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Old 17th June 2011, 12:45 PM   #1
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Default Replacing Diodes in Vintage HP Power supply?

I am working on a HP 6299A 0-100V regulated power supply. It is an older model dating back to the HP/Harrison days. 1966-ish vintage.

It has one bad diode but the diode is not marked and the service manual states:

Rect. si 200ma 180prv HLAB Mfg Code: 09182 Stock Number 1901-0033

Anyone familiar with HP parts? can anyone recommend a suitable replacement??
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Old 17th June 2011, 01:23 PM   #2
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Is it used with 3 other diodes that are the same in a 50/60Hz bridge rectifier?
(or with one other in a centre-tapped full wave rectifier).

If it is, then I would think that a basic 1N4004 will work. Back in 1966 all silicon power rectifiers were slow parts, so you don't have the same problems you get when replacing diodes in SMPSUs, where reverse recovery time is a big issue.

You might wish to replace the other 3 diodes (if in a bridge) with modern parts of course.
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Old 17th June 2011, 01:26 PM   #3
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No its not part of a bridge. it is in the regulator section. as input protection it looks like
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Old 17th June 2011, 01:32 PM   #4
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CR1 & CR2 in this pdf
Attached Files
File Type: pdf HP 6299A.pdf (134.7 KB, 41 views)
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Old 17th June 2011, 01:50 PM   #5
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Quote:
Rect. si 200ma
This makes me think it's a silicon diode, so an 1n4xxx should work fine. If the original part was a germanium diode, the higher forward drop of silicon might be a problem.
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Old 17th June 2011, 02:19 PM   #6
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It's 180V peak-reverse-volts, so it is almost certainly an early silicon rectifier diode.

I love the old 'CR' designation for the diodes. CR= "Crystal Rectifier".
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Old 17th June 2011, 06:09 PM   #7
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by Zero Cool View Post
I am working on a HP 6299A 0-100V regulated power supply. It is an older model dating back to the HP/Harrison days. 1966-ish vintage.

It has one bad diode but the diode is not marked and the service manual states:

Rect. si 200ma 180prv HLAB Mfg Code: 09182 Stock Number 1901-0033

Anyone familiar with HP parts? can anyone recommend a suitable replacement??
In my HP docs, the 1901-0033 is a 1N645.
There are huge numbers of suitable replacements, including the 1N4004.
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