Impedance adapter preamplifier device for electronic tube...

Electrical audio signal processing systems and devices – With amplifier

Reexamination Certificate

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Reexamination Certificate

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07046814

ABSTRACT:
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 transmitting low frequency signals and a receiver. The invention is characterised in that it comprises an low frequency amplifier sub-part having high impedance at the source whereto it is connected, and having a low impedance at the receiver whereto it is connected next. The high voltage power supply of the anodes of the low frequency device is produced by a working high frequency automatic cutting feed regulator feeding a voltage amplifying device. The automatic cutting feed regulator operates in direct current low voltage. The inventive device is particularly designed for sound boards and for sources of hi-fi installations, whether incorporated or not.

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patent: 4673888 (1987-06-01), Engelmann et al.
patent: 5343159 (1994-08-01), Butler
patent: 5526253 (1996-06-01), Duley
patent: 5550509 (1996-08-01), Trentino
patent: 5612646 (1997-03-01), Berning
patent: 5834977 (1998-11-01), Machara et al.
patent: 6140870 (2000-10-01), Cook
patent: 0862260 (1998-09-01), None

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