Marklev.com Revival !

I'm glad to announce that the website hosted under the name "marklev.com" since 1999, which I had to shutdown a few years ago, will slowly come back to life here.

The structure of the website will be simple : each equipment will have its own blog entry, pages will be used for categories.

Please do not hesitate to leave comments!

The IMF Electronics (loudspeakers) website which used to be hosted under marklev.com is at http://www.imf-electronics.com, check it out please !

You can contact me through this form.

Stéphane.
Paris, France, May 2014.

Friday, May 10, 2013

JC-2 | Preamplifier | 1974 - 1977


As its name indicates this preamplifier was designed by John Curl.

It's one of the earliest design of MLAS, and the ML-1 can be considered as an upgrade of the JC-2, it retains the modular architecture. You should have a look at both pages to get the complete information.

Module switches

See ML-1 description.

System Rocker Switch Function Open Closed
A3
1
2
input impedance
gain
100K
30dB
50K
40dB
D5
1
2
CRC
gain
CRC out
54dB
CRC in
60dB
D6
1
2
CRC
gain
CRC out
60dB
CRC in
66dB

Schematics

The ML-1 uses the same design : a phono (pre-preamplifier) is inserted at the beginning of the signal path by the input selector. Then the signal goes directly to the  output amplifier module.
Note that the 2 op amps symbols internal cicuitry is described on the right side.



Specifications

They can be found in this Italian brochure.



Pictures









7 comments:

  1. I have a Mark Levinson JC-2 (#1456) which seems to have a defective power supply. I also have line driver cards for moving coil and moving magnet. As I am not able to obtain a replacement power supply or find a repair method, I am going to either sell the entire unit (cords, cards, power supply and JC-2) or part out the unit. Any thoughts? lectric168@gmail.com

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  2. I have a Mark Levinson JC-2 (#1456) which the power supply has failed. I have been unable to find a repair or replacement for the PS and will either sell all (spare cards for moving magnet and moving coil) or part out. It is complete with cables, etc.Thoughts? lectric168@gmail.com

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    Replies
    1. In my JC-2#1050, power supply failed. So I changed it for "TRACO TMS25215F".

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  3. What is your asking price for your JC-2?
    thanks

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