Baird Emerson Wondergram
First produced in London by Baird in 1960, this is probably the first portable record player to have a similar form factor to the PS-F5. Definitely a direct ancestor.
The design is truly ingenious, open the lid, pop your disc onto the spindle and gently place the needle on the end of the tone arm into the groove and it starts playing. The record is spun by a pair of wheels set into the top of the case, they are spaced so that the innermost one drives 45s, and the out one drives LPs. To stop both wheels trying to drive the disc at the same time the inner one is slightly smaller, so that when you are playing an LP it doesn’t come into contact with the record. The speaker is on the underside, and you would think that the sound will be muffled, but they have that one covered. Three spring–loaded feet raise the player off he ground, allowing the three-transistor amplifier full reign to blast your socks off. Actually it’s not that loud but it’s enough to fill a small room – providing there’s not too much background noise…
From Dusty Gizmos.
Lots of photos and info on Electric Gramophone, including a complete strip-down.