Hi Douglas
thanks for that reply, it has helped me... I'm actually on the Isle of Anglesey, North Wales, so not exactly handy for either of those places, and I would agree that I need to find a specialist.
Though, as you say, actually I'm never going to use the amp any more, so just selling it 'as is' might be for the best.
I'm a very poor guitar player, and just mess about, its never been gigged or put under any stress, so it is in great condition for its age - my thoughts are that the longer I keep it, the more it'll be worth, but I dunno, maybe not.
I suspect I might get a really good price in the States, but the shipping would be a worry with all the delicate parts. Anyway, thanks for the advice.
Paul