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Old 6th Dec 2017, 12:24 pm   #3
MrBungle
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Join Date: Jun 2016
Location: London, UK.
Posts: 2,474
Default Re: Matched Transistors

Indeed.

I think the only time I've seen this being a problem is in discrete differential amplifiers, typically where I am being too cheap to buy a CA3028 for a circuit. Keeping them at the same temperature helps there, enough to be useable. I pick two (2n3904's) with an hFe within 20 or so and then thermally bonded them together with heatsink compound and stick some heatshrink over the pair. Worked very well.
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