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I am currently building Stewart1 detector and had difficulty getting the oscillator to run.Despite using 10m ohm for R6 nothing happened.I found some info on the net,one of which is fox crystals.There is a reference on forum about this site.I had to use 15m ohm for R6, 330k for R5, 10pF for C4 and C5.It may be wise to experiment on breadboard before assembly of PCB to check values for other watch crystals. Regards MAURICE