Check out this ridiculous thing i got cheap off ebay the other day
(http://www.circuitbenders.co.uk/IMAGES/pioneer/mainpioneer.jpg)
Its called an SR202 reverberation amplifier and is in fact a excellent sounding, if a little noisy, spring line reverb that was obviously meant for Hi-fi use. The spring line is in that octagonal metal box with PIONEER written on it.
Whats weird about this thing is all that string and gearing at the front which creates a ridiculously over the top and completely meaningless display when you turn the 'reverberation time' knob.
(http://www.circuitbenders.co.uk/IMAGES/pioneer/pioneercables.jpg)
(http://www.circuitbenders.co.uk/IMAGES/pioneer/pioneerscreen1.jpg)
(http://www.circuitbenders.co.uk/IMAGES/pioneer/pioneerscreen2.jpg)
All its doing there is going to an absurd amount of trouble to move two triangular bits of blue plastic horizontally across each other in order to indicate absolutely nothing. ::)
Looks cool though and i've got to admire the lengths that the designers went to just to get that effect ;D