I wasn't hoping for much but one is ever so curious. Could be a variation of the same circuit King Sound uses in the M-10 and the sockets might be the King Sound units as well. It's hard to tell with any certainty but it appears to have the same textured finish.
Looks like a version of this design:
http://www.ebay.com/itm/2609-Full-aluminum-chassis-Preamp-box-Power-amp-Enclosure-Case-DIY-/400526703642?pt=UK_Sound_Vision_Amplifier_Parts&hash=item5d41407c1a
There is also the 2607 so this could be the 2608...