This is a 3-tube amplifier using 5Y3 rectifier, 6SJ7 preamp, and 6V6 output. I replaced the old filter capacitors with 600 volt electrolytics. This is a 70 year amplifier, and it shows its physical age, but the electronics are in excelent working condition.

Brand: Gibson
Exact Year: 1954
Model: Les Paul Jr GA-5
Country/Region of Manufacture: United States