Hello all, I have a driver board on my AU-9500 that is in need of a replacement pair of output transistors (2SC783 and 2SA483). Already took a chance on a pair off of eBay, shiny, new and DEAD. So now I am looking for suggestions from the experts on any equivalent replacements that may be had from Digikey or Mouser, etc.
Suitable replacements for output transistors 2SC783 and 2SA483
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The TO-66 package is long obsolete, the only sensible option is to use transistors with a package, i.e. TO-220, that was designed to directly replace TO-66 devices in the mechanical sense.
It's been done many times including here on AK, if you do a search for AU-9500 restorations you might be able to find the details, but it is quite simple to do. TO-220 replacements with adequate electrical characteristics have been given by avionic above.
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There is some text (sorry no pictures) in this thread:-
https://audiokarma.org/forums/index...um-on-one-channel.873149/page-8#post-12918006
Regarding replacing original TO-66 devices with TO-220 devices.
There is a link in that thread, in post #145 by @stereofun
to a thread of his that does contain pictures. 
https://audiokarma.org/forums/index...um-on-one-channel.873149/page-8#post-12918006
Regarding replacing original TO-66 devices with TO-220 devices.
There is a link in that thread, in post #145 by @stereofun
to a thread of his that does contain pictures. 
The Main thing to keep in min is that the tab on the TO-220 is the collector, as is the case on the to-66. And the electrical connection is the screws. Some times only one of the original screws are connected. And in both, usually need mica or equivalent insulation. My 2 cents.