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space_charged · 12th Jul 2019, 1:49 pm

Thanks for these thoughts. Yes it seems like the circuit is tightly designed around the 2SD625. Love the thought that it might also have been a specially selected 2SD625 - eeeek!
I do seem to remember from my holiday job in a radio and TV repair workshop that if it was a Sony then only the right/original part would do. I learned a lot from the experienced service engineers.

Thanks for the characteristics of the 2SD625. I got some data from the net and in particular from a well known site but I'm doubting the accuracy of some of what I read. In particular a minimum hfe of 120. Might have to resort to a characteristics plot.

Any thoughts on whether all the transistors in the set will be as critical?

12th Jul 2019, 1:49 pm	#18
space_charged Hexode Join Date: Dec 2014 Location: West Midlands, UK. Posts: 315	Re: Sony 2SD625 line output transistor Thanks for these thoughts. Yes it seems like the circuit is tightly designed around the 2SD625. Love the thought that it might also have been a specially selected 2SD625 - eeeek! I do seem to remember from my holiday job in a radio and TV repair workshop that if it was a Sony then only the right/original part would do. I learned a lot from the experienced service engineers. Thanks for the characteristics of the 2SD625. I got some data from the net and in particular from a well known site but I'm doubting the accuracy of some of what I read. In particular a minimum hfe of 120. Might have to resort to a characteristics plot. Any thoughts on whether all the transistors in the set will be as critical? Last edited by space_charged; 12th Jul 2019 at 2:12 pm.