EMP Tek VT-40.2 - Manual (Page 4)

Vacuum Tubes
Most of the maintenance on your amplifier will involve the vacuum tubes. The tubes
used in the VT40.2 are type 6N3. The tubes have a lifespan up to approximately 5 years
of outstanding performance depending on usage. Tube wear is gradual and usually goes
unnoticed until new replacements are installed. Worn tubes tend to sound flat with
reduced punch, clarity and high end. Symptoms of failing vacuum tubes may include:
• Any intermittent noise
• Excessive hum
• Excessive white noise
• Inability to get a clean sound
• Loss of power
If the outer plates of a tube begin to glow brightly, this tube has shorted. Turn off the
amplifier and replace the tubes, preferably with a matched set. It is okay in an emergency
to replace only one tube, but both tubes should be replaced with a matched set. These
tubes have been tested and matched according to their power and performance
characteristics. A matched set of power tubes will significantly lower audible hum and
increase power output and clarity in sound.
Replace Tubes By:
1. Turn off power at switch.
2. Unplug amplifier from the power source.
3. Using a glove or clean dry cloth, carefully remove the tubes
from their sockets by pulling them straight up.
4. Insert a new set of tubes using a glove or dry cloth.
NOTE: New tubes can be purchased from EMP Tek at www.emptek.com
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Features
• Classic tube pre-amplifier design principals reduce odd-order harmonic distortion.
• Tubes provide a “sweet” pure and accurate sound.
• Connections for Subwoofer, iPod/MP3, CD/DVD and an additional Auxiliary component.
• 40 Watts per channel output easily drives most speakers.
• High quality machined aluminum case looks beautiful and aids in heat dissipation.
• Blue highlighted vacuum tubes in stylish protective cages for added visual elegance.
• High quality binding posts for secure connections of up to 12-gauge wire.
• Hand-painted and polished beautiful front accent panel.
• Power supply housing machined of solid aluminum, black anodized.
• Stable rubber feet add style and vibration damping.