burnish commutators.
*  Bad or dry dynamotor bearings.

Check these and we'll go from there.

73 DE Dave AB5S