There's a lot of information available on the net about this amp so I won't go into great detail here. It does have a unque tremolo design and sound using a 6SQ7 based circuit and features 5879 pentode preamp tubes instead of the usual triodes seen in most tube preamp designs. See user manual pdf file below for the full schematic. The tone control uses a single knob that swings from "treble" to "bass". The tone control circuit is located between the phase inverter and power amp tubes as opposed to being part of the preamp section. It doesn't have a wide range but is still very useful. Plugging a guitar into the higher gain MICROPHONE input allows for a cool level of distortion on lead guitar if you strike the strings pretty hard. The amp is rated at 15 watts RMS and still has the original Jensen speaker (see pics below). Gibson suggests (in the original user manual, see pdf below) that service be performed by a "reliable radio man"! Like many early amp offerings this amp was often paired with the purchase of a guitar, in this case, a Les Paul solid body guitar. A nice review of this amp is located here on the Gibson official web site.

The song below was recorded in my home studio with the pedal steel and guitar parts using a Hall Of Fame reverb pedal. All tracks used a Shure SM-57 mic placed directly in front of the amp and fed into a Zoom R64 workstation. All tracks were then ported to a PC and mastered using Reaper.