jim...@earthlink.net said: > I guess the regen receiver must have had some gain at 1 MHz. I found an old > GE datasheet that gives the ft of 0.6 MHz. (and the hfe wasn't bad, 20, at > DC, probably)
> But you sure weren't building a 5MHz or 10 MHz oscillator with a 2N107 or a > CK722. Or the 2N170 NPN, which I am surprised to find you can still buy > (and cheaper, in constant dollars, than originally). Free to good home: RCA Transistor Manual, SC-10, 1962, $1.50, 300 pages 3/4 of it is Technical Data. Many 1/2 page. Some more than a page. Lots of germanium. Nothing on the 2N170 or CK722. GE Transistor Manual, 6th ed, 1962, $2, 440 pages Nothing resembling a data sheet. There are several tables with parameters. The Use column for the 2N170 says IF => Intermediate Frequency Amplifier. There is a chapter on Radio Receiver and Tuner Circuits and another on Basic Computer Circuits. -- These are my opinions. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.