The Fisher 400 and 500B (not 500C) are the most interesting amp I heard. They sorely need upgrade to Russian K40Y-9 caps including the tone controls and the one per channel damn ceramic cap in the audio chain. These amps (receivers) are far from the most clear sounding even after the upgrade, but the most pleasing amp on Rock & Roll. Live recordings are not placing you in the first 6 rows of seats, but at the 20th seat or so from the stage. The reverberation is just outstanding. You cannot hear the reverberation well on a stock Fisher 400 or 500 receiver. For some reason I am just mesmerized by the sound of these amps on rock and roll. They even sound good with cheap Chinese 12AX7WA tubes. I owned about 30 rebuilt vintage amps and none play as pleasing as these Fishers. Not for classical music, but best on hard Rock & Roll. Scott makes cleaner sounding tube amps, but not a Fisher sound. My 2 cents.