The high-gain and low-gain phono options offer internally selectable cartridge loading via two four-pole miniature rocker switches, one for each channel. The high-gain and low-gain options have been factoryadjusted at 825� and 47K�, respectively. If you wish to change the factory-adjusted cartridge loading, see "Making the internal adjustments;" refer to the table below for the proper switch positions for each load setting.
Cartridge loading settings (high-gain option)
Switch #1 #2 #3 #4
30� Off Off On Off
100� Off On Off Off
825� On Off Off Off
10K� Off Off Off Off
Optional Off Off Off On
Cartridge loading settings (low-gain option)
Switch #1 #2 #3 #4
825� Off Off On Off
10K� Off On Off Off
22K� On Off Off Off
47K� Off Off Off Off
Optional Off Off Off On
Internal adjustments: optional load terminals
Resistance values other than those listed above can be accommodated via the optional load terminals. Load resistors can be inserted into these terminals, allowing virtually any load desired.
Terminating the optional load
Solder
Optional load component
Solder
PC board
See "Making the internal adjustments;" refer to the "Cartridge loading settings" tables for the proper switch positions for the optional load. Because the inherent input resistance (all switches off) is in parallel with the optional load terminals, use this formula to calculate the actual resistor needed: R = 1/ (1/RD - X) RD = Desired resistance in ohms X = 0.00002 for Low-gain Phono Option, 0.0001 for High-gain Phono Option Note: We recommend precision metal-film resistors; see your Mark Levinson dealer.
