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NAD 218 THX amplifier Repair.

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SantaClaw:
I'm looking for bout 10 pairs of 2SC5200 + 2SA1943 transistors and I'm worried about getting fake trannies. I'm replacing some faulty ones in my Nad 218 THX amplifier..

I'm having problems locating a store that gives me confidence... lol

 

SantaClaw:
Right, I'm going to try this store: https://www.ebay.com/itm/263510261094

I mean they have over 10000 positive feedbacks so it can't be that bad?

goldfinger:

--- Quote from: SantaClaw on February 17, 2019, 10:48:26 am ---I'm looking for bout 10 pairs of 2SC5200 + 2SA1943 transistors and I'm worried about getting fake trannies. I'm replacing some faulty ones in my Nad 218 THX amplifier..

I'm having problems locating a store that gives me confidence... lol

--- End quote ---

I’ve got a lot of NOS jfet etc from bg-electronics-de an eBay seller from Germany can highly recommend...




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exe:
Just buy from any reputable distributor, there are plenty of them: tme, digikey, mouser, rs-online, farnell... Why bother with ebay? Most reviewers have no clue how to test if it's a genuine part or not.

BTW, there are different manufacturers of these transistors. I found 2sta1943 from ST to have better performance (read more gain and phase margin in common emitter mode) than Toshiba part in my stupid tests at current about 1A and Vce ~0.5V or so. Although I tested only one or two of them :)

SantaClaw:
I'm not an expert at all, I just know one channel is dead, and a protection resistor keeps blowing, so I figure replace them all..

I've sent a query to that German store, we'll see what they say..

I have no clue what to look for in a good transistor. I just want something that works... lol

I don't know if lets say: https://www.digikey.no/product-detail/en/2SC5200N(S1%2cE%2cS)/2SC5200N(S1ES)-ND/4815288/?itemSeq=284842507 and https://www.digikey.no/product-detail/en/2SA1943-O(Q)/2SA1943-OQ-ND/871383/?itemSeq=284842527 will work together...

The price is virtually identical to that Ebay store, I also seem to get free shipping from Digikey, I f I can use those parts I can give it a try...  I have no way of matching the transistors that I am aware of, I have an osiliscope multimeter thingymybob (Uni-T ut81c), and a basic component tester but that's about it.

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