1. Make connections by stripping wire insulation back about 3/16". Twist any loose strands
tightly.
2. Insert the wires from the amplifier into the INPUT openings of the connector, hot to hot and
ground
to ground, then tighten screws. Check for stray wire strands that might cause a short circuit.
Make
sure the metal part of the screw connector engages the bare wire, NOT the insulation!
3. Similarly, connect speaker wires to the control OUTPUT openings and tighten screws.
4. Install control in its operating location. Suggestion: Leave control 3 or 4 positions CCW from
maximum before firing-up the system for the first time to avoid "blasting" the speakers, while
still having enough sound to observe operation.
Installation must be made by qualified service personnel, and must meet all local codes.
Attenuator type:
Tapped auto transformer.
Switch:
12 position rotary, make-before break contacts, low torque
specifications for smooth feel.
Connector:
Screw-tight type, removable.
Input Power Rating:
25 Watts RMS continuous, 35Hz-20KHz, 75 Watts
audio.
Core Saturation:
Studies reveal that core saturation @ 35 Hz is 25 W.
Transformer:
Tri-filar wound for flat response and minimum phase shift, grain
oriented, -34 dB in 12 steps, 8 steps @ -3 dB each, 1 step @ 4 dB,
1 step @ -6 dB, last step OFF.
Mounting:
Fits most single gang junction boxes.
INSTALLATION
Wiring the system is done identically to the manner of hooking up standard attenuators. The controls are
installed ONE PER SPEAKER and in parallel. Wiring may be such that one wire pair from the amplifier feeds the
system with each control connected like lamp sockets in a 120 volt AC house wiring system. Another common
approach is the "home run", where the wires from each control are individually brought to the amplifier, or a
junction box, and then to the amplifier. Either method works well, although line losses may be slightly less with
the "home run" system. DO NOT CONNECT CONTROLS IN SERIES! They will not operate properly.
VC75 MONO VOLUME CONTROL
TECHNOLOGY
INSTALLATION MANUAL
1999 - 4/20/99