Vision FM Teletuner

[Jonathan]

I purchased a Vision FM Teletuner. It is similar to a UHF converter is design, but receives FM on the FM band and pipes the sound through channel 2 or 3. When the unit is switched off, it passes the antenna signal.

Inside it cosists of a hot chassis with stinky selenium rectifier, a variable condensor (not like Zenith's FM tuning methods at all, so this must drift like crazy, the plates have wide gaps between them), a 6BA6, a 6C4, two large isolation transformers for the antenna input and output(looks more like audio transformers, I have no idea how RF passes through them so easily, if at all), an electrolytic multicap, and a plethora of inductors and capacitors. It looks cheaply made and looks like it'll barely perform well at all. It did have a 90 day warrenty, so it must be crap.

But, I love a challenge. Would anyone know if any sevice data existed and where one would find it? I'd love to play around with this one.

Thanks.

Jonathan