Philbrick metal case op amps

nuppe · 4th December 2004, 10:41 AM

Hi there!

I have two old Philbrick Researches op-amps lying around that i'm curious about. One is a P65 and the other is a P45AU. Are these rare? I have no idea, but i have never seen anything like them before. From searching the net, i've gathered they were not meant for audio, but analog computing. I also read that these were among the first mass produced solid state op-amps.

I'm trying to decide wether to keep them or put them up on Ebay or something. If there is little demand, i'll probably stick them in a frame and hang them in the workshop, they are kind of stylish

.

What do you think, could they be valuable or do they only have sentimental value?

/Andreas

nemestra · 4th December 2004, 12:25 PM

Hi Andreas,

the noted analogue guru, Bob Pease, who writes for EDN magazine has written some comments on Philbrick Research op-amps.

See chapter 9 of Analog Circuit Design, edited by Jim Williams, Butterworth Heinemann, ISBN 0-7506-9166-2 (or -0 softcover) where Bob discribes the P2.

James

nuppe · 4th December 2004, 01:26 PM

Thanks!
I'll have a look if i can find it around these parts.

Btw, i found a Philbrick manual online, here, havent had time to browse it through yet.

/Andreas

4th December 2004, 10:41 AM	#1
nuppe diyAudio Member Join Date: Aug 2003 Location: Gothenburg	Philbrick metal case op amps Hi there! I have two old Philbrick Researches op-amps lying around that i'm curious about. One is a P65 and the other is a P45AU. Are these rare? I have no idea, but i have never seen anything like them before. From searching the net, i've gathered they were not meant for audio, but analog computing. I also read that these were among the first mass produced solid state op-amps. I'm trying to decide wether to keep them or put them up on Ebay or something. If there is little demand, i'll probably stick them in a frame and hang them in the workshop, they are kind of stylish . What do you think, could they be valuable or do they only have sentimental value? /Andreas

4th December 2004, 12:25 PM	#2
nemestra diyAudio Member Join Date: Jul 2002 Location: UK	More info on Philbrick Res. op-amps Hi Andreas, the noted analogue guru, Bob Pease, who writes for EDN magazine has written some comments on Philbrick Research op-amps. See chapter 9 of Analog Circuit Design, edited by Jim Williams, Butterworth Heinemann, ISBN 0-7506-9166-2 (or -0 softcover) where Bob discribes the P2. James

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4th December 2004, 01:26 PM	#3
nuppe diyAudio Member Join Date: Aug 2003 Location: Gothenburg	Thanks! I'll have a look if i can find it around these parts. Btw, i found a Philbrick manual online, here, havent had time to browse it through yet. /Andreas