Quote:
Originally Posted by duncanlowe
This won't help at all. But you have properly brought back a memory. When I was in my teens, we helped out by doing a charity collection for something at our local cinema. In return we were given a tour of the projection room and facilities.
Even though we are talking late seventies / early eighties, the projectors were all quite old, and used carbon arc. They had been installed when the town used DC. So when it changed to AC they installed one of these, and a bank of resistors in 'the resistor room'. Later the AC voltage changed, so a big transformer was added.
Seeing one of these, working, hidden in some kind of cupboard with it's eerie purple glow is a long lasting memory.
I just wish I'd taken a camera that day!
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I once replaced a failed mercury rectifier with some silicon diodes in a cinema. The manager could not believe that such a complicated device could be replaced by what to him looked like a few large nuts & bolts. Every time I met him in the bar after, he would introduce me as some sort of magician!