INSTALLATION
Because of the number and type of vacuum tubes used, the PV7 dissipates a
significant amount of heat (approximately 30 watts). It is essential therefore, that
proper attention be paid to ventilation. The unit should be mounted horizontally on a
flat hard surface so that the ventilation holes in the bottom are unobstructed. At least
three inches of clearance should be provided above the unit and the cabinet or shelf
should be open at the back. Vertical installation is not recommend.
To minimize hum pickup, keep the unit well away from the power amplifier, and
route power cords away from input cables.
THE PV7 IS TO BE OPERATED ONLY ON AC LINE VOLTAGE OF 108 to 125
VOLTS, 50 or 60 HZ
In any system of audio electronics minute leakage currents from the ac line
transformers will flow in the signal ground connections between preamplifier and
amplifier. These currents can intermodulate with the signal and affect the clarity of
sound. Generally, one orientation of the line cord will provide much lower current
flows. When combined with the finest associated equipment this effect is clearly
audible with the PV7. After installing the unit try reversing the line cord at the wall
outlet to pick the most satisfactory orientation.
