Luxman L-120a w blown transistors. Help needed.

[Jonas83]

hi guys!

Got this Luxman L-120a with damaged transistors.
It is sanken C2581/A1106, seems to be quite hard to find? Out of stock etc.

Replacement? Any suggestions?. Found some sumitomo(!?) transistors but are they ok?
And..... How to bias this one? Changing the pots i will do.

[ilimzn]

Any of these will perform admirably:
2SC3263/2SA1294, 2SC3519(A)/2SA1386(A) from Sanken, and I would preferably use those amongst other things because of higher specs.
As alternatives which are often easyer to find, you might look at:
2SA1186/2SC2837, 2SA1941/2SC5198, 2SB817/2SD1047, these are closer to the original specs.
Do not forget to change the driver transistors and the bias generator (Vbe multiplier) transistor! They might seem OK and even be Ok but if there's anything wrong the output stage will fry again.

[Jonas83]

That helped me alot, thanks. placing an order on 3263/1294 asap. Will bring the beast down checking out the driver and generator transistor (the four w cooling sinks?) for model and throw in those new to.

I´am definetly no expert on this type of circuits, i think i need to figure out how this comes together in order to not fry it again = P. never seen a emitter resistor w 3 legs like that....

[sakis]

you may check yor local Yamaha dealer ..... they sell this in matched pairs made by sanken and in the best of quality .... of course ou will need to change the working ones also just for reasons of symmetry ... then again you will need to verify ofset and idle values

once more verify that all the resto of parts is working properly that will be fusible resistors and most imp[ortand all small electrolytic capacitors ....