2SA1668 PDF

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Only replace the power transistors that have actually failed. Testing them is the way to identify what has failed.

Note that there are more counterfeit power transistors of this style on the market than genuine parts. The 2SC and 2SA transistors are not voltage regulators, nor do they have anything to do with voltage regulators. One pair is used as emitter followers to drive the output transistors in a Darlington configuration and one is used as a voltage amp in the VAS. Again, these and the emitter resistors in both the drivers and outputs plus R11, R40 and every part in the VI limited must also be tested.

This amp should be powered up through a variac as well as the supply being current limited. Before power up, the bias control should be set for minimum output stage bias. Click to expand Yes they are not voltage regulaters. I miss spoke on that. Bad terminolgy on my part. You can replace only 1 transister but generally they will fail down the road becouse they are not from the same lot. Ive seen this many times. Its what fender, peavey, mackie have told me to do.

Also yes power up with variac. Mine doesnt have amp control so I have it wired in with a lightbulb. Much like replacing caps after 10 or 20 years because they might go bad.

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