Ekco 267/I restoration

[bandersen]

This website has a good article on the "spot wobble" circuit.
It is a stand-alone oscillator that drives a pair of coils positioned around the CRT neck so as to add a little vertical deflection to the electron beam. A frequency of around 12.5 MHz is used to avoid interference with reception and IF circuits.

http://www.thevalvepage.com/teletech/wobble/wobble.htm