Originally Posted by robert casey

Many years ago my father (now a silent key) built a crystal tester that
pretty much worked with any crystal you stuck into it. Low frequency,
high frequency, name it. It also had a meter that indicated "crystal
activity" and also had an adjustment (think it was a pot) for IIRC
"bias". Also an output jack to feed say a frequency counter.

I imagine that he got the circuit from either an issue of QST or the
handbook. Searched the web, though I found many circuits, none looked
like this one. Anyone recognize from my sketchy description the circuit
my father used, and any links to where I can get a schematic so I can
build my own? TIA

73s Bob