Page
10
PHONO
GROUND
- For connection of your ground wire for phono use.
POWER
CONNECTION
- For connection of the included power supply. **
Caution must be taken when connecting the included power supply. Do
not force the plug as you may damage the pins inside the preamplifier.
The plug is keyed so you can only insert it in one orientation.
**NOTE - USE ONLY B&K COMPONENTS POWER SUPPLY.
Phono Stage
Configuring
Select Moving Magnet (MM) or Moving Coil (MC)
1.
Locate the 2 position push button switch on the inside of the unit (see figure 1). It is located near
the back left side. The switch can be identified by a metal tab at the end which indicates whether
MM or MC is selected.
2.
Push the switch in to select the type of phono stage that is desired (MM/MC). The switch
“toggles” the selected stage between MM and MC each time the switch is depressed.
NOTE
: The PRO10 is shipped from the factory with the phono stage set to the MM configuration and a
resistive loading of 50 Kohms. Selecting the MC stage without changing the resistive loading will result in
an effective load of 133 ohms.
Capacitive Loading
NOTE:
The PRO10 is shipped from the factory with no capacitor installed. Typically, the
capacitance of the phono cables (C
phono
cables
) is sufficient and no capacitor is needed.
1.
Determine the capacitor value (pF) for proper loading of the MM cartridge in accordance with
the specifications of the cartridge you have selected. A recommended value may be suggested by
the manufacturer of the cartridge. The capacitive loading affects both the MM and MC stage.
The capacitance (C
load
) should be:
C
load
= C
cartridge
- C
phono cables
- 75 pF
2.
Locate the 2 gold-plated pin receptacles with the label “CLOAD” between them on the inside of
the unit (see figure 1). They are located near the left end of the circuit board. Near the MM/MC
