Vladislav Damyanov shares his vacuum tube oscillator project:
The above you see is a result of my work in which i tried to go Vintage with my design. I was talking about the usage of Vacuum tubes when i mention the word Vintage, am pretty sure you will agree to it as well. This vacuum tube oscillator can be used for testing purposes and uses diodes as an amplitude stabilization and automatic gain control.
More details at Gadgetronicx homepage.