The Paramount Pictures (ParaPix) Sub Amp, was a very popular surplus amp, sold by ApexJr.com. The units consist of a pair of LM3886 output modules, that can be configured for 2 x 50W into 8 ohms, or bridged for about 130W into 8 ohms. I have owned three of these units. They are great experimenter amps. Unfortunatly, they are long sold out. :(
Here you see a pair of them, fitted to a pine box, with hardwood ends. Each amp has been configured to bridge mode, with a 48VCT 6 amp transformer. Other mods include a switchable bass-boost, and a fixed 24db low-pass filter at 100Hz.
This amp is desined to power 8 ohm DVC sub drivers like the Shiva and Dayton DVCs. The theoretical output of bridged LM3886s is 200W. It is limited to about 130W by thermo shutdown. If I come across some large fin surplus heatsinks of the correct size, we'll see if a few more watts can be coaxed out.