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Old Tektronix or new Hantek

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2N3055:

--- Quote from: Performa01 on December 05, 2024, 07:56:36 pm ---
--- Quote from: mawyatt on December 05, 2024, 03:12:02 pm ---
--- Quote from: tggzzz on December 05, 2024, 12:02:47 pm ---
* I have a 200ps/1.7GHz 1970 scope that uses BC107 (fT=350GHz) transistors in the signal path
--- End quote ---

That's a pretty fast transistor, even today ;)

--- End quote ---

Yes, I was quite shocked too. Having still worked with the TO18 BC107/1087/109 in the seventies of last century, I've always thought they had 200 MHz transition frequency, and that only at relatively high collector currents between 15 and 25 mA. Had I known about the secret 350 GHz of these transistors, I would still have been baffled how a relatively big  leaded component can be that fast...

--- End quote ---

BC107/108/109 and plastic TO-82 counterparts BC182/3/4..

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