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" <[email protected]>
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.
[email protected]
www.biwa.cc
K6OQK
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