[time-nuts] HP Equipment Running Hot as Heck...

[Burt I. Weiner]

Don,

Something to be careful of... Be sure the mains voltage switch is set 
properly. I had a HP-3336A that ran hot like that. Like you, I put 
bigger and bigger heat sinks on the regulator, but all that seemed to 
do was make the bigger heat sinks as "hot as heck" also. What I 
discovered was that the mains voltage selector was set to 100 volts. 
I reset it to 120, (or was it 117) and it ran much cooler.

Burt, K6OQK


From: "Don Latham" <djl at montana.com>

Someone has already probably said, watch out for switching regulators.  BTW,
almost all the Hp instruments I have from the 80's era run hot as heck. I have
put on fans and piggybacked more fins (and more fins, and more fins...).  A
Military version of the 5328A counter I have has what sounds like a leaf
blower in it, with a proportional controller added.
If you do some work with switchers, I'm sure the list would be very interested!
Don

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California  U.S.A.
biwa at att.net
www.biwa.cc
K6OQK