As I remember ( and its over 60 years ago ) my transmitter used a 3S4. That was an audio bottle from battery sets back in the day.
http://www.r-type.org/exhib/abh0277.htm
I cannot remember anything else, EXCEPT that the receiver ( as I call it ) looked very similar to what the OP has shown in post #1.
I do remember it was power hungry and my six bob a fortnight was hard pressed to buy diesel fuel
( ether and castor oil ) and batteries. NOT to mention more balsa to make matches from when my piloting skills didnt match my ego!!.
THAT was a long time ago!!.
Joe
P.S. my piloting skills havent changed, except now I need buy more carbon fibre.