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.

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You can contact me through this form.

St├ęphane.
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

    ReplyDelete
  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

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

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

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

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

    ReplyDelete
  4. Does anyone know what brand switches were used for the mono/stereo and high/low gain switches? Thanks

    ReplyDelete