VAC Signature Preamplifier Mk I - Manual (Page 8)

Mute: This knob is spring loaded; moving the control clockwise will toggle between the
“Mute” and “Operate” condition. When muted, the VAC logo will be red; when un-muted,
it will be blue. On occasion the preamplifier may seem not to have responded to a turn of
the “Mute” knob; this is due to “contact bounce” in the switch. Simply turn the knob again
until the desired condition is attained.
Meters: The power supply has two backlit meters. One monitors the output voltage of the
heater supply to the line stage, the other monitors the high voltage supply to the line stage.
These will vary somewhat due to power line voltage, and, to a lesser degree, tube
condition. The target condition has the needle aligned with the ball indication in the center.
REMOTE CONTROL
The remote control allows for wireless adjustment of SELECTOR, MUTE, and VOLUME.
The remote wand is powered by two “AAA” batteries. These should be of the alkaline
type. You will need to install them in the wand before using the remote. Since batteries can
leak, they should be removed from the wand if it is not going to be used for an extended
period of time.
Selector Up/Down: Pressing the left side of this button causes a motor to turn the selector
switch in the counter-clockwise direction. Pressing the right side of this button causes the
selector to turn clockwise. If the control ever stops midway between two settings, merely
push the button again.
Mute: Pressing either side of the “Mute” button will toggle between the “Mute” and
“Operate” condition. When muted, a red glow will be observed in the LED indicator. Mute
is automatically engaged when the preamplifier is first switched on.
Volume Up/Down: These buttons cause a motor to turn the volume control; the more
briefly you press the control, the smaller the motion of the volume control. Motorized
controls offer superior sound, as well as direct visual indication of volume setting. The front
panel control may also be used directly in the conventional way.