INSTALLATION
Because of the number and type of vacuum tubes used, the PV4 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 un-obstructed. 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 recommended.
To minimize hum pickup, keep the unit well away from the power amplifier, and
route power cords away from input cables.
THE PV4 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 PV4. After installing the unit try reversing the line cord
at the wall outlet to pick the most satisfactory orientation.
