On Monday, February 15, 2016 at 2:16:36 AM UTC-5, Phil Allison wrote:
Trevor Wilson wrote:



Is there anywhere a list of generic transistor/darlington for AF push
pull output stages from eg 10 W to 100 W in the different configurations.
I have to repair some amplifier but do not find the old powertransistor.
Idem for the drivers.

On Internet I can find some information (Eliot, Sams, wiki...) but no
global ones.



**Use the originals where possible. Sourcing approximate replacements
can be very time-consuming.


** What drivel.

There is normally no need to use original part numbers for output and driver transistors or darlingtons. By using more modern devices, you upgrade the equipment as you repair it.

Types like MJ15003/4 and MJ15024/25 replace can nearly any TO3 power transistor.

TO220 outputs can usually be replaced by 2N3055Ts and MJ2955Ts with advantages in power dissipation and current ratings.

Nearly all TO220 drivers can be relaced by MJE15030/31 or MJE15032/33.

MJE34s and MJE350s cover the TO126 pack size for drivers.

2SC5200s and 2SA1943s cover a huge range of large flat pack types, with advantages.

Try sourcing obsolete types to match what was used in the 70s or 80s and you will get sold substitutes or fakes.

Motorola brand ( or ON) MJ802s, MJ4502s and 2N3773s sold today are not - they are just relabelled MJ15003/4s and MJ15024s.


.... Phil

Phil:

Perhaps down-under that last statement is true. But here in the US, adjacent to Mexico, ON is still a viable brand. Whether they re-label or not in actuality, they *say* not. In any case, those I have purchased through Mouser have been very, very good.

http://www.mouser.com/ProductDetail/...BzeBPp6OfDaMjI

Peter Wieck
Melrose Park, PA