Sutherland Hubble User Manual download pdf (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.

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Sutherland Hubble User Manual Page 6