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Mike1948 · 12th Aug 2017, 11:06 pm

Well, I seem to have got there in the end. One faulty AC128 I believe, as although I replaced it and the AC176 to no avail, it appears that the AC176 replacement was not good (old one turned out to be OK), and the first of the AC128's I tried was also not good. However, a second AC128 coupled with the original AC176 worked OK after checking the quiescent current....
Maybe cheap transistors not a good buy (they were very cheap). I wonder if they were untested? Perhaps I need to check them before using them. Any tips on that?
Thanks for all your help and suggestions, and your patience dealing with a novice!
Mike

12th Aug 2017, 11:06 pm	#11
Mike1948 Retired Dormant Member Join Date: Aug 2017 Location: Chippenham, Wiltshire, UK. Posts: 5	Re: SRP51/SRP52 problem Well, I seem to have got there in the end. One faulty AC128 I believe, as although I replaced it and the AC176 to no avail, it appears that the AC176 replacement was not good (old one turned out to be OK), and the first of the AC128's I tried was also not good. However, a second AC128 coupled with the original AC176 worked OK after checking the quiescent current.... Maybe cheap transistors not a good buy (they were very cheap). I wonder if they were untested? Perhaps I need to check them before using them. Any tips on that? Thanks for all your help and suggestions, and your patience dealing with a novice! Mike