The Barney Oliver from Hewlett Packard - diyAudio
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Old 27th January 2010, 07:25 PM   #1
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Default The Barney Oliver from Hewlett Packard

Sorry, only employees were allowed to purchase:

Click the image to open in full size.

Internal Memo:
http://www.hparchive.com/Manuals/Bar...ifier_Memo.pdf

Manual:
http://www.hparchive.com/Manuals/Bar...ier_Manual.pdf

Thanks to the folks at HP Archive for this.
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Old 27th January 2010, 07:44 PM   #2
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Thanks fun stuff, though I would think you could do better than MJ4502's today. I had a scope in almost that exact same case in the early 70's. A small publisher went belly up and at the auction one of the guys had left a scope under his desk, got it for $5.
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Last edited by scott wurcer; 27th January 2010 at 07:47 PM.
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Old 27th January 2010, 07:55 PM   #3
forr is offline forr  France
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I presented this impressive amp yesterday on a french forum.

Cabinet de curiosités

Cabinet de curiosités
POST --> Tuesday 26 January 2010 15:56:50

I became aware if its existence less than a year ago, thanks to the diyaudio discussions.
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Old 27th January 2010, 07:59 PM   #4
llwhtt is online now llwhtt  United States
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Very cool, love HP stuff. Do you own one?

Craig
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Old 27th January 2010, 08:00 PM   #5
paulb is offline paulb  Canada
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Old 27th January 2010, 08:02 PM   #6
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The cabinet is identical to the HP Power Supplies of the era (Digital Voltage Sources) -- like the HP6131, or the Digital Current Source.

It's interesting to note that you could inject an audio signal into these power supplies and have it amplified out the rear end -- probably for amplifier stability testing. Fluke had the same feature.
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Old 27th January 2010, 08:11 PM   #7
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Quote:
Originally Posted by scott wurcer View Post
Thanks fun stuff, though I would think you could do better than MJ4502's today. I had a scope in almost that exact same case in the early 70's. A small publisher went belly up and at the auction one of the guys had left a scope under his desk, got it for $5.
Nice case, it would cost a fortune to manufacture today.

Speaking of the amp, I like that "half-diamond" buffers. They remind me when I was young...
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Old 28th January 2010, 02:30 AM   #8
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Default Sweet!

Quick look at the schematic says that Dan Meyer of SWTPC probably saw some of this, as there are some similarities to be seen...

The other thing is that i thought that Deane Jensen was the first to use small chokes in the legs of a diff pair - at least in audio, but this seems to predate the 990...

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Old 28th January 2010, 03:03 AM   #9
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While I have the greatest respect for Barney Oliver, I don't find this project terribly advanced, even for the late 1960's. We made similar power amps at Ampex in 1968, and
there was nothing exceptional about them, either. We also used the same parts.
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Old 28th January 2010, 03:10 AM   #10
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Bear, Dick Burwin used small chokes in his 1966 ADI hybrid op amp design. This also preceded Deane Jensen.
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