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US5498997A - Transformerless audio amplifier - Google …
https://patents.google.com/patent/US5498997A/en
A transformerless solid state audio amplifier which exhibits the superior linearity and saturation characteristics of a triode vacuum tube amplifier, and which has an output impedance which...
US6437648B1 - Audio amplifier with transformerless …
https://patents.google.com/patent/US6437648B1/en
US6437648B1 - Audio amplifier with transformerless power supply - Google Patents. In a high-fidelity, high-power audio amplifier, the power supply …
AES E-Library » A New Transformerless Amplifier Circuit
https://www.aes.org/e-lib/browse.cfm?elib=88
abstract={a transformerless amplifer is described using four tubes connected in a bridge circuit and so driven that each tube delivers equal power to a common load. the ac equivalent circuit of the amplifier may be represented by a generator of voltage 2µe(symbol) in series with the plate resistance rp of one tube. the amplifier is characterized by wide frequency response, low …
Audio amplifier with transformerless power supply - VAN ...
https://www.freepatentsonline.com/6437648.html
Output transformerless amplifier impedance matching apparatus: 1997-03-18: Berning: 330/10: 5604461: Transformerless output vacuum tube audio amplifier: 1997-02-18: Rozenblit: 330/81: 5499154: Protective shut-down system for switch-mode power supply: 1996-03-12: Cullison: 361/18: 5498997: Transformerless audio amplifier: 1996-03-12: Schiebold: 330/277: 5424683
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