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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...
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 …
Output Transformerless Tube Headphone Amplifier ...
https://headwizememorial.wordpress.com/2018/03/19/output-transformerless-tube-headphone-amplifier/
Output Transformerless Tube Headphone Amplifier. – HeadWize Memorial. by Kurt Strain The tube headphone amplifier in figure 1 is a high current mu follower, with a 12AU7 cathode follower driven by a 6CG7. Both sections of each tube are paralleled to minimize noise. It's a zero global feedback, OTL design of pretty high quality.
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