10pcs(5pcs 2SA1943+5pcs 2SC5200) PNP NPN High Power Matched Audio Transistor Silicon Precision,3-Pin.

They work exactly like they're supposed to good quality sound.

They work out fine

Counterfeit [IMO]Failed miserably.I am now testing all incoming parts!Both NPN and PNP fell way short of specified voltage ratings.(transistors normally exceed voltage ratings by a wide margin).Both NPN and PNP suffered secondary breakdown at only a fraction of rated parameters!Both NPN and PNP have inferior heat tab material. (probably about 1/5 the heat transfer capacity of OEM).Here are my results:hfe; PNP 120-130, NPN 65-70 (both within <10%). [measured all]Secondary Breakdown failure: Both NPN and PNP shorted @ <2.5A @ <25V (<2 seconds). Failed at medium voltage and current not even close to the secondary breakdown limit area of the SOA chart! [tested one of each]Vceo: Both failed voltage tests; PNP @ 145V. NPN @ 184V. [tested one of each]I did not check them at 15A. No point in going any further if they are failing these tests.I took a chance because of conflicting reviews, allowing for novices that don't understand SOA limitations, and under time pressure.Very disappointed.I am repairing two professional sub-woofers that utilize ±95VDC unregulated supplies.Allowing for line voltage tolerance and possible remote generator operation, and a decent safety margin; they need to withstand 200V+ in operation plus a safety factor.They are marginally designed to begin with, and cannot tolerate replacements not meeting the minimum ratings of the originals.(These are the original part numbers, I was not substituting when I ordered these).Do not buy these,Regards,Mr KL

Seemed to be matched Vbe but almost 2x diff in hFE. Not exactly matched pairs.

An Amplifier

It's very fun replacing a very expensive transformer when the transistors blue destroying the speaker also

Bad quality! Amplifier on and burn at moment!! Technical support false!! all FAKE!! money wasted!

No sirven