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

JC-1 | Cartridge Preamplifier | 1976 - 1977

The JC-1 came in two versions, the -DC, battery powered and the -AC version, with an external power supply.
It seems that some models use modules (eg. black boxes) some don't.

It was (of course) was designed by John Curl.

This page is for the JC1, you can also have alook at the following pages:

• the JC1-DC
• and the JC1-AC