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1. a proper level for maximizing
signal-to-noise performance,
2. a proper balance between left
and right channels,
3. recorded level differences
between various recordings.
• Adjusting the tape loop internal
level-matching trim pots.
• With the correct adjustment of
the power amplifiers input, it can
be used to measure the output
level of the amplifier as well as a
very precise indication in the
event of saturation.
• Checking the reserve of the
internal power cells.
With both input and output potentiometers set at “0” on their respective
scales, a 1.0 V input signal at Line A, Line B or Line C input connectors
will register 0 dB on the modulometer scale and produce
a 1.0 V output signal at the output connectors.
Block Diagram
Output Customization, Tape Loop Input Adjustment
The PL-P is equipped with a tape loop for connection to the inputs and outputs
of tape recorders or other external signal processing equipment.
To select operations using the tape loop, select the “TAPE” position on the
Source/Tape switch on the front panel.
On the inside right of the PL-P case is a printed circuit board which is
connected to the input and output connectors of the tape loop. Above and next
to the connectors, marked “FROM EXT” on the right side-panel, is a pair of trim
pots, which are designed to be adjusted using the supplied miniature jeweler’s
screwdrivers.
This pair of trim pots is used to adjust the level of the tape loop input. With a
clockwise turn of the white adjustment screw in the center of the trim pot,
the input level is increased; with a counterclockwise, the level is decreased.
This adjustment technique is used to balance the levels to avoid variations
between the source and tape output levels. Used in conjunction with the
modulometer, as described above, the user can also maximize system
performance by selecting the optimum operating range for the tape loop input
and the PL-P.
