imation_nation
Member
It's up to you, but I would never buy semiconductor pulls from units being parted out - you are paying a lot of money and have no guarantees you are getting good parts. The power transistors in this unit are unexceptional, so you have no need to pursue originals.
Much better to replace the OP transistors with modern equivalents, Like this to replace the 2SA765 (PNP)
https://www.mouser.co.uk/ProductDetail/ON-Semiconductor/MJ21193G?qs=/ha2pyFaduhYR/YNuos/yPrr6J3ZPw3fA%2bbv/1AROoc=
And this, to replace the 2SC1445 (NPN)
https://www.mouser.co.uk/ProductDetail/ON-Semiconductor/MJ21194G?qs=/ha2pyFadujEihMqaz/hhkq6TQqOjR1kS1vnU717vwU=
These new replacements are cheap and are very robust, if you make a mistake and accidentally destroy one, easy to get and cheap to replace.
NB: I recommend you replace all four OP transistors.
Hi,
That is an interesting idea I had not thought of. I am not sure it would physically work though. The output transistors are plugged in to a socket which is attached to the heat sink.From what I saw based on the dimensions of the cases for the old vs new, I do not think the new would physically fit? Perhaps I am missing something. Isthere a work around for the dissimilar sizes?
Thanks for your assistance. This is quite the daunting task. It has been fun though.