alpibucky wrote:



I have 2 amplifier to be repaired : the first one a scott a416 (i have
the schematics but in bad quality and with drawing errors).



** The full manuals is on the web.

http://elektrotanya.com/scott_a416_a.../download.html

The outputs are both Toshiba 2SC789, NPN 70V, 4A, 30W in TO220 pack.

MJE3055Ts will replace these with many advantages.

https://www.fairchildsemi.com/datash...J/MJE3055T.pdf


The second one is a Marantz superscope MS-30 (without schematic)


** Probably uses TO220s as well, so MJE3055Ts and MJE2955Ts are also you best options. Watch out for blown driver transistors.

I generally use BC639/640 for this kind of amp, be careful with the pin outs.


..... Phil