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The high-gain and low-gain phono options offer internally selectable
cartridge loading via four single-pole miniature rocker switches, one
for each channel. The high-gain and low-gain options have been
factory-adjusted at 825Ω and 47KΩ, 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.
Switch 30Ω 100Ω 825Ω 10KΩ Optional
#1 On Off Off Off Off
#2 Off On Off Off Off
#3 Off Off On Off Off
#4 Off Off Off Off On
Switch 825Ω 10KΩ 22KΩ 47KΩ Optional
#1 On Off Off Off Off
#2 Off On Off Off Off
#3 Off Off On Off Off
#4 Off Off Off Off On
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.
Cartridge loading settings
(high-gain option)
Internal adjustments:
cartridge loading
Cartridge loading settings
(low-gain option)
Optional load
component
Solder
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.
Internal adjustments:
optional load terminals
Terminating the
optional load