[Techman]

I thought I'd got one the same as yours up in the loft. I went up there a couple of hours ago and fetched it down, but it seems to be the earlier model with a mechanical speed change that moves a belt from one pulley size to another. I powered it up and the amplifier, motor and lamp all worked, but there was a distinct lack of anything else going on. I took the cover off and found that the movable belt was slipping due to the worm drive being cracked and solid, so that's the end of that one!