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2sd828 2sd932 2sd1050

SYK3S

SYK3S

Active Member
hi can anyone chime in as where i can find these illusive transistors its for a pioneer sa 3000 ideally a 2sd828 is needed but the 932 and 1050 are equivalents that can work but i cant find anywhere if anyone can chime in please
Thanks
Sykes
 
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That doesn't look right. The 828 is a darlington transistor with a 500 volt rating. The manual calls for a 2sd848 which is just a standard Bipolar but using the same case.
 
SYK3S said:
Yes my apologies i ment 2sd848
Click to expand...

Then the equivalents you listed won't work. They stopped making those years ago. So if you haven't already done so, check them with your meter to make sure they really do need replaced.
Also check all of the interconnecting passive components such as the emitter resistors ect.. Plus check the driver transistors as well. If you miss any bad components, the new outputs will likely get damaged. As far as replacement outputs, anything you might find claiming to be new are going to be counterfeit, and likely cause problems.
You'll need to do a conversion to a different transistor case style for a replacement. There is nothing new available that will directly mount in place, the mounting screw holes aren't spaced properly. I would go with a single hole mounting. The metal angle brackets would no longer be used. You should be able to use a TO-3P package (shown below). You can use a 2SC2837 for the 2sd848, and a 2SA1186 for the other. Make sure to get the proper mica insulators.
TO-3P_gif.gif

Pin-out looks to be the same, but spacing between leads is larger. So they wouldn't be a direct fit on the board. You could make up a short 3 lead harness, on the transistor end solder the leads fairly close to the transistor, cut the excess pin length, then put a piece of heat shrink tube over the pins. Then pull the original transistor socket on the PC board, and simply wire them directly to the board, through the existing holes. Dont get too lengthy with the wires. As for transistor mounting, you might be able to use one of the existing holes and mount them horizontally, with the pins on both transistors pointing towards each other. But I don't know for sure, if the existing holes are centered enough on the mounting area, for the transistor to make full contact to the sink. You might have to drill a new mounting hole. Just make sure to observe proper transistor pin out, so that the transistor doesn't get improperly connected to the board.

Hope this helps.
 
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