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| Number | Title | Issue Date |
| 7173488 | Vacuum tube power amplifier switchable between push-pull and single ended configurations A vacuum tube power amplifier with a user-operable switch and a single output transformer which selectively provides push-pull or single ended configurations for driving a loudspeaker. ... | 02/06/2007 |
| 7046814 | Impedance adapter preamplifier device for electronic tube audio frequencies able to be inserted on line on the path of the low frequency signal The invention concerns an online low frequency amplifying interface operating in automatic cutting feed, particularly designed for multimedia computers. It concerns a impedance adapting device produced around an electronic tube. It can be arranged between a source t... | 05/16/2006 |
| 6937093 | Cathode-coupled pentode valve amplifier with servo offset controlled push-pull output stage 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 r... | 08/30/2005 |
| 6507240 | Hybrid audio amplifier A musical amplifier that includes a vacuum tube and a transistor. The vacuum tube is connected to the gate of the transistor, so that the current flow through the transistor is controlled by the vacuum tube. According to one example of the invention, the ... | 01/14/2003 |
| 6265938 | Linear high-voltage drive stage and cathode-follower high-fidelity power amplifier implementing same A novel drive stage provides with low distortion a large amplitude signal, such as required for driving a cathode-follower output stage of a power amplifier. The drive stage comprises an amplification substage and a load substage. Each substage comprises ... | 07/24/2001 |
| 5859565 | Cathode-follower high-fidelity power amplifier A cathode-follower power output stage is driven by a novel drive stage to provide with low distortion the large signal required to drive the output stage. The drive stage comprises two series connected vacuum tubes which share the large static and dynamic... | 01/12/1999 |
