[ARC5] BC-348 Dynamotor

[Mike Morrow]

Bob wrote:

> A short on the output winding will act as a dynamic 
> brake and cause the symptoms you are seeing.
 
That's exactly what my experience fifty years ago showed...with the failure of a HV capacitor in the radio's circuit.  I still remember well many examples ever 50 years ago where an original command set receiver with dynamotor would be working well...until a drastic speed reduction of the dynamotor heard, along with loss of receiver function and often the smell of a hot resistor...the dreaded signs of capacitor failure on an HV line to ground.  The last time it happened to me I was playing with an RT-34/APS-13, 30 years ago.  Original capacitors and the original dyno HV supply magnitude are not generally compatible 70 years after the gear was made.

The indications I read so far indicate this type of failure...NOT a dynamotor failure.  It is yet unstated if the receiver has again been verified to work on that AC supply.  I wouldn't put much money on that...I hope the AC supply is fused!  ;-)

Mike / KK5F