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US 5,546,046 AGranted
Output tube bias selection apparatus for tone alteration in a tube-type audio amplifier
OwnerSalvatore J. Trentinoinventor
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Abstract
A tonal altering feature for a tube type guitar audio amplifier provides apparatus enabling the selection of the method of output tube bias.
Claims2
An output tube bias selection apparatus for tone alteration in a tube-type audio amplifier comprising:
- at least one output tube having an output tube control grid and an output tube cathode;
- a C- power supply, said C- power supply having a plus side which is grounded;
- a B+ power supply, said B+ power supply having a minus side which is grounded;
- and
- bias switch means for selectively connecting the output tube control grid through a bias resistor to said C- power supply, and the output tube cathode to ground for fixed bias, or alternatively selectively connecting the output tube control grid to ground through a bias resistor, and the output tube cathode to ground through a resistor for cathode (self) bias.
2 more elements
Dependencies are inferred from the claim text.