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Guitar Amp
Circuit Philosophy
The VANDAL guitar amp offers three different pre-amp modes and two switchable
end stage models. This basic configuration may be changed via the wrench
symbol on the right side of the amp.
The pre-amp has three modes of operation:
 Classic (think Fender, early Marshalls, or the first Mesa/Boogie amps)
 British (oriented on Marshall Super Lead / "Plexi")
 Modern High Gain (design similar to "souped-up" amps like Rectifier, Soldano or Peavey
6505)
More about pre-amp modes and their properties resulting from channel selection can be
found in the chapter "Pre-amp Channels" (view page 761).
The last stage has two modes:
 Class A, low power: A simple, low-performance, but musically pleasant distortion. In
"A" mode, only a half-wave of the signal is amplified. To do this, the signal is brought to
approximately half of the amplification range of the end tube(s) through bias voltage,
because tubes always amplify only a half-wave of an alternating circuit. A class-A circuit
may be put together using only a few components and sounds very "warm" because of
its constantly asymmetrical characteristic curve shape (some even harmonics appear).
This amplifier, however has the disadvantage of low efficiency or low output performance