What Would It Take to Build a Tube PLL Circuit?
Wanting to follow in Neil's footsteps, I have a dream of building a medium wave transmitter using 100% tube technology. Step 1 is to design a stable oscillator.
As I understand it, basic MW frequency crystals have become difficult to obtain, so another method must be utilized to obtain frequency stability... such as Phase Locked Loop (PLL).
PLL circuits are common in solid-state form, but can they be built with tubes?