I noticed it was a rectifier when I looked at it on a bigger screen. I think you're right. That cylinder threw me off. I thought it might be some sort of regenerative radio.
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How about one of those really dangerous shock machines
Very godo value for these:
http://www.ebay.co.uk/itm/pair-jbl-s...oAAOSwCU1YrW0x
5mm Inspire Acri-mat...sitting at £14.00 no bids 1 day 6 hours to go...nice item...
http://www.ebay.co.uk/itm/Inspire-Ac...cAAOSw4A5YptFL
Funny old description - “It works but I feel that the bottom end a bit lacking”
http://www.ebay.co.uk/itm/Crimson-El...3D162394989287