The metal cased Teleton is the VX1110 CTV, I have one in my collection and yes it does have weird valves having 400mA heaters, not too much heat then
It was made in 1973 and still uses a 3AT2 EHT rectifier.
It was working great when I put it to bed some 8 months ago, got it out the other night, "click" and...............nothing!
Cheers
Lee