This circuit is from 1969.R1 and R2 are 4.7 M and R3 is 1.2 M. C1 C2 is 22 nF and battery B1 is 300 V. B2 is 1.25 V. The tube is not easy to get these days.
This circuit is from 1969.R1 and R2 are 4.7 M and R3 is 1.2 M. C1 C2 is 22 nF and battery B1 is 300 V. B2 is 1.25 V. The tube is not easy to get these days.
