PIONEER A-51 (SAME AS THE A-777) 100 WATTS/CHANNEL ELITE REFERENCE STEREO INTREGRATED AMPLIFIER. THIS IS A VERY WELL MADE UNIT WITH ALL COPPER COATED SCREWS AND WEIGHING IN AT ALMOST 42 POUNDS. THIS UNIT HAS MONO BLOCK DUEL TRANSFORMERS AND PARALLEL PUSH PULL OUTPUT TRANSISTORS HENCE THE TRUE 100 WATTS BUT TESTS AS HAVING 115 WATTS.I TESTED EVERYTHING ALL INPUTS AND OUTPUTS AND THEY ALL WORK INCLUDING ALL POTS AND SWITCHES WITH NO KNOWN ISSUES ...OR PROBLEMS.I PLAYED THIS AT HALF POWER WITH A FM STATION FOR 2-3 HOURS IT SOUNDED GREAT AND DIDN'T MISS A BEAT.CLEANED ALL POTS AND SWITCHES TO BE SURE.COSMETICALLY ITS 9/10 JUST A COUPLE OF VERY SMALL NICKS AND VERY CLEAN INSIDE AND OUT WITH ALL ORIGINAL KNOBS.INCLUDED ARE COPIES OF THE OWNERS AND SERVICE MANUALS.BEING USED ELECTRONICS THERE IS NO WARRENTY OR RETURNS.UNIT WEIGHS 47# PACKED HENCE HIGH SHIPPING COST TO ME AND A BENIFIT FOR YOU.WILL SHIP FEDEX GROUND LOWER 48 ONLY FOR FREE NO INTERNATIONAL BIDDING OR SHIPPING AS I GOT BIT ON DOING THAT BEFORE.GOOD LUCK AND HAPPY BIDDING.