Amplifiers – Including a push-pull stage – Coupling to or from cathode in push-pull
Reexamination Certificate
2005-08-30
2005-08-30
Tokar, Michael (Department: 2819)
Amplifiers
Including a push-pull stage
Coupling to or from cathode in push-pull
C330S003000, C330S118000
Reexamination Certificate
active
06937093
ABSTRACT:
An amplifier is described including a pair of cathode-coupled pentode vacuum tubes. A first pentode of the pair includes a control grid configured to receive an input signal. A second pentode of the pair includes a control grid configured to be coupled to an input reference signal. A cascaded voltage regulator includes a first stage configured to generate a plate reference voltage for providing voltage to a plate of each pentode. The regulator includes a second stage configured to generate a screen reference voltage based on the plate reference voltage for providing voltage to a screen grid of each pentode. The amplifier can also include a push-pull output stage having a servo circuit configured to adjust the control bias signal for one of a pair of vacuum tubes included in the stage until the plate currents in the pair of tubes are substantially equal.
REFERENCES:
patent: 3995226 (1976-11-01), Berning
patent: 5302912 (1994-04-01), Grant
patent: 5546046 (1996-08-01), Trentino
patent: 6140870 (2000-10-01), Cook
patent: 6507240 (2003-01-01), Butler
Bretza, Ltd.
Burns Doane Swecker & Mathis L.L.P.
Nguyen Linh V
Tokar Michael
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