[time-nuts] Ancient OCXO in scope calibrator.

[John Miles]

> >Still don't understand why probing with a 10Meg, 1pF load kills the
> >oscillation stone dead until the next power cycle.
>
> That says that the circuit had just enough gain and positive feed back to
> oscillate but just barely.  I'd have to see the circuit to
> recommend changes.
> The root cause is probably lost gain in the tube but that can be
> compensated
> for.


How's the filament voltage at the 7587 socket, by the way?  A shorted turn
in your power transformer might account for some lack of enthusiasm on the
Nuvistor's part.

-- john, KE5FX