The Barney Oliver from Hewlett Packard

jackinnj · 27th January 2010, 07:25 PM

Sorry, only employees were allowed to purchase:

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.

scott wurcer · 07:47 PM

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.

forr · 27th January 2010, 07:55 PM

I presented this impressive amp yesterday on a french forum.

Cabinet de curiositÃ©s

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.

llwhtt · 27th January 2010, 07:59 PM

Very cool, love HP stuff. Do you own one?

Craig

paulb · 27th January 2010, 08:00 PM

What's a "G-job"?

jackinnj · 27th January 2010, 08:02 PM

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.

Wavebourn · 27th January 2010, 08:11 PM

Quote:

Originally Posted by scott wurcer

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...

bear · 28th January 2010, 02:30 AM

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...

_-_-bear

john curl · 28th January 2010, 03:03 AM

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.

john curl · 28th January 2010, 03:10 AM

Bear, Dick Burwin used small chokes in his 1966 ADI hybrid op amp design. This also preceded Deane Jensen.

27th January 2010, 07:25 PM	#1
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	The Barney Oliver from Hewlett Packard Sorry, only employees were allowed to purchase: 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.

27th January 2010, 07:44 PM	#2
scott wurcer diyAudio Member Join Date: Jan 2004 Location: cambridge ma	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. __________________ 2012, our time is running out. Last edited by scott wurcer; 27th January 2010 at 07:47 PM.

28th January 2010, 02:30 AM	#8
bear diyAudio Member Join Date: Apr 2002 Location: New York State USA	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... _-_-bear __________________ _-_-bear http://www.bearlabs.com ...ur feeback please - like/dislike my what I have written? PM/email tnx. --

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27th January 2010, 07:55 PM	#3
forr diyAudio Member Join Date: Dec 2004 Location: Next door	I presented this impressive amp yesterday on a french forum. Cabinet de curiositÃ©s 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.

27th January 2010, 07:59 PM	#4
llwhtt diyAudio Member Join Date: Jun 2008	Very cool, love HP stuff. Do you own one? Craig

27th January 2010, 08:00 PM	#5
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	What's a "G-job"?

27th January 2010, 08:02 PM	#6
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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.

28th January 2010, 03:03 AM	#9
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	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.

28th January 2010, 03:10 AM	#10
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Bear, Dick Burwin used small chokes in his 1966 ADI hybrid op amp design. This also preceded Deane Jensen.

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