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 RememberPatents
Number File Description
2243412 2243412.zip
(333 K)
L. Bruck 1941, VOLUME CONTROL. The volume control by regulation of a negative feedback level.
2256057 2256057.zip
(275 K)
W. VAN B. Roberts,1939. TONE CONTROL CIRCUIT.
2322558 2322558.zip
(290 K)
W.S. Bachmen, 1942. TONE CONTROL MEANS. Effective tone control of high frequencies.
2358428 2358428.zip
(303 K)
E.L.C. White, 1944. THERMIONIC VALVE AMPLIFIER CIRCUIT ARRANGEMENTS. The Push-Pull cathode follower with the valves series connection is described.
2423362 2423362.zip
(238 K)
J.R. Banker, 1943. FEED BACK CIRCUITS. Way of implementation of a feedback circuit.
2431973 2431973.zip
(483 K)
E.L.C. White, 1944. LINE AMPLIFIER FOR HIGQ-FREQUENCY ELECTRIC SIGNALS SUCH AS TELEVISION SIGNALS. For the audio gear these decisions are suitable also.
2477074 2477074.zip
(1226 K)
F.H. McIntosh 1948, WIDE-BAND AMPLIFIER COUPLING CIRCUIT. This patent, is one of the great inventions of tube engineering. Amplifiers with a cathode feedback and a combination of cathode and screen-grid feedback are described. The design of output transformers is shown.
2488567 2488567.zip
(257 K)
E.K.Stodola, 1945, ELECTRON TUBE POWER OUTPUT CIRCUIT FOR LOW IMPEDANCE LOADS. Improved cathode follower is a good basis for development of a high-quality OTL amplifier.
2651685 2651685.zip
(386 K)
N.B. Tharp, 1948. BALANCED CIRCUIT FOR RADIO APPARATUS. The way of automatic balancing of a current for power tubes is described. The circuits of balancing of the SE-cascade, for paralleling tubes and of the PP-stage are shown.
2680218 2680218.zip
(415 K)
H.I. Keroes, 1950. AUDIO TRANSFORMER. The invention relates generally to push-pull audio transformers, and more particularly to systems of relatively arranging the windings of audio transformers, to enable change of output impedance without change in performance.
2710312 2710312.zip
(413 K)
D. Hafler,H.I. Keroes 1955, ULTRA LINEAR AMPLIFIERS. The present invention relates generally to amplifiers, and more particularly to amplifiers capable of wide band linear response, operable with substantially no distortion produced by harmonic response or intermodulation over a wide dynamic range, and with excellent efficiency.
2751442 2751442.zip
(362 K)
R.W. Ketchledge, 1956. DISTORTIONLESS FEEDBACK AMPFLIFIER.
The original circuit using the auxiliary channel.
2761019 2761019.zip
(1334 K)
C.T. Hall, 1956. DIRECT COUPLED POWER AMPLIFIERS. The transformerless output amplifier is described. In the PP output stage a series connected vacuum tubes are used.
2773136 2773136.zip
(518 K)
J. Futterman, 1953. A transformerless high-fidelity low distortion amplifier system with a balanced push-pull output stage operating Class "B1"using series connected power tubes wherein each half of the output stage has its own power supply.
2791646 2791646.zip
(361 K)
H.I. Keroes, 1955. ELECTRICAL SYSTEM FOR ULTRALINEAR AMPLIFIER. The actual physical arrangement of windings and connection of the several windings of a push-pull output transformer for the ultra-linear stage is described.
2810025 2810025.zip
(302 K)
R.P. Clements, 1957. DIRECT COUPLED FEEDBACK AMPLIFIER. The SE and PP amplifiers with a feedback from the plate of a output tube on a grid of the driver tube is described.
2955261 2955261.zip
(518 K)
L.E. Edwards, 1956. High-quality audio amplifier containing a novel preamplifier and having an output stage connected in a push-pull cathode follower circuit.
3092783 3092783.zip
(1033 K)
E. H. Krohn, 1963. POWER AMPLIFIER. Transformerless power amplifier.
3123780 3123780.zip
(1199 K)
J. Futterman, 1960. High fidelity, high power amplifier of series-connected, push-pull type which has low output distortion, and which is suitable for directly driving low impedance loads.
3995226 3995226.zip
(50 K)
David W. Berning, 1976. AUDIO AMPLIFIER The hybrid amplifier using vacuum tubes in the output stage is shown. For driving of the output tubes the emitter followers are used. (Now, it is possible to achieve the best results if to use the source follower.)
4636740 4636740.zip
(83 K)
Dennis L. Kager, 1986. CONTROL CIRCUIT FOR VARYING POWER OUTPUT OF PUSH-PULL TUBE AMPLIFIERS. The biasing and control circuit incorporates both fixed and cathode biasing to allow output power to be varied without introducing distortion.
4647872 4647872.zip
(61 K)
William Z. Johnson 1985. A stabilized Cascode Amplifier Circuit wherein the grid or gate control of the second stage of the cascaded input is provided by feedback of a portion of an output signal voltage.
5017884 5017884.zip
(137 K)
Aado J. Perandi, 1991. VACUUM TUBE AND MOSFET TRANSIMPEDANCE AMPLIFIER. The hybrid amplifier using MOSFET in the output stage is shown.The present invention provides for an improved transimpedance amplifier having wider bandwidth and wider power bandwidth.
5302912 5302912.zip
(75 K)
Alan M. Grant, 1993. A high-performance, distortion-free audio amplifier with crossover distortion compensation and with extreme linearity at both high and low output levels; an amplifier has a class A driver stage that drives a class B push-pull output stage which is coupled to a load through a transformer that has a center tap primary with screen taps.
5500632 5500632.zip
(199 K)
Joseph G.Halser, III, 1994. A wide band audio transformer with multifilar winding for use with a push-pull vacuum tube amplifier; a common core is wounded with a multifilar ribbon in which primary windings and secondary windings co-exist.
5559496 5559496.zip
(47 K)
Randall C. Smith, 1996. VACUUM TUBE AMPLIFIER WITH SELECTABLE POWER DEVICES. A power output amplifier for use with electric guitar wherein the individual pairs of power tubes are of two or more differing types which may be selected by the user to operate alternately or simultaneously.
5604461 5604461.zip
(118 K)
Bruce M. Rozenblit, 1996. Transformerless audio power amplifier using a vacuum tube, series connected push-pull output stage for amplifying audio signals to drive a high fidelity loudspeaker.
5612646 5612646.zip
(97 K)
D.W. Berning,1997. OUTPUT TRANSFORMERLESS AMPLIFIER IMPEDANCE MATCHING APPARATUS. The interesting decision of a problem of the output transformer.
5680074 5680074.zip
(132 K)
Fujio Yamasita, 1997. TUBE AMPLIFIER HAVING SPECIFIC CONFIGURATION WITH FOUR TUBES.
SE amplifier without decoupling capacitors.
5705950 5705950.zip
(141 K)
Brent K. Butler, 1996. HYBRID SOLID STATE/VACUUM TUBE AUDIO AMPLIFIER. In this hybrid amplifier circuit the vacuum tube is direct coupled or DC coupled to the output of a solid state amplifier in a cathode follower configuration.Thus the hybrid circuit produces amplification at full volume and at low distortion even while the vacuum tube is warming up.
5838196 5838196.zip
(326 K)
Yasuo Yoshizawa, 1997. TRANSFORMER-COUPLED AMPLIFIER. The amplifier having the interstage transformer with compensation a quiescent current of a drive tube is described.
5859565 5859565.zip
(109 K)
Martin Reiffin, 1997. A high-fidelity vacuum tube cathode-follower power amplifier for driving a loudspeaker to provide music reproduction without audible distortion, wherein an output stage is driven by a novel drive stage to provide with low distortion the large signal required to drive the output stage.
5912585 5912585.zip
(118 K)
Kazutoshi Yamada, 1999. VACUUM TUBE AUDIO AMPLIFYING CIRCUIT. The SE direct coupled vacuum tube amplifying circuit with the stabilized operation is described. In the amplifier is enhancing the sound quality so that no capacitor should be placed in a circuit of a signal and the feedback loop.
6087822 6087822.zip
(193 K)
Menno van der Veen, 2000. POWER TRANSFORMER WITH INTERNAL DIFFERENTIAL MODE DISTORTION CANCELLATION. Interesting way of reduction of a power-line noise.
6111460 6111460.zip
(90 K)
F. Yamasita, 2000. VACUUM TUBE DIFFERENTIAL PREAMPLIFIER HAVING A TRANSFORMER WITH A CENTER TAP.
Vacuum tube differential preamplifier possible to prevent influence of noise components when there are noise components in power source.
6242977 6242977.zip
(126 K)
Ralph R. Karsten, 2001. AMPLIFIER AND PREAMPLIFIER CIRCUIT. The advanced version of the "Circlotron" circuit.
6265938 6265938.zip
(78 K)
Martin Reiffin, 2001. LINEAR HIGH-VOLTAGE DRIVE STAGE AND CATHODE-FOLLOWER HIGH-FIDELITY POWER AMPLIFIER IMPLEMENTING SAME.