[Milsurplus] Lower voltage dynamotors

[Mike Hanz]

Fellow devotees of dynamotor whine,

For a while now I've been tracking DY-77/AIC-10 interphone amplifier 
power supplies.  They're normally a small open chassis with a couple of 
filter caps and a small dynamotor on them to power the pencil tubes in 
the AIC-10 interphone set and associated speaker.  Reason for the 
interest?  It has a command receiver size dynamotor on the back that 
produces 175 vdc - about 75 volts less than the standard dyno for these 
sets.  That's quite a bit easier on the capacitors in these old 
ARA/274N/ARC-5 and other 250v sets, without significantly reducing their 
overall performance.  Recently I purchased yet another one of them, but 
this one is different from the ones I've been picking up.  It's a 
DY-76A/AIC-10 - the dyno is somewhat larger, and I thought from the 
picture it might be about the size of the BC-348 dyno.  Unfortunately, 
it's not the same size.  At 3.5" it's roughly the same diameter, but 
it's 6.75" long.  The reason I mention it is that the seller has a few 
more of these, and they're all NIB.  They'll put out a total of 600mA, 
so if you wanted to power several sets from this one supply it would be 
quite easy.  Note that you will have to fabricate a mount for it, 
basically an aluminum plate with four 1/4-20 threaded standoff posts - I 
can send a drawing that I cobbled up if anyone is interested.  No 
connection to the seller except a satisfied customer, but I thought I 
might mention one of the URLs with a picture:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=1502&item=5779011126

This one is closed, but I'm sure he'll list it again.

73,
Mike