Please HELP!

wiseboy1900 · 6th February 2011, 11:54 AM

I want to know with what NPN transistor can I replace a 2sd718 from a car amplifier.I am sure it is broken.Please help me.
Thanks

jaycee · 6th February 2011, 12:17 PM

It's unwise to just substitute parts. If this is part of the output stage it is unlikely to be the only thing damaged.

If you want to replace the whole output stage, MJW21193/4 would be suitable.

AndrewT · 6th February 2011, 12:31 PM

It's shown as an fT=12MHz. & Cob=170pF, 80W, 120Vce0, 8A.

SOA is pretty poor ~750mA @ 60Vce

Is your amp full of Rgrade or Ograde?
What supply rail voltage does it use?
What load impedance is recommended?
How many pairs are fitted to each mono half of the amplifier?

6th February 2011, 11:54 AM	#1
wiseboy1900 diyAudio Member Join Date: Jan 2010	Please HELP! I want to know with what NPN transistor can I replace a 2sd718 from a car amplifier.I am sure it is broken.Please help me. Thanks

6th February 2011, 12:31 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	It's shown as an fT=12MHz. & Cob=170pF, 80W, 120Vce0, 8A. SOA is pretty poor ~750mA @ 60Vce Is your amp full of Rgrade or Ograde? What supply rail voltage does it use? What load impedance is recommended? How many pairs are fitted to each mono half of the amplifier? __________________ regards Andrew T.

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6th February 2011, 12:17 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	It's unwise to just substitute parts. If this is part of the output stage it is unlikely to be the only thing damaged. If you want to replace the whole output stage, MJW21193/4 would be suitable.

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