Digest for sci.electronics.repair@googlegroups.com - 3 updates in 3 topics

9:57 AM Penedão
mittra@juno.com: Apr 15 07:46AM -0700

Thanks again. Your pointers led (pun intended) me to the exact matches I am looking for:
 
http://www.mouser.com/ProductDetail/OSRAM-Opto-Semiconductors/SFH-4543-Z/?qs=sGAEpiMZZMtjb30GAx%2fDT3jQ62O9d7JBKHaQ61B6eFo%3d
 
and
 
http://www.mouser.com/ProductDetail/OSRAM-Opto-Semiconductors/SFH-4542-Z/?qs=sGAEpiMZZMtjb30GAx%2fDT3jQ62O9d7JBrV7lNTCZQLY%3d
 
Greatly appreciated.
 
"Ian Field" <gangprobing.alien@ntlworld.com>: Apr 14 10:01PM +0100

"Bruce Esquibel" <bje@ripco.com> wrote in message
news:nela1a$pso$1@remote5bge0.ripco.com...
 
> A freind of mine got stuck with one of those things (this was 2008/09) and
> that V5505 is like the cheapest/low performance laptop for "business use",
> whatever the fuck that means.
 
Its basically for reading PDF e-books on the bog.
Tim Schwartz <tim@bristolnj.com>: Apr 14 03:43PM -0400

> I have an older QSC model 1400 in with some blown output transistors (uses 8 per channel). Original outputs are Toshiba 2SD424 and B554. QSC doesn't sell parts for this amp any longer because of it's age. Is there a reliable source of these outputs, or should I replace them all with something newer?
 
Hello,
 
Toshiba discontinued these years ago, and anything on the market today
is likely to be a 'fake'. I would tend to use a device like the these
from Motorola/ ON Semiconductor:
 
For the 2SD424 use an MJ15024G
 
2SD424 spec:180V 15A 150W 40-140 beta. 5Mhz
 
MJ15024 spec: 250V 16A 250W 15-60 beta. 4Mhz
 
The PNP compliments are 2SB554 and MJ15025G.
 
Order genuine On Semi ones from a source like Mouser or Digikey for
around $6. If you have the ability to, then I would try to beta match
each bank of NPN's and PNP's. It is not as important that the betas of
the NPN's match the PNP's. OnSemi is not a consistent as the old
Toshiba devices, where all of the transistors of a lot number were quite
close in beta.
 
CHECK THE BIAS CIRCUIT, or you might be replacing them twice.
 
Regards,
Tim Schwartz
Bristol Electronics
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