VHT G-2150-S

VHT power amplifier incorporates a unique combination of state-of-the-art
electronics and time-honored audio design. Meticulous craftsmanship coupled with only
the highest-quality components assures decades of trouble-free performance.


SPECIFICATIONS:
* Power Output: 105 watts RMS per channel
100 watts per channel, both driven simultaneously

Four KT88/6550A output tubes, two per channel

Two 12AT7 driver tubes, one per channel

Two 12AX7 preamp tubes, one per channel

* Input Impedance: 100k ohm

*Input Sensitivity: Switchable -10dBV to 0dBV

* Output Impedance: Selectable to 4, 8, and 16 ohms

* Power Requirements: 117 Volts AC, 60 Hz, 6 amps max, 700 watts max

* Dimensions: Height, 7" (4 rack spaces), Width, 19", Depth, 12",

* Weight, 53 lbs

* Front-Panel Features: Power switch, mains fuse, DC fuse for each channel, presence control for each
channel, depth (variable damping) control for each channel, standby switch for
each channel, fan speed switch

* Rear-Panel Features: AC input, impedance selector for each channel, parallel output jacks for each
channel, voicing switch for each channel, input jacks, input sensitivity switch


CONTROLS & FUNCTIONS:

FRONT PANEL
1 STANDBY: Disconnects power to individual channels when idling.
2150: I = on 0 = standby

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 higher
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.

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.

REAR PANEL
1 VOLTAGE RATING: This plate indicates proper voltage rating of the unit.

2 MAINS: AC input socket. See Installation & Operation.
This amplifier is equipped with a grounding-type supply cord to reduce the possibility of leakage
current. Be sure to connect it to a grounded receptacle. Operation from an ungrounded (twopronged)
AC receptacle requires a 3-to-2-contact grounding-type adapter. Be sure to connect the
adapter’s grounding lead to a good earth ground. DO NOT ALTER THE AC PLUG.

3 MODE (Classic series only): This switch changes the operation of the EL34 output tubes, which use five
components inside each tube. With this switch in the up position, the tubes run in the Pentode
mode, and all five components operate for full 100-watt power. The sound is brighter and crisper.

With the switch in the down position, the tubes run in the Triode mode, and three components
operate for 50-watt maximum power. The sound is smoother with a little less edge. Experiment!

4 IMPEDANCE SELECT: The impedance of a speaker or combination of speakers must equal the value
set on the “Impedance Select” switch for each channel. See Installation & Operation.

5 6 SPEAKER OUTPUT: The speaker output jacks are wired in parallel. Channel will not operate
unless the jack labeled “Use First” is used first!

7 VOICING: Position “1” voicing produces smooth, open midrange with soft highs and slightly rolled off low
end. Position “2” voicing produces sharper highs, punchier midrange, and beefier low end.

8 10 INPUT A/MONO AND B: Input signal is fed to the input sensitivity switch, then to the volume control.
Signal fed to the “A/MONO” input automatically “normals” (connects directly) to the B input when the B
input jack is not connected. (Both channels’ outputs must still be connected to separate speaker systems.)
If only one channel is being used, set the unused channel’s standby switch to the off (“0”) position.

9 INPUT SENSITIVITY:
Hi = -10dB This is the most frequently used setting.
Lo = 0dB Use for high signal levels such as “slaving.”

11 MODEL NUMBER: This is important information for reference.

12 SERIAL NUMBER: This is important information for servicing.

13 FAN: The fan’s speed is controlled by the front-panel switch. Keep the area around the fan and cooling vents
clear at all times.