[ARC5] The Litte ARC-5 That Could - Sound Good!

[Christopher Bowne]

Set up a simple audio monitor circuit today to listen to test audio  through the 
BC-456 screen modulated T-19 using a small signal diode  tapped off the O scope 
and  counter pick up link on the coax between the  watt meter, and in this case, 
dummy load.  Fed the diode output right  into the aux input of the duty bench 
Fisher Studio Standard amp and  speakers.  All I can say re the results is 
whoa!!!.  I thought this  little transmitter sounded good through the R-392, but 
being able to  hear the full spectrum without any bandwidth limitations or 
distortion  in the receiver feeding the amp really gave me an appreciation on 
how  good these things can sound. I guess when the entire modulator consists  of 
two transformers and a single ended Class A 1625, there's not too  much you can 
do to screw up what you feed into it!

After an hour  of so of pumping 15 watts carrier plus continuous test audio to 
the Bird  dummy load, the transmitter and modulator themselves were not too 
warm,  but the DM-33 dyno was pretty hot, about 165 degrees on the case as  read 
with a infrared surface temp scanner.  What's the typical rated  temp rise limit 
for a continuous duty dyno?