Thank you, Chris, for your kind gift of a Siemens?AF118 transistor for testing.
At least in the Q373?position*, your sample AF118 performed like a 2N2207.? I saw 60ns delay and 25ns rise vs 50ns/35ns for 2N2207, giving the same turn-on time.
That said, my recommendation stands: BC556 or KSA992, with 220pF added to the speedup cap.? That's cheap and abundant and anyone can do it, not just the oddball with a box of AF118's. ?:)
Thanks,
David
* Should be the same in the Q173 position but I didn't test it.
________________________________________
From: TekScopes@... on behalf of Christopher Hilton-Johnson chj@... [TekScopes] <TekScopes@...>
Sent: Saturday, November 25, 2017 2:15 AM
To: TekScopes@...
Subject: Re: [TekScopes] Re: Tek 547 A Sweep display during retrace
Have you looked at the AF118 as a replacement for the 2N2207?
I ask, because most of my pulls were AFs pretending to be 2Ns
Chris HJ?
