"Lynn Coffelt" writes:

I believe that 50C continuous operation means that is the maximum
temperature for continuous operation. Ambient air temperature (and even
altitude in airborn stuff) as well as circulating air make a world of
difference. Smoking the shellac is not good, and can be smelled easily if
you remove the end dust caps, and leave them off. In the golden days, I
thought something was wrong with dynamotors on surplus so-called Command
Sets if I couldn't leave the palm of my hand on the dynamotor for 10
seconds. Ouch, ouch, ouch........
Old Chief Lynn

I found an old manual in my stash that talks about "FITCAL" for
checking out old radios. This TM-11 manual said that the dynamotor is
okay if you could "lay your palm on it for 5 seconds without
discomfort."

Reading that as a spec, my dynamotor is running just fine. There's
no smell of burning.

The radio room in a B-17 must have been buzzing with dynamotors...

Thanks,
Steve.

--
Steven D. Swift, , http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC. P.O. Box 55997
206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA