![]() Sometimes they short or leak (electrically) which reduces the drive voltage and will cause the outputs to run hot. If the amp appears to be working properly, measure the voltage across the zeners. If there are zener diodes in the driver section, check them. If your amp has this type of circuit design, replace both parallel drivers at the same time.Ĭheck the other drivers in the area as well as the transistors that they drive (output FETs or power supply FETs). This means that the transistors must match very closely to assure equal current sharing. When used there, the transistors (a1023 or c1027) may be connected directly in parallel with no resistors. In some of the class D amps, the 2sa1023 and 2sc1027 transistors are used as drivers in the audio section. ![]() I've used the KEC brand with no problems.
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