11
PHONO PREAMPLIFIER
Product Features
PHONO CARTRIDGE LOADING ADJUSTMENT
The phono cartridge load can be adjusted to suit your particular phono cartridge,
using the 8-way mini-switches labelled ‘LOADING’.
For all individual mini switches, when UP, the corresponding loading is OFF. When
DOWN, the corresponding loading is ON.
Switch ‘1’ is the adjustable input capacitance. With switch ‘1’ OFF the input capacitance
is 100pF for use with higher output Moving Magnet (MM) cartridges. With switch ‘1’ ON
the total input capacitance is 570pF. This is an optional setting as there may be some
additional interference rejection for lower output Moving Coil (MC) cartridges with
switch ‘1’ ON.
Switches ‘2’ through to ‘8’ allow the load impedance to be set to suit your particular
phono cartridge. Once the correct loading value has been determined, use the
corresponding mini-switch to set the load value to one of 22k, 1k, 470R, 220R, 100R,
47R, or 22R. With none of the switches ON, the loading will be set to 47k.
Please consult your cartridge manufacturer for specific recommendations.
PHONO GAIN ADJUSTMENT
The Koru Phono Preamplifier can also be set to one of four gain settings to suit your
phono turntable specifications using the 2-way mini-switches labelled ‘GAIN’. These
2-way mini-switches allow the gain to be adjusted as low as 50dB, to suit high output
Moving Magnet (MM) cartridges, or as high as 66dB for low output Moving Coil (MC)
cartridges. The four possible gain configurations are as follows:
For both individual mini switches, when UP, additional gain is OFF, when DOWN,
additional gain is ON.
Switch ‘1’ is the 6dB adjustment. With Switch ‘1’ ON there is an additional 6dB. Used
within the 50dB range this will increase the gain from 50dB to 56dB. Used within the
60dB range it will increase the gain from 60dB to 66dB.
