Selectable power supply for audio amplifier
First Claim
1. A selectable power supply for use in a thermionic vacuum tube audio amplifier comprising:
- a power transformer having a first secondary coil for providing a first AC power voltage with a first volt-amp rating and a second secondary coil for providing a second AC power voltage with a second volt-amp rating that is different from the first volt-amp rating;
first rectifying means coupled to the first secondary coil for converting the power to a first rectified DC plate voltage,second rectifying means coupled to the second secondary coil for converting the power to a second rectified DC plate voltage,filter means coupled to the first and second rectifying means for reducing the ripple component of one of the first or second rectified DC plate voltage to thereby present DC plate voltage adapted to supply at least one vacuum thermionic element of an audio amplifier; and
user-selectable switch means for selectively interrupting the rectified DC plate voltage presented at the filter means.
1 Assignment
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Accused Products
Abstract
The disclosure is directed to power supplies for audio amplifiers that focus on the importance of certain power supply characteristics in forming the overall qualities of a tube amplifier. The power supplies may use a power transformer with two dissimilar and selectable secondary windings to supply the voltages for a single vacuum tube power amplifier (B+ voltages). The power supplies may also apply different rectifier characteristics to complement the use of multiple differing secondary windings. The power supplies may also use different capacitor bank options to filter ripple voltage. The power supplies may also use of coordinated grid-bias voltage adjustment that coincides with secondary winding selection. The power supplies may also use coordinated preamp bias voltage adjustment that coincides with secondary winding selection.
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Citations
17 Claims
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1. A selectable power supply for use in a thermionic vacuum tube audio amplifier comprising:
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a power transformer having a first secondary coil for providing a first AC power voltage with a first volt-amp rating and a second secondary coil for providing a second AC power voltage with a second volt-amp rating that is different from the first volt-amp rating; first rectifying means coupled to the first secondary coil for converting the power to a first rectified DC plate voltage, second rectifying means coupled to the second secondary coil for converting the power to a second rectified DC plate voltage, filter means coupled to the first and second rectifying means for reducing the ripple component of one of the first or second rectified DC plate voltage to thereby present DC plate voltage adapted to supply at least one vacuum thermionic element of an audio amplifier; and user-selectable switch means for selectively interrupting the rectified DC plate voltage presented at the filter means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A selectable power supply for use in an audio amplifier comprising:
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a power transformer having a first secondary coil for providing a first AC power voltage with a first volt-amp rating and a second secondary coil for providing a second AC power voltage with a second volt-amp rating that is different from the first volt-amp rating; first rectifying means coupled to the first secondary coil for converting the first AC power voltage to a first rectified DC plate voltage; first capacitive filter coupled to the first rectifying means for reducing the ripple component of the first rectified DC plate voltage; second rectifying means coupled to the second secondary coil for converting the second AC power voltage to a second rectified DC plate voltage; second capacitive filter coupled to the second rectifying means for reducing the ripple component of the second rectified DC plate voltage; a switch for selectively coupling either to the first capacitive filter or to the second capacitive filter; and a voltage divider coupled to the switch to thereby convert the rectified DC plate voltage of the selectively coupled capacitive filter into plural DC plate voltages adapted to bias active electronic elements of the audio amplifier. - View Dependent Claims (11, 12)
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13. A method of providing plate voltages for use in a vacuum thermionic audio amplifier comprising:
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providing a first AC power voltage; providing a second AC power voltage that is different from the first AC power voltage; selecting one of the first or second AC power voltages; rectifying the selected AC power voltage to thereby produce a rectified DC plate voltage; selecting one of a first or a second filter and coupling the selected filter to the rectified DC plate voltage to thereby reduce the ripple voltage of the rectified DC plate voltage; dividing the filtered rectified DC plate voltage into plural voltages adapted to supply at least one vacuum thermionic element of the audio amplifier; and providing the plural voltages at multiple outputs. - View Dependent Claims (14, 15, 16, 17)
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Specification