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PURCHASED AT AN ESTATE SALE, I CHECKED ALL OF THE TUBES ON MY EICO 635 TUBE TESTER. ALL TUBES TESTED GOOD, NO SHORTS OR GRID LEAKAGE. THE RECTIFIER INCLUDED IS AN RCA 5U4GB MADE IN THE USA. THE 5U4GB SOUNDS GREAT AND YOU CAN ALSO USE A 5V4GT, OR 5AR4/GZ34 WITHOUT ISSUES. THE DRIVER TUBES ARE TWO, OLD STOCK, TUNG SOL, 7N7 TUBES, MADE IN THE USA. THERE IS ALSO A 12AX7 RIBBED BLACK PLATE, NO LABEL TUBE, ON THE AMPLIFIER CHASSIS. THE 12AX7 IS POSSIBLY USED AS A PHASE INVERTER. THIS AMP APPEARS TO BE CUSTOM MADE. IT IS A WILLIAMSON DESIGN, PUSH PULL, 807 MONO TUBE POWER AMPLIFIER. IT APPEARS TO BE SIMILAR TO AN EARLY HEATHKIT WA-1 OR WA-A1 807 MONO TUBE AMP. BOTH OF THE ALUMINUM CHASSIS ARE STAMPED UNDERNEATH IN BLACK INK WITH THE BUD RADIO INC. CLEVELAND, OHIO, MADE IN USA BRAND. BUD RADIO INC. WAS A MAJOR MANUFACTURER OF HAM RADIO PARTS. THE ALUMINUM CHASSIS IS PROBABLY THE ONLY PART THAT CAME FROM BUD RADIO INC. THE OUTPUT TRANSFORMER IS THE RENOWNED ACROSOUND TO-290. THE TWO PRIMARY POWER SUPPLY TRANSFORMERS ARE VERY HEAVY. THE ENTIRE POWER SUPPLY CHASSIS WEGHS APX. 16 LBS. THE AMPLIFIER CHASSIS WEIGHS APX 8 LBS AND IS CONNECTED TO THE POWER SUPPLY CHASSIS WITH THE ORIGINAL INTERCONNECT CABLE, WHICH HAS MESH INSULATION AND IS IN GOOD CONDITION. THIS AMPLIFIER SOUNDS VERY GOOD, TRANSPARENT, WARM, DETAILED, BASS IS CLEAN AND DEEP. THE SOUNSTAGE IS BROAD, DEEP AND TALL, VERY TRUE TO THE SOURCE. I BROUGHT IT UP GRADUALY ON A VARIAC TO REFORM THE CAPACITORS.THIS POWER AMP HAS NO VOLUME CONTROL AND REQUIRES A PREAMP TO OPERATE PROPERLY. THE AMP HAS A LOW-LEVEL HUM, WHICH IS AUDIBLE WITH NO INPUT SIGNAL. THE HUM BECOMES INAUDIBLE WITH LOW LEVEL MUSIC AT A DISTANCDE OF APX. 6 FEET FROM A SPEAKER. THE AUDIBILITY OF THE HUM WILL ULTIMATELY DEPEND UPON YOUR SPEAKERS, PREAMP, AND THE TYPE OF MUSIC. THE UNIT NEEDS TO BE RECAPPED TO ELIMINATE THE HUM, FOR SAFETY, AND TO IMPROVE RELIABILITY. EACH OF THE TWO WIRE LEADS ATTACHED TO THE 807 TUBE CAPS HAVE TWO AREAS THAT I TAPED TO COVER SMALL BREAKS IN THE ORIGINAL LEAD WIRE INSULATION. FOR SAFETY AND COSMETIC REASONS, BOTH WIRES SHOULD BE REPLACED. I USED THIS AMP WITH A HEATHKIT SP-2 TIUBE PREAMP FOR APX. 25 HOURS WITH NO ISSUES. ALL CAPACITORS, RESISTORS, TRANSFORMERS, AND WIRING APPEAR TO BE ORIGINAL. ALL TUBES ARE INCLUDED.ALL TEST GOOD ON MY EICO 635 EMMISIONS TUBE TESTER.NO SHORTS OR GRID LEAKS. (2) RATHEON USED OLD STOCK 807 POWER TUBES, MADE IN USA(2) TUNG SOL USED OLD STOCK 7N7 DRIVER TUBES, MADE IN USA(1) UNBRANDED 12AX7 LONG BLACK RIBBED PLATE, POSSIBLE A PHASE INVERTER(1) RCA USED OLD STOCK 5U4GB RECTIFIER TUBE, MADE IN USA * A 5AR4/GZ34 OR A 5V4GT RECTIFIER TUBE CAN ALSO BE USED WITHOUT ISSUES. I AM SELLING FOR PARTS OR NOT WORKING DUE TO THE LOW-LEVEL HUM. THE NEED TO RECAP, AND THE NEED TO REPLACE THE WIRE LEADS THAT GO TO THE 807 TUBE CAPS. SELLING AS-IS, NO WARRANTY STATED OR IMPLIED, THERE MAY BE UNKNOWN DEFECTS THAT HAVE BEEN NOT DISCOVERED, OR DEFECTS THAT COULD DEVELOP AT ANY TIME DUE TO AGE. NO WARRANTY ON THE TUBES, ALTHOUGH THEY TESTED GOOD PRIOR TO SHIPPING. I AM NOT A PROFFESIONAL TECHNICIAN AND I HAVE NOT CHECKED ANY OF THE INDIVIDUAL COMPONENTS, OTHER THAN THE VACUUM TUBES. A QUALIFIED TECHNICIAN NEEDS TO EVALUTE THIS AMP AND REPAIR IT TO INSURE SAFE AND RELIABLE OPERATION. NO RETURNS. I WILL INSURE FOR $400.00 FOR SHIPPING DAMAGE. REQUIRES PHOTOS AND OBVIOUS DAMAGE TO THE BOX AND THE AMP TO POSSIBLY COLLECT FROM THE SHIPPER FOR DAMAGE IN TRANSIT. ANY DAMAGE THAT OCCURS IN TRANSIT WILL BE BETWEEN YOU AND THE SHIPPER. I DO NOT COVER DAMAGE THAT OCCURS IN SHIPPING OR DUE TO IMPROPER USE. THE POWER SUPPLY, POWER AMPLIFIER, INTERCONNECT CABLE, AND ALL TUBES WILL BE VERY WELL PACKED IN ONE BOX.
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