Manley MASTERINGROOM STANDARD REFERENCE PREAMPLIFIER - Manual (Page 8)

OPERATIONAL NOTES
SWITCHING ON
The power switch is located on the right hand corner of the front panel. Flip the switch up to turn on
the preamplifier and down to turn off the preamplifier.
RUNNING
It is not recommended that you leave your preamplifier permanently switched on. This only wastes
electricity and tube life. Your preamplifier has solid state rectification and reaches peak operating
condition in approximately 30 minutes.
TUBE LIFE
As with all tubes, their quality degrades with age. This is due to cathode emission, a natural process
found in all tubes. We recommend that you have your preamplifier checked every 4-5 years,
depending on usage, usually the preamplifier will require re-tubing after this time has elapsed.
OPERATION
There are six possible source selctions to choose from, labled from phono to video. Be certain that
the volume is turned completely down when switching between source components, failure to do so
may send unwanted noise to your amplfier and damage your system!
The preamplifier can provide a maximum of 20 dB gain in the line stage when set at full and a
maximum of 15 dB when set at reduced. The MM(moving magnet phono) stage will supply another
40 dB of gain to that of the line stage (total of 60 dB max.); and the MC (moving coil phono) stage
will supply another 50 dB to the line stage.
The balance control is set to reduce the gain of each corresponding channel by a maximum of 10 dB.