model
101
owner’s manual
page 6
Turn the gain control fully counter-clockwise, turn the trim control fully
clockwise and check that the +48V phantom power is off.
Connect the microphone to the preamplifier and then turn on the phantom power
switch on if required. When sending a signal to a recorder that has fixed input
levels, simply increase the gain until the optimum recording level is reached.
When sending a signal to a tape recorder with a variable input, use the following procedure:
Turn the gain control fully counter-clockwise, turn the trim control fully clockwise.
Set the record level control on the recorder to 12 o’clock
or midway between minimum and maximum.
With the sound source present, turn the preamplifier gain control clockwise until the
peak LED begins flashing red, then reduce the gain until the red stops flashing.
NOTE- since red indicates a peak level which is 10dB before clipping,
it is OK for it to come on occasionally during recording.
Adjust the recorder input control for the optimum recording level.
Operation
Rackmounting
Trim Control
The trim control can be used for fine output level
adjustment as well as for level riding during recording. It
should be noted that the maximum output level of the
preamplifier is reduced by the amount of output attenuation
(trim control) being used. For instance, if the trim is set to
-6dB, the maximum output level of the preamplifier will
drop from +25dBu to +20dBu. Since the LED peak indicator
monitors signal level before the trim control it, will always
monitor the actual preamplifier headroom regardless of the
trim control setting. It is best to leave the trim control fully
clockwise for normal recording operations. This ensures that
the preamplifier will be operated at the minimum necessary
gain setting.
The model 101 chassis has a #10-32 threaded insert mounting
hole on the bottom towards the back. Two model 101s can be
mounted side by side in a standard 1U rack tray. Use a #10-32
x 1/2” or a #10-32 x 3/8” machine screw. Do not use a screw
longer than 1/2”.
chassis bottom view
(mounting hole)
Setting The Gain
