SPEC-1 - Pioneer Preamplifier One Of The Best Old Vintage Stereo Preamps. Repair Restoration Testing

A Pioneer SPEC-1 stereo preamplifier repair and restoration video. Known as one of the best old vintage preamps. The power supply, input circuit, mixing amplifier, filter amplifier, and tone amplifier assemblies along with the fuse board in this Pioneer SPEC-1 preamp were completely rebuilt. This Pioneer SPEC-1 was then bench tested. This was a top to bottom repair and restoration that after 40 years of service this vintage amplifier needed. This Pioneer SPEC-1 preamplifier now sounds great and will be reliable for decades to come. 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