Tube sound solid-state amplifier

Details Tube sound solid-state amplifier Tube sound solid-state amplifier

1989-10-17

1991-01-22

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, 330264, 330300, 381 61, H03F 345

Patent

active

049873814

ABSTRACT:
A closed loop bipolar transistor driver is coupled to an open loop MOSFET output stage. The closed loop driver amplifier operates within a higher voltage range than the open loop MOSFET output amplifier. The closed loop driver stage is capable of driving the MOSFET output stage into saturation and the MOSFET output stage thereby produces a desirable vacuum tube-like sound characterized by warm, even harmonics. Feedback is used to maintain the closed loop driver circuit in a linear operating regime thereby preventing undesirable hard clipping associated with bipolar transistors when they are overdriven.

REFERENCES:
patent: 3984781 (1976-10-01), Shizuhara
patent: 4345502 (1982-08-01), Jahns
Varenik et al., "Transistorized DC Amplifier for the Spin Stabilization System of an NMR Spectrometer," Instruments & Experimental Technology, vol. 15, No. 4, Jul.-Aug. 1972, pp. 1143-1145.

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