Color ClassificationA: 1 pair of original tubeB: 1 pair of same level precision matchingToshiba original 2SC5200 2SA1943 pair of tubes, everyone who has played HIFI knows, no need to introduce more230V 15A 150WOriginal imported, not domestic counterfeit, rest assured to buy, real picturesThe appearance of the fake tube is also very similar. The best way to test is to increase the IC to 1A. The magnification of the real tube basically fluctuates very little, and the magnification of the fake tube drops a lot.Below is the internal diagram, the chip is quite largeIt can be shipped with matching, matching magnification and VBE