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Installing a Custom Load
A pair of gold plated screw terminals is available inside each of the
Nº32 phono preamplifier modules. It may be used to install a “custom”
resistor for phono cartridge loading, in the case where a value is desired
that not available from the existing set (3.3Ω, 5Ω, 7.7Ω, 10Ω, 33Ω,
50Ω, 77Ω, 100Ω, 330Ω or 47kΩ). These user input load terminals are
only accessible with the phono modules removed from the Nº32, since
they are internal to those modules.
Note: the user-installed resistor is electrically in parallel with 47k
Ω
. The
actual impedance at the input will be:
(47000Ω times your resistor value)÷(47000Ω plus your resistor value).
This distinction is usually not significant when your resistor value is below
a few thousand ohms.
Warning: Touch the metal enclosure of the module before
touching any component within the module to prevent
ESD (electrostatic discharge) damage.
If your phono modules are already installed in your Nº32, you will
need to remove them before you can access the custom-loading termi-
nals. Please see the instructions for Installing the Nº32 Reference Phono
Preamplifier Modules earlier in this manual to see how these modules
are installed and removed; removal is essentially the reverse order of
installation, except that you must always be ESD-protected and have a
reasonable work area in which to do the work.
To install user-selected, custom input loads: