[GeoffK]

This is a similar radio, it works well with surprisingly good audio for its size. It has two 1.5V cells instead of a 9V battery. Five silicon transistors, one silicon diode detector, one IF stage, driver and output transformer with 8 Ohm loudspeaker.

Jolly 7 radio seems very unusual having five transistors but no driver or output transformer. The positive lead appears to be connected to one side of the speaker, this is a bit strange as well.