Pioneer SPEC-1Launched two years after the Exclusive C3 in Japan as a would-be Exclusive, the 1975 C-77 became for the export markets the famed SPEC-1 preamplifier in 1977.Circuit-wise, the SPEC-1 is an all-Class A SEPPdesign : phono, flat amp, tone controls and output, three stages every time.The flat amp has a PNP differential amplifier with 3-stage DC class-A SEPP circuit, with a±48V split power supply and 100% DC negative response in the first-stage feed input and output buffers to raise input and lower output impedances.The all-important phono stage is also fed by two±48V supplies to ensure a high overload level of 500mV at 1Khz.

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