Hello!
A pair of pre-driver transistors(2SA1015 and 2SC1815, TO92) that drives the pair of transistors (C907, Axxx, TO-220 package ) next to the last stage is heating up fast. All other transistors including output transistors behaves normal.
Note: Sound is not distorted or amp not in protect.
2 or 3 out of 4 channels encountered this heating problem. I replaced transistors, resistors, measured bias resistors but still NO LUCK.
Please help...
Thank you as always.
A pair of pre-driver transistors(2SA1015 and 2SC1815, TO92) that drives the pair of transistors (C907, Axxx, TO-220 package ) next to the last stage is heating up fast. All other transistors including output transistors behaves normal.
Note: Sound is not distorted or amp not in protect.
2 or 3 out of 4 channels encountered this heating problem. I replaced transistors, resistors, measured bias resistors but still NO LUCK.
Please help...
Thank you as always.
Last edited:
Thanks. but most amplifier with this rails uses 20volt part example Infinity reference and JBL amps....
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