Question about Amplifiers & Preamps
BE AWARE OF FAKE TOSHIBA 2SC3281 & 2SA1302 SOLD ON EBAY. THEY WILL KEEP ON SHORT OUT THE CIRCUIT. ANOTHER SOLUTION IS, REPLACE THEM WITH MOTOROLA MJL3281A & MJL1302A.ALSO CHECK THE POWER SUPPLY FILTER ELECTROLYTIC CAPACITORS 2200MF/200V, WHEN CHECK THESE LARGE CAPACITOR, MAKE SURE TO DRAINED OUT BY SHORTED 2 TERMINAL WITH 1K RESISTOR BEFORE TESTED.
Posted on May 19, 2009
Try turning on the unit without the two transistors installed. Measure the DC voltages on the 3 pads to ground. These should read .6V,40V and 0, both +and -. If you read anything else, the driver circuit has a problem.
Posted on Mar 02, 2009
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