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Good day, Need help with power output. Nad 200 is fitted with 2x2SB557 and 2x2SD427 per channels. All output and drivers were shorted on one channel blowing the 5 amp fuse. Order some on eBay and they were junk from China... Do gave me a great sound but did not resist passing more than a few...

Chatted with Mouser or Digikey and they dont have any matched pair's... Is matched pair's a must?

I will do that and see how it goes. Thanks for your help. Alain

Thanks for you're reply, Already went to hifiengine but this is not the service manual and there's no schematic. Voltage was looking ok prior to going ac comparing with the other channel but i am a little surprise that the protection circuit did not is job and i dont like too much taking...

Sorry , i'm new not his site and i need help but i dont know how to start a new post. Anyway i need help with a Nad 200 Good day, One channel with 3 out of 4 output shorted, driver shorted, and one small transistor on output board equally shorted. Replace every thing and use light bulb and was...