Electronics > Beginners
How to test transition frequency of a transistor
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AndreyS:
I've bought used guitar amp Yamaha G100B-212. And it contained two non-original parts: power transistors 2n6254.
I've bought original 2x Toshiba 2SC1080 from China. It was said, that they were refurbished. As the seller later explained there were pulled out from other electronic devices.
They looks original, but anyway I'd like to put them to the test.
Is there an easy way to test them? And how to test properly a transistor meant for audio purposes?
AndreyS:
My thoughts on this matter are that transition frequency and linearity are the main points. Is this correct?
magic:

--- Quote from: AndreyS on August 07, 2019, 02:08:30 pm ---from China
--- End quote ---
;D

Well, I would be more worried about SOA than all that "performance" nonsense, but to test it you would need to mount them on a good heatsink and get them hot.

I suppose it's not a bad idea to test beta linearity, fakes are likely to show poor performance and perhaps low overall beta to begin with.

As for fT, I suppose some signal generator and scope will be required. How high are you trying to measure?
SparkyFX:
..in the range it is meant to be operated in.
Both types do have some differences (pulled from the next best datasheets for these types)
2n62542SC1080Vceo85V100VhFE5-7040-140
There are expensive component testers out there ofc that do the job for you, building one requires some way to plot the results, either measure several points individually and plot them graphically one by one or by automated test equipment and scripting.

T3sl4co1l:
Audio amp isn't going to care.  Put it in and check if it oscillates on a full amplitude sine wave.

Tim
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