Hi-Mu High Gain Prototype amplifier

Here's a Hi-Mu prototype low watt, high gain amplifier I recently acquired on eBay.
The amp came without tubes or speaker or even a cabinet, and with the warning that it didn't work! I'm hoping to bring it back to life.

Clearly it can be seen by the pictures above and below that this amp was a work in progress. Barry Breisch, the designer, used an existing chassis and pop riveted patches over the amp's cutouts to create an amp architecture that was suitable for his needs.

Here's what she looks like from the control panel.

From this picture you can see that Hi-Mu used a black print on white design for the earliest versions of the amp. Most Hi-Mu amps in circulation are white lettering on a black background.

Here's a picture of late generation production version of this same amp, in a cabinet, using white lettering on a black chassis.

For those interested in her innards, here's Barry's hand-drawn schematic for this prototype, it's basically your standard English-style, mid-1960s EL-84 design.



For comparison, here's a standard Mullard EL-84 design of the era.