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Remember. Patents | |
| 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. |