Inputs - Classe Audio CP-50 Owner's Manual

INPUTS

The input jacks are clearly marked on the back of the CP-50. The following inputs are
provided: BAL 1, BAL 2, REG 1 (also used for Phono), REG 2, REG 3, REG 4, TAPE, and a
SURROUND sound loop. (see figure 3).
OPTIONAL INTERNAL PHONO FEATURE:
The REG 1 input jacks are to be used with the optional phono feature (see fig.6) The phono
ground screw is located between the REG 4 and TAPE IN jacks. The optional phono can
accommodate both magnetic and moving coil cartridges of various outputs. In the MC position, gain
of the Moving Coil stage is factory preset at 16dB which matches perfectly with most typical MC
cartridges. With the resistor kit included with the optional phono feature, the gain can also be
adjusted to 20db, 25db, or 30db in order to optimize system gain, and lower noise while using other
less typical MC cartridges. (Note: The MC gain is in addition to the standard MM gain of 42dB). To
change the MC gain, proceed as follows:
1. Disconnect A.C. linecord from the wall outlet.
2. Remove top cover with Allen key supplied.
3. Locate R245 and R145 (see fig.6), which are the MC gain setting resistors for the LEFT
and RIGHT channel respectively. Remove the resistors and replace them with newly selected ones,
according to the following chart.
GAIN
Standard: 16db
20db
25db
30db
4. Having completed the resistor changes, replace the top cover.
COLOR CODED RESISTOR
(Brown, Brown, Black, Black)
(Red, Black, Black, Black)
(Orange, Grey, Orange, Black)
(Violet, Blue, Grey, Black)
-6-
(or) NUMERICAL RESISTOR
1100 (110 ohms)
2000 (200 ohms)
3830 (383 ohms)
7680 (768 ohms)