Advance Q1

NOTES	A signal generator aimed at the servicing of television sets, released just in time for the beginning of Band III television signals. Period advertisment [171K] from the July 1954 edition of Practical Television magazine.
SERVICE DATA	Nope :-( I'm intriqued as to how they generated a square-wave modulated carrier with just a single double-triode valve.
CURRENT STATE	Pretty clean and working, the only minor fault being the tendancy for the tuning scale to stick in the middle for no obvious reason.
WHERE FOUND	July 2003 Haydock park event for a fiver.

The case is basically one large screened box. Even so, the
main circuitry is housed inside another metal box - inside
yet another metal box !!!