[time-nuts] 5087A Distribution Amplifier

Jean-Louis Oneto Jean-Louis.Oneto at obs-azur.fr
Wed May 2 18:29:01 EDT 2007

Hi Brian!
Last time I had this problem, it was the VERY BIG capacitor (1500MFD - 
40VDC) which measured as 21.8pF (yes PicoFarad!!!)
Jean-Louis Oneto
OCA GEMINI - Avenue Copernic - 06130 Grasse - France
Tel: (+33)[0]493.40.53.80, Fax: (+33)[0]493.40.53.33
e-mail: Jean-Louis.Oneto at obs-azur.fr
----- Original Message ----- 
From: "Brian Kirby" <kirbybq at bellsouth.net>
To: "Time Nuts" <time-nuts at febo.com>
Sent: Wednesday, May 02, 2007 9:54 PM
Subject: [time-nuts] 5087A Distribution Amplifier

>I bought an HP 5087A distribution amplifier off of ebay.  "The unit is
> in good working condition".  Funny the power supply is putting out 120
> hertz square waves.....which makes all the outputs look like they are
> oscillating garbage....disconnecting the power supply from the load does
> not change the situation.  I subbed a test power supply and the
> amplifiers work fine.
> Does anybody have the schematic to just the power supply and could I
> bother you to scan it and send to me, or a link to get it, or the manual ?
> The power supply looks very simple, but the schematic sure makes life
> easier !
> Thanks in advance - Brian N4FMN - kirbybq at bellsouth.net
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