Inputs - Classe Audio CP-40 Owner's Manual

INPUTS:

The input jacks are clearly marked on the back of the CP-40. The following inputs are
provided: PHONO/AUX, VIDEO, CD, TUNER, BALANCED, and TAPE.
PHONO/AUX:
The CP-40 preamplifier can be configured as a PHONO or LINE unit by setting the internal
jumpers (see fig.1, 2 & 3, Page 9). The PHONO and AUX share the same pair of RCA input jacks.
The followings steps should be performed to switch between them.
1) Make sure MUTE is ON (Steady GREEN)
2) Disconnect A.C. linecord from the wall outlet
3) Remove the top cover with the Allen key supplied.
4) Locate PHONO/AUX Input and Output jumpers (see fig.1, Page 9). Switch to desired
type of input (see fig.2 & 3, Page 9).
PHONO INPUT:
When switched to PHONO the input can accommodate both magnetic and moving coil
cartridges of varying output levels. Set the jumpers (see fig.1, 4 & 5, Page 9 & 10) to MM for
magnetic or MC for a moving coil cartridge. In the MC position, gain of the Moving Coil stage is
factory preset at 23dB which matches perfectly with most typical MC cartridges. With the resistor
kit (included), the gain can be adjusted from 13dB to 41dB, in order to optimise system gain, and
low noise while using other less typical MC cartridges. (Note: The MC gain is in addition to the
standard MM gain of 38dB). To change the MC gain, proceed as follows:
1) Make sure MUTE is ON (Steady GREEN)
2) Disconnect A.C. linecord from the wall outlet
3) Remove the top cover with the Allen key supplied
4) Locate R104 and R204 (see fig.1, Page 9), which are the MC gain setting resistors for the
LEFT and RIGHT channels respectively. Remove the resistors and replace them with newly
selected ones, according to the following chart:
GAIN COLOR CODED RESISTOR
13dB (Brown,Red,Purple,Brown,Brown)
23db (standard)(Yellow,White,White,Brown,Brown)
29db (Brown,Black,Black,Red,Brown)
35dB (Red,Black,Black,Red,Black)
41dB (Yellow,Purple,Green,Red,Brown)
Silver solder is provided in the kit for this purpose. The resistor kit is for setting the MC gain which
will optimise output levels, noise, and efficiencies of less typical cartridges.
5) Having completed the resistor changes, replace the top cover.
AUX INPUT:
When selected (see Fig.1 & 3, Page 9) the AUX input serves as an additional high level
input, accommodating additional sources such as VIDEO, CD, TUNER, etc..
(or) NUMERICAL RESISTOR
1271
4991
1002
2002
4752
6