For a dirtier sound, the MASTER volume control enables the preamplifiers to be
overdriven without having the amplifier at full volume. Pull out the MASTER volume control
to activate the circuit, then turn the control fully counter-clockwise. No sound will come
from the amplifier at this point. Now turn the volume control of the channel you are using
fully clockwise or nearly so. Turn the Master volume control clockwise until sound is
produced from the speakers. Experiment with the settings of both the channel volume
control and the MASTER volume control until the desired results are achieved. Remember,
if the channel volume control (on either channel) is “cranked” up, and the MASTER
volume is turned down, an over-driven sound is produced. Experiment with both controls
simultaneously to understand more fully how their interaction affects overdrive
characteristics.
By using the Channel volume, Master volume and the Hi-Lo power setting switch, a wide
range of tonal spectra may be explored. Once again, let experimentation be the mother of invention!
CUT:
The CUT control varies the bandwidth, or high frequency response of the power
amplifier. This is characterized by fewer heights or less top end. The CUT control is used to
soften or take the edge off a harsh instrument or tone setting. The effect is subtle before the
halfway point on the control and increases the amount of cut from midpoint to full. The CUT
control is most effective when the Master volume is bypassed or set for maximum gain.
MAINTENANCE
Aside from routine vacuum tube and indicator lamp replacement, your
MATCHLESS should require very little in the way of maintenance. Periodically
examine the four output tubes visible from the rear of the chassis. Any tendency of
one or more of these tubes glow reddish in the plate area is an indication of an
imbalance in the amplifier. This should be checked out by a technician or by
substituting a fresh set of matched output tubes. If over a period of time or hard
playing the amplifier sounds weak or dull, this may be an indication that the output or
preamp tubes are “tired” and probably need renewal. If one or more of the preamp
tubes become abnormally microphonic or the amplifier whistles with the controls at
maximum (with nothing plugged into the inputs) a replacement may be required.
When replacing output tubes, make sure they are a matched quartet. Adjusting the
Bias is not necessary.
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