The circuit of the 4-tube audio amplifier featured was found in the RCA Tube Manual, edition 1971. This excellent quality amplifier provides 15 W rms of power at 8 or 16 ohms loads, depending on the used transformer outlets. In addition to the valves, the critical components of the design are the transformers that must have the characteristics of the list of material maintained in English as the original. The amplifier has an auxiliary power output to power preamplifier circuits and mixers. Two similar channels will form an excellent hi-fidelity system.
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