Tube Works 1500 Owner's Manual

OWNER'S MANUAL
Congratulations on purchasing the most innovative audio amplifier on the market today. The
Model 1500 incorporates a patented MosValve circuit designed by B.K. Butler. The MosValve
power amplifier is a Class A design that emphasizes even order harmonics, which are very
pleasing to the human ear. This design makes the Model 1500 an excellent choice for instru-
ment amplification, including guitar, bass, keyboard and P.A.
This amplifier was designed primarily for musical instrument and sound reinforcement ampli-
fication. It is an addition to your audio rig which will add warmth and definition to your sound.
Use the MosValve 1500 with any preamp capable of producing 775 mV into a 20K load
(Virtually any preamp).
Use with speakers or cabinets capable of at least 250 watts RMS continuous power when
operating in stereo or two channel mono modes or when using a speaker or cabinet capable
of at least 400 watts RMS continuous power when operating in the mono one channel driven
mode.
MANUFACTURER IS NOT RESPONSIBLE FOR ANY SPEAKER FAILURE WHILE USING
THIS EQUIPMENT.
This is a stereo power amp. Mono operation is switchable (both input channels bridged)
with the use of Channel A inputs. Normal stereo operation is only possible with the rear-
panel switch set to "STEREO". NOTE: Channel B inputs are disabled when "MONO" mode
is used. Only Channel A inputs may be used in this mode.
? ? I t is often advisable to use only one channel for mono (for example, if you are using only
one speaker cabinet), as the 1500 will produce 380 watts into a 4 ohm load with only one
channel driven. Use Channel A, and set Channel B controls to "0". NOTE: It will not dam-
age Channel B to have no speaker plugged into it while using only Channel A.
The Presence control is "Flat" when set at "0". Turning the control clockwise increases high
frequency response, to a maximum of +15dB @ 10KHz. NEVER attempt to power bridge
the two speaker output channels together. NEVER parallel or series them into one speaker
or cabinet. If power from both channels is to be used, ALWAYS use at least two separate
speaker systems (one per channel). ALL WARRANTIES WILL IMMEDIATELY BECOME
VOID IF ANY ATTEMPT AT POWER BRIDGING OR SERIES/PARALELL OUTPUT CON-
NECTION IS MADE!
A certain amount of heat during operation is normal. The 1500 is biased in a manner in
which some heat will be present even while idling. It is best to keep the amp towards the
bottom of the rack (coolest air) and avoid blocking the vents on the case. NEVER DISABLE
THE FAN!
Do not connect loads lower than 4 ohms per channel. These can be singe speaker cabinets
per output or a combination of two cabinets per output.
1500
MosValve Power Amplifier