Well the first radio I ever owned was made by the next door neighbour when I would be about 12 - it was, I remember, single valve floor mounted thing with a 6 ft aerial and a bloody great big Ever Ready Battery and you had a push light switch which operated a continuous rotating servo - operating the rudder only and I am pretty certain the circuit diagram came from Radio Weekly magazine??? One thing I do remember about it was, whilst the neighbour built it, I watched him - the resisters had a dot on them rather than colour bandings.
I moved on from diesel powered home designed models onto hydro planes. So....no requirement for radio then.
The first one I purchased was in 1976 and I had to save up for it and that was a Futaba Attack Sport and its still working and I still have it.
aye
John