If you need a circuit that converts a momentary push button to a latching switch with low standby current, this design might ...

Through his dilly-dallying with digital logic, [Jeffrey] decided he would ... [Jeff] has a great tutorial for building a D flip-flop with Migen, but we’d love to see some more complex examples ...

The logic is actually done by crystal rectifiers, but the tubes do inversion. To make an and/or/invert gate requires a single triode or half of a 6J6A. A D flip flop requires three tubes or two ...