This is your typical tube PA head that was very common in the 60's.  This one uses (4) 12AX7 and (2) 6L6 tubes.  It has 4 channels, each with it's own Volume control, along with a master Volume, Treble, and Bass controls.  It also features reverb controllable with a single knob for the entire unit.  No labels indicating Bartell manufacture but it certainly looks like one.

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