This is about the earliest guitar amp ever produced.  Originally intended for lap steels these amps paved the way for the earliest of archtop electric guitars.  The tubes left to right are the black can 6N7, a 6C56, 6V6G, and a 5Y3GT rectifier

A word about purchasing any of these rare Vintage amps, “these amps need to be regularly cared for”.   These are very old and may need to be or may have been serviced in the past. We recommend that any of these amps upon purchase be serviced and then regularly looked over by a skilled amp tech. Used amps are sold here on a strictly as is basis. Thanks!