Hi All: I put extended fins on my 1980's Hp equipment by drilling and tapping the existing sink. I used the white heatsink grease from Radio Shack to help. Don Latham
Joseph Gray > The heatsink on my unit is quite hot, also. I'm thinking about putting > a fan on it after I get everything working. > > > On Sat, Oct 10, 2009 at 9:24 AM, Greg Burnett <[email protected]> wrote: >> Roy, >> >> The HP 5370A rear mounted heat-sink typically heats up to around 61 >> degrees >> C. This is very hot to the touch, so I suspect your unit's temperature >> is >> normal (unless it's running way hotter than 61 degrees C). >> >> The buzzing transformer might just be due to loose, vibrating >> laminations. >> You might try tightening the transformer's bolts to see if that reduces >> the >> buzz? >> >> Best, >> Greg >> >> P.S. I agree that the rear mounted heat sinks of most other HP equipment >> run >> significantly cooler. The models that run so hot to the touch are the >> 5370A/B, 5359A, and many of the legacy HP pulse generators (from >> Boblingen >> Division). >> >> >> ----- Original Message ----- >> From: "Roy Phillips" <[email protected]> >> To: "Discussion of precise time and frequency measurement" >> <[email protected]> >> Sent: Saturday, October 10, 2009 4:08 AM >> Subject: Re: [time-nuts] 5370A >> >> >> Hi Joe >> I have a similar problem so I would be pleased to hear from you with any >> useful information. The basic problem with mine is that the power supply >> is >> suspect - it works, but there is excessive heat, much greater than any >> other >> HP instrument that I have, from the rear mounted heat-sink, this is too >> hot >> to hold your hand on ! There is also a very obvious buzz from the power >> transformer, even when it is on "stand-by" - so I guess at worst it >> could be >> shorted turns in the power transformer, or probably better, a faulty >> bridge >> rectifier,or one or more of the large reservoir caps - this an early >> model >> (1984), so perhaps it is to be suspected. I also think the performance >> is >> not to specification, but I will check-out the perceived problem with >> PSU >> before I investigate this matter. I am just about to start the >> investigation of the prime problem. >> Roy >> >> >> >> _______________________________________________ >> 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. >> >> > > _______________________________________________ > 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. > -- Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com _______________________________________________ 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.
