e_man_89 Member Nov 10, 2021 #1 What other transistors have been used to put this one together? The OC139 is kind of hard to come by.
What other transistors have been used to put this one together? The OC139 is kind of hard to come by.
B benny_profane Well-known member Nov 10, 2021 #2 Any NPN Ge transistor with moderate gain (hFE from 65 to 100 or so) and reasonable leakage (anything <300uA should be fine).
Any NPN Ge transistor with moderate gain (hFE from 65 to 100 or so) and reasonable leakage (anything <300uA should be fine).
