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This tube is a dual triode where the A and B sides are closely matched for
use in critical high end audio applications or for use in the phase inverter or
driver position of musical instrument amplifiers.
The benefit of this tube in a guitar or bass amplifier is a matched output
section. At lower frequencies such as dropped tunings, 7 string guitars, or bass
guitars, the upper and lower portions of the output waveform will be much more
equal. When this waveform is not equal, differences are cancelled out in the NFB
loop of class A/B amplifiers and are noticed as a lack of sustain or apparent
"dead spots" in areas of the fret board.
At high levels at all frequencies, sustain will be improved. This is even
more critical in Class A amplifiers such as the Vox AC-30 and Matchless
amplifiers.
Use this MPI in any application where a phase inverter /
driver of the ECC81/12AT7 tube is specified. The phase inverter / driver position of
a guitar or bass amp is a current driving position, and not
part of the tone generation stage. These tubes are selected for specific characteristics, so they
may be a 12AT7A, 12AT7C, or other 12AT7
tubes.
Use of a 12AT7 in place of a 12AX7 will yield more clean headroom in your
output section. The two tube types are interchangable without any
adjustment required, so feel free to experiment!
Please contact GT SAG directly if you have any questions or specific
appplication requirements.
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