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The Jumpers on the PC Board
LINK JUMPER – If you wish to “Link” two or more PUMPs
for stereo operation, move the Link Jumper towards the rear
of the PCB position. The gain reduction will match,
preventing image shift in Stereo or surround applications.
DIFFERENTIAL OUT JUMPER – Changes output
configuration. This jumper sets the XLR output pin 3 to either
balanced ground, or the inverted phase of what’s on pin 2 of
the output XLR. It is set to the left, differential mode, from the
factory, adding 6 dB more gain. Setting the jumper to the right
(towards the rear) disconnects the amplifier on pin 3,
decreasing the output gain by 6dB.
The Saturator
The saturation circuit follows the compressor and tends to
catch high frequency peaks that get through, softly flattening
them out. It was largely tailored to simulate the characteristics
of tape saturation. Germanium semiconductors are used to
more smoothly round the peaks to produce lower order
harmonics. We use special filter circuits to shape how different
frequencies are soft clipped. The saturator will add lots of
harmonics to low frequencies and soften high frequencies.
Note: The Saturator (Sat) is heavily dependent on which Ratio
is selected. Generally, 8:1 and 10:1 will be slightly cleaner,
while 4:1 and 6:1 (etc.) have higher thresholds and will saturate
a little more quickly.
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