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 garbagedisconnecting the power supply from the load does
not change
Your a life saver. Can you confirm the pass transistor part number and
the regulator IC, looks like the 723 ?
Dr Bruce Griffiths wrote:
Brian Kirby wrote:
I bought an HP 5087A distribution amplifier off of ebay. The unit is
in good working condition. Funny the power supply is putting out
Message -
From: Brian Kirby [EMAIL PROTECTED]
To: Time Nuts time-nuts@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
Brian Kirby wrote:
Your a life saver. Can you confirm the pass transistor part number and
the regulator IC, looks like the 723 ?
Brian
Regulator is a 723, Transistor Q1 is a 2N3054.
Bruce
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- Original Message -
From: Brian Kirby [EMAIL PROTECTED]
To: Time Nuts time-nuts@febo.com
Sent: Wednesday, May 02, 2007 9:54 PM
Subject: [time-nuts] 5087A Distribution Amplifier
: [time-nuts] 5087A Distribution Amplifier
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
