Hi Dave and Bob,
Thank you very much for your answers.
Yeah Dave, Ido not know what has exactly tek 502, I do not know if it is the glow of its tubes, its vintage appearance... but is has some kind of magic (like Freddy Mercury, sorry for the joke I could not resist).
Always is the pòsibility of buying anothger one for parts but, what about rewinding it?
Has anyone done that? is it posible?