2
Always provide for adequate air circulation around the PGP-1A chassis. Tube based
equipment can run warm to hot!
Plug the line cord into the PGP-1A IEC power inlet and connect to a proper ac
power source. Set POWER switch to ON and power led indicator will light to show
unit is ready for operation. Allow a 2 minute warm up time.
OPERATION
Operation of the PEQ-1 is straight-forward and intuitive. A run down of the
front panel controls is discussed in this section.
30 dB PAD
A 30 dB attenuator pad can be switched into the 250 ohm input circuit to allow
for high level inputs when used as a bridging or instrument amplifier.
In the OUT position, the input is straight thru with no pad, The IN position
inserts the pad into the input circuit and builds out the input impedance to 10k.
It is useful with guitar or bass inputs, or other signal sources which need higher
Zin than 250 ohms.
TRS INPUT
For convenience, a standard one-quarter inch standard T-R-S phone plug is
provided for front panel input. This connector is wired in parallel with the rear
panel input XLR with tip (T) tied to the input XLR pin 2, S tied to pin 3 and S to
signal ground. Use this as an input jack if not using the rear XLR.
.
OUTPUT PHASE
This switch transposes the 600 ohm balanced output leads to allow phase reverse.
In the normal position the signal path is: positive on Input pin 2 causes positive
output on pin 2. In the reverse position the Output polarity is reversed.
DB GAIN and OUTPUT LEVEL
The system gain is selected with this switch in steps of 10 dB, from 30 to 60 dB.
Gain can be varied over a wide range from zero gain to +6 dB over the GAIN
switch setting with the OUTPUT LEVEL control.. Use the OUTPUT LEVEL to
set your operating level as required. In general, use the lowest GAIN switch
setting which suits your gain requirement,
VU switch
The VU meter can be switched off or can be set to indicate either standard +4 or
+10 reference for meter zero dB. Use as an aid in setting system levels. Lowest
system distortion is with this switch in the OFF position ( due to loading effects).
PHANTOM POWER
This switch controls the +48 volt phantom microphone power. In the ON position
power is supplied to the microphone via 6.8k resistors. The phantom power
control is interlocked with the 30 dB pad switch so that phantom power is
disabled when the 30 dB pad is IN. The yellow LED indicator above the phantom
power switch is lit when ever phantom power is enabled.
