🚀 go-pugleaf

In article <5119@tekigm2.MEN.TEK.COM> neals@tekigm2.MEN.TEK.COM (Neal Sedell) writes:
>Ok, how about this problem.  I have two Radio S* PA amps, 30 or so Watts,
>cheap little things, that have both output trannys shorted.  Clearly
>marked on the packages is "D 1046", which I assume to mean 2SD1046, but
>there seems to be no crossreference anywhere that lists the D or 2SD type.
>By anywhere I mean the Moto power tranny book and Radio S*'s own reference.
>They're almost certainly NPNs, and they drive an output xfrmr (I assume
>center-tapped since they're both NPNs) with a 40V or so power supply.
>They're in what looks like a TO 220 case on steroids ;-).
>
>Anybody got any ideas?  A local little-league will surely appreciate it!
>-- 
># Neal Sedell

Neal, this is a Japanese silicon type beast manufactured by Matshushita 
Electronics. Try to get their manual. For fixing your problem, just plug 
in a 3 amp npn from Moto or such and you should be cruising. Remember, you 
gotta change 'em both and get the junctions right ar they'll pop again.
If the change makes the transistors seem hotter than normal, play very
carefully with the skeleton potentiometer situated near the power drivers.
This is the feedback control for the thermal runaway circuit.
Bring it to a point where it gets moderately warm and slightly above the
point where the speakers start to crackle. Mostly none of this will ever
be necessary, just replacing the transistor will be sufficient.

On a second thought, don't mess with it. Just put in direct equivalents.