Tri-tet oscillator

It is a type of electron-coupled oscillator (ECO), which uses a tetrode or pentode tube.

The tri-tet was introduced by James J. Lamb in the June 1933 issue of QST magazine.

[1] In an ECO, the screen grid acts as a plate for the triode oscillator.

Some of the electrons pass through the screen grid to the plate, causing a current to flow in the load.

Jean Shepherd occasionally mentioned the tri-tet oscillator in his writing and radio shows.