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Sunn Coliseum Bass (amp)

Recently acquired a Sunn Coliseum Bass (amp); silverfaced (pre `75). I knew another player with a later blackfaced model that just roars! Anybody have a manual/schematic for the pre `75 models? On-line schematics (Sunn Shack and elsewhere) seem to be the post-75 model, but they may both be the same design internally, since the amps seem to have identical controls.

The Concert Bass amps (pre/post `75) have somewhat different schematics, but the amps have different features as well. The silverfaced amps have a distortion & boost feature not found on the blackfaced models.
 
Hi all,
Like Robbie above, and 9 years later, I also just acquired a Sunn Coliseum Bass (also silverfaced), and I can't find schematics for it. Oddly, the back of the amp does not have the speaker output impedance or wattage listed. Anyone have a manual or know of a site where I can find one? Thanks in advance.