VHT Amplification 2150 - FRONT PANEL CONTROLS; Standby Switch; Volume Control; Presence Control

CONTROLS & FUNCTIONS
FRONT PANEL
1 STANDBY: Disconnects power to individual channels when idling.
2150: I = on 0 = standby
CLASSIC: I = half power 0 = standby II = full power
After turning the power on, wait a few minutes before turning the standby on. In this way, you can warm up the
amplifier before applying full voltage to the tubes. This helps the tubes and other components to last longer. Tube
life will also be extended if, during breaks, the standby switch is used to turn the amplifier off instead of the power
switch. This keeps the tubes at a stable temperature and maintains the amplifier in a constant state of readiness.
2 VOLUME: Normal setting for best signal-to-noise ratio is between 12 o’clock and 2 o’clock.
3 PRESENCE: High-frequency boost/cut. The higher the frequency, the more active this control appears to be.
4 DEPTH: Variable damping control. The lower the frequency, the more active this control appears to be.
A WORD ABOUT DAMPING. Damping is a function of audio amplifier design that controls or inhibits speaker-cone
excursion at low frequencies. Turning the Depth control clockwise decreases the amp’s damping factor and thereby
increases the apparent low-frequency response of the amp/speaker system. This effect is more pronounced at high-
er volume settings. Different speaker systems also cause this function to behave differently. Experiment!
5 FAN SPEED: Adjusts cooling rate. Set to “Hi” for most playing situations. The “S” symbol on the switch is the
position indicator.
6 9 A FUSE, B FUSE: These are 1-amp “normal-blo” fuses. They are the individual DC power supply and
output protection fuses for channel A and channel B. *NOTE:
The 2150 uses flameproof fuses.
CAUTION
TO REDUCE RISK OF FIRE, REPLACE ONLY WITH THE SAME TYPE FUSE. DISCONNECT
POWER BEFORE CHANGING THE FUSE.
7 MAINS: This is the primary AC power switch for both channels and the fan; “I” = on, “0” = off.
8 MAINS FUSE: This is a 10-amp “slo-blo” type fuse. It is the primary AC protection fuse for both channels
and the fan.
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