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Hi again dear friends, another repair that wants to share. When I opened to do some testing inside, begans with pwr supply voltages looking that the +-15 volts are incorrect and because these voltages feeds directly the input/preamp front panel board IC's, I disassembly to check and found the IC101 (NJM4558LD) and Q102 (2SC2240 GR) both in short, then changed them probe and OK. Checked & tested the rest and OK, ready sounding Very Good. THANKS!Edu.