Vintage HP equipment often had HP made power transformers, which ran all the time whether the equipment was on or off. The core loss while idling could be fairly high. The core was usually just below saturation, so that if the power switch was on 100V, it would really get hot.
There was some logic analyzer model that HP engineers referred to as the "logic furnace" because it ran so hot. Rick Karlquist N6RK On 1/27/2016 4:22 PM, Burt I. Weiner wrote:
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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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