[Radio Wrangler]

Electron-coupled amplifier stage (sometimes called 'transitron'). Notice that neither the anode nor the cathode are coupled into the tuned circuit. The tuned circuit is a pi-section which could be as per Vackar, depending on value ratios.

It's quite a neat circuit, getting a degree of isolation to the output more than a non-transitron circuit would give.

The amateur radio world gets a lot too fixated on applying names to oscillator circuits. It's better to look at them and visualise their operation. Also, ask yourself about the usual elephant in the room; what controls the amplitude?

David