[ARC5] BC-454-B Dymamotor Question

[Mark K3MSB]

When using the dynamotor on the BC-454-B, there's a constant loud buzz in
the audio that I would think is coming from the dynamotor as it sounds like
a motor sound.   I tried both dynamotors in the radio and one seems a lot
less pronounced, but still strong.

I then wired in separate 250V and 28V supplies (non dynamotor) and the
receive audio is great.

Is what I'm hearing with the dynamotors normal?

73 Mark K3MSB