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Old 4th November 2008, 11:05 AM   #1
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Default '70s Mark Levinson Op-amp

Hi,

Whilst truffling around the 'web, I came across this company: http://www.conisis.com/english/doa/index.html

After 30 years, I wonder if anyone's seen a complete, authentic schematic?

How much does this link have in common with the op-amp:

http://www.marklev.com/JC2/jc2schematics.jpg


??? It looks pretty complete to me. Why is a 3rd party firm selling op-amps for a high price?

Justin
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Old 4th November 2008, 05:25 PM   #2
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This looks like a japanese firm.
The Japanese and the Chinese also, others as well, seem to like to clone and copy "classic circuits".
This appears to be another - although I didn't see the schematic itself. Is there one??

Pretty looking products...

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Old 4th November 2008, 05:30 PM   #3
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Default Re: '70s Mark Levinson Op-amp

Quote:
Originally posted by thermionic
Hi,

Whilst truffling around the 'web, I came across this company: http://www.conisis.com/english/doa/index.html

After 30 years, I wonder if anyone's seen a complete, authentic schematic?

How much does this link have in common with the op-amp:

http://www.marklev.com/JC2/jc2schematics.jpg


??? It looks pretty complete to me. Why is a 3rd party firm selling op-amps for a high price?

Justin

Pretty cool, huh?
read JC's thread for his latest thoughts.
John Curl's Blowtorch preamplifier
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Old 4th November 2008, 07:26 PM   #4
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Check the price out is that yen? 165,000yen that's around $1,500usd, that's why!!!!!!!!!!!!
It's just a buffer board with about $20 of parts on it.
They have a restorers thing going over there, where they'll pay anything for, just to get a classic going, and you don't have to be a tech to fit it, this is what their "banking" on

Cheers George
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Old 4th November 2008, 08:20 PM   #5
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It looks like they are doing a good job, although expensive.
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Old 5th November 2008, 07:18 PM   #6
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Maybe I didn't use the right search term before posting here. You can see a more comprehensive thread on this topic, including some lab analysis, here: The JC-2 preamp schematic on the website is wrong...Mr.John C?

That Japanese firm is quite unusual. Take their Neve knock-offs for example; instead of cloning the gear everyone wants, i.e. the discrete stuff - 1066 /73 / 84 etc, they sell clones of the later V1 + V3 modules (not noted for sound quality, George Massenburg made a famous quote about them...not complimentary)... If you copy a '70s design you may get sued, but you can argue the copyright's expired... I'm not so sure about those Pope designs from the '80s...

(The 'V' in Neve's name protocol stands for 'Vatican', a pun on the designer's name, David Pope)

Maybe the Japanese firm should come up with a pun on the ML op-amp designer's name. Answers on a postcard please.


Justin
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