Electronics > Beginners
Fake 2n3055's
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lordvader88:
I bought some cheap ones, assuming they shouldn't cost much anyway, and they are garbage. I lost  2 whose collector-emitter junc. fried under 1.5A in a homebrew PSU (that works good).

And just now fried the base-emitter with 300mA I(col) on there for about 5 minutes. I wasn't looking at it when it happened, I just looked over and the output was zero volts. Vce was 10-20V iirc.

I better test the PNP versions I bought too.

I bought them last year, I should have checked them right and claimed for buyer protection for fake parts.
Dabbot:
Pop them open and take some pics. Where did you get them?

https://www.eevblog.com/forum/repair/warning-fake-mj16012-transistors-on-ebay/
Yansi:
Problem is, even the genuine ones are absolutely useless these days!!! The so small barely visible silicon die coupled with the steel case with zero to no good thermal conductivity makes the transistor useful only as a paperweight and even that would not be good enough.

Ditch 2N3055,  use TIP3055 (TO247). That at least, when kept within reasonable limits, works wonders.
amyk:
You did heatsink them, right...?
strawberry:
good component metal tab should fry blue before going short/open or unsolder wires
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