dondoucette
Too Many Projects
I would change D111 also.
D111 tested fine but I suppose it makes sense to replace them both. Thanks for the part number.
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I would change D111 also.
You are intending to replace all six of these output transistors? Correct? Those 2 other A909's took a beating as well.
Yes sir I am, I have new MJ21193G and MJ21194G on hand just waiting for the other parts to arrive.
if you are replacing with a 2SA909 with the same hfe grading = noCan I replace just the 1 2SA909, or do I need to do all 6?
If I do 6 on one side, should I do the other channel also, and what sort of transistor matching is required on the outputs?
Thanks!if you are replacing with a 2SA909 with the same hfe grading = no
if you are replacing with MJ21193G, then you should use, as complementary pairs
TR116 - 118 2SC1586 O, Y NPN T03 MJ21194G
TR119-121 2SA909 O, Y PNP T03 MJ21193G
You do not need to match above.