Re: Tek 547 A Sweep display during retrace


Dave Wise
 

BC556 + 220pF is 55ns/30ns, the same on-time as the 2N2207. The Pro-Electron C-B-E pinout makes it easier to use than KSA992.

Two more base-in-the-middle parts:
MPSA56 + 470pF is 55/30.
PN2907A + 470pF is 60/30.

And there's a laugh - the PN2907A was what I tried something like ten years ago and gave up!

Join TekScopes@groups.io to automatically receive all group messages.