Mystery Guitar Amp

I was given this little amp a long time ago. It has no markings or brand identification of any kind, but a little sleuthing revealed that it was manufactured by Valco, probably in late 1963 or early 1964 . Apart from changing the fuseholder and reforming the filter caps, this amp didn't need anything major done to it.

A front view of the amp.

Online sources date the serial numbers G100–G5000 to 1962, but this amp seems to have been built later than that.

The serial number tag, which is steel and mounted to the amp with two small nails. The tag reads "G4568."

Everything about this amp looks like a Supro Super, but the examples I've seen online have different handles, have logos on the front, and have names over the input jacks.A view of the top of the amp. The plating is in rough shape, but the handle and cloth covering are fine. The input jacks.

This pot was made during the 25th week of 1963 by Chicago Telephone Supply (137).A closeup of the volume pot. The EIC code reads "1276325."

The EIA code on the speaker indicates that was manufactured by Jensen (220) during the 51st week of 1963.The speaker with the codes "550-01" and "220351" stamped on the magnet housing.

The output transformer was manufactured by Triwec Transformer (524) on the 45th week of 1963.The output transformer, which is stamped "E 2640" and "5236345."

The power transformer was also made by Triwec, during the 44th week of 1963.

The power transformer, which is stamped "E 2026" and "5246344."

The circuit is simple: one 5Y3 rectifier tube, one12AX7 tube for preamp, and one 6V6G for output. Overall power is 5 about watts. A view of the back of the amp. Schematic of a Valco 6150 amplifier.

The amp chassis.

The venerable 6V6 power tube. An RCA 6V6 power output tube.