Slightly off topic: the oscillator transistor has some 1854-XXXX part number, but is actually a 2N5179 selected for some minimum fT at 30 mADC collector current. When the oscillator starts up, before the ALC takes effect, a fairly large DC current can flow and some 2N5179's don't have enough gain to start oscillating. The startup current isn't very well controlled. This info from one of the 10811 designers.
I have a few 100 pF 10% glass varactors in my junk box if you can't get them anywhere else. The spec is the same 2X capacitance from 4 to 25 V, but a different XXXX-XXXX number because of the 10%. They are probably at least 30 years old! Rick Karlquist N6RK _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
