Sutherland Hubble - Manual (Page 6)

OPERATION
Initial Set Up
Release the top cover by removing the eight knurled screws on the
bottom plate. Audio boards are located on the left side of the
enclosure. On the left side of each circuit board you will find headers
for receiving the plug-in configuration boards. The Hubble is shipped
with a cartridge loading of 100 Ohms and a gain of 60 dB. If you wish
to change those values, locate the appropriately labeled plug-in board.
Each board carries two values and can be installed in one of two
orientations. Orient the board so the value you want has the writing
in the up position. Loading boards plug into headers toward the rear.
Gain setting boards plug into centrally located headers. Legends
printed on the circuit board clearly indicate position and function.
It is 100% OK and 100% safe to operate the Hubble with the top cover
removed. You may wish to leave the cover off when experimenting
with various configuration possibilities. There are no dangerous
voltages exposed with the cover removed.
Gain Options
45 dB or 50 dB
55 db or 60 dB
Loading Options
No card installed for 47.5 k Ohm
10 k Ohms or 4.75 k Ohms
1 k Ohms or 475 Ohms
200 Ohms or 100 Ohms
A blank plug-in board is furnished. Any desired loading
resistor and/or capacitor can be soldered to it. Install
identical values in both the upper and lower positions.
i.e. same values for each preamp channel.