This began as a Newcomb B-100 sometime in the 1950s. Now it is an all-tube 5 watt amp.
It has volume, tone, and reverb controls.
The circuit is pretty similar to a Swart.
It can be used as a preamp, as a stand alone combo, or as a head plugged into a 4 or 8 ohm cabinet.
The 6" speaker sounds wonderful. A 10" or 12" sounds even better with this amp.