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all-audio.pro
Riaa amplifier schematic circuit
The Groovewatt RIAA phono preamp uses four 12AX7 (ECC83) tubes and a Schematic - Groovewatt Tube (Valve) RIAA Phono Preamp Dc Circuit, Circuit Diagram. The voltage gain of the second RIAA preamplifier circuit is 40db at 1KHz. The harmonic distortion is less than % for the entire audio spectrum as long.
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