oh yeah-cool :-) Don Joseph Gray > So now all your HP equipment looks like a 1950's parking lot, huh? > > On Sat, Oct 10, 2009 at 4:16 PM, Don Latham <[email protected]> wrote: >> 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. >> >> > > _______________________________________________ > 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.
