Transistor substitutes Optonica sa-5905

[Aiden T]

Working on this rare beast that has blown both driver boards and i am looking for same hard to find transistor substitutes.
2sb717
2sd757
2sb719
2sd759

Also looking to find some information on the dual 5 pin transistors that are used
2sa995
2sa979
2sc2259
2sc2291
Any help would appreciated

 

[michigannick]

I have seen some information out there.. but have not done validation myself for (2sb717/2sd757) i had seen ONE .. post on diyaudio (2sa1535a/2sc3944a) but no further discussion or validation on that item: https://www.diyaudio.com/forums/solid-state/137849-1300dc-restoration-print.html and here on AK there are a few like : https://audiokarma.org/forums/index.php?threads/2sd757-c-2sb717-c-transistors.24020/ do you have the beta groups for the items above that may help track thing's down a bit EchoWars discusses it a bit there in Post 5: https://audiokarma.org/forums/index.php?threads/2sd757-c-2sb717-c-transistors.24020/#post-205533 But given the age of these posts .. likely the replacements are going to need replacements as well.

 

[michigannick]

I have seen some information out there.. but have not done validation myself for (2sb717/2sd757) i had seen ONE .. post on diyaudio (2sa1535a/2sc3944a) but no further discussion or validation on that item: https://www.diyaudio.com/forums/solid-state/137849-1300dc-restoration-print.html and here on AK there are a few like : https://audiokarma.org/forums/index.php?threads/2sd757-c-2sb717-c-transistors.24020/ do you have the beta groups for the items above that may help track thing's down a bit EchoWars discusses it a bit there in Post 5: https://audiokarma.org/forums/index.php?threads/2sd757-c-2sb717-c-transistors.24020/#post-205533 But given the age of these posts .. likely the replacements are going to need replacements as well.

for sure what i see here is pretty old news, you are going to need someone more updated to help you sort this one out.

 

[ivandezande]

Working on this rare beast that has blown both driver boards and i am looking for same hard to find transistor substitutes.
2sb717
2sd757
2sb719
2sd759

Also looking to find some information on the dual 5 pin transistors that are used
2sa995
2sa979
2sc2259
2sc2291
Any help would appreciated

Not sure on the first four. Might have to guess and check.
The 5 pins are x2 KSC1845 and KSA992, either connected at the emitter or collector. Unless they're getting noisy, I'd leave them.

 

[eizner23]

Not sure where your located, Consolidated in the US has 3 of first 4 you listed, here is link to 2sd759

http://www.ceitron.com/cart/advanced_search_result.php?keywords=2sd759