Marshall VS100R transistors

g1 · April 08, 2024, 08:08:34 PM

Yes it would seem T1 is bad as you verified R5 and D1. But you also need to check their solder connections.
As T1 and T2 form a differential amplifier, it is best to replace them as a pair.

markorock37 · April 13, 2024, 02:57:58 PM

I don't see 2SA872 on Mouser, is KSA992 a good sub?

g1 · April 13, 2024, 07:57:57 PM

Quote from: markorock37 on April 13, 2024, 02:57:58 PMI don't see 2SA872 on Mouser, is KSA992 a good sub?

Yes, those should work.

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Marshall VS100R transistors

g1

markorock37

g1