Xtal calibrator, 1980 ARRL Handbook
In the process of looking for the neon bulb divider, I found a few circuits
using a ECC81, or a 12AU7 or a 6U8 divider - and one circuit even using a
simple rc oscillator locked by the 100 kHz crystal to yield 50 kHz signals.
That was in QST.
73, Colin K7FM
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