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Used in conjunction with the left
and right input potentiometer
controls, this switch facilitates
playback of information from either
channel only or a variable mix of
both channels in mono or stereo.
3. Left and Right Input
Potentiometers
Input level gain for each channel
can be controlled via the left and
right input potentiometers on the
front panel. The scales of the input
potentiometers are calibrated in
logarithmic-scale and represent the
amplification of the input amplifier,
before the modulometer, for the
corresponding channel.
A clutch is provided so the
potentiometers can be used in
tandem or changed independently.
With the button turned to “oo”
position, both input potentiometers
move in tandem; with the button
turned to “oo” position, the input
potentiometers move
independently of each other.
4. Source/Tape Switch
A toggle switch to the right of the
input potentiometers controls the
tape loop or an external recorder or
signal processor.
When the switch is in the
“SOURCE”
position, input is sourced from the
input connectorsthrough the main
rotary switch. When the switch is in
the “TAPE” position, input is
sourced from the “FROM EXT”
connectors on the right side-panel.
5. Modulometer
A highly precise, Nagra-made
modulometer provides a multitude
of indications through 2 coaxial,
internal pointers representing the
left and right channels. The black
indicator pointer represents the left
channel and red is for the right
channel. Suggested uses of this
instrument are covered in the
Advanced Operations portion of
this manual, under “Using the
Modulometer” section.
6.
Modulometer Lamp /
Battery Check Switch
This is a 3-position switch. The
functions are as follows:
• In the upper position, it turns on
the modulometer lamp.
• In the middle position, it turns off
the modulometer lamp.
• When the PL-L is turned on, in
the momentary lower position,
the Volts per Cell reading of the
internal power cells is shown.
7. Output
Potentiometer
Output level gain for both channels
are controlled via the output
potentiometer.
The scale of the output
potentiometer is calibrated in
logarithmic-scale and represents
the amplification of the output
amplifier, after the modulometer,
for both channels.
