Direct box employing hybrid vacuum tube and solid state circuitr

Details Direct box employing hybrid vacuum tube and solid state circuitr Direct box employing hybrid vacuum tube and solid state circuitr

1993-02-16

1994-08-30

Mullins, James B.

Amplifiers

With plural diverse-type amplifying devices

330 85, 381120, 381121, H03F 500

Patent

active

053431596

ABSTRACT:
The direct coupled solid state-vacuum tube hybrid circuit matches a high impedance audio source to a low impedance audio destination. The resulting device supplies essentially unit gain and has both single ended and balanced outputs. The solid state operational amplifier and vacuum tube devices are DC coupled and supplied from a common low voltage DC power supply. The vacuum tube is incorporated directly in the feedback loop of the operational amplifier and a suitably chosen dampening resistor allows the circuit to provide vacuum tube characteristic warming effects without unwanted distortion or tube microphonics.

REFERENCES:
patent: 3005164 (1956-02-01), Newbold
patent: 5022305 (1991-06-01), Butler

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