This amp is powerful for a 50 watt. Model JG3, serial # 2051, it has a sticker inside with a date 1989. The gain 2 knob gives it masses of drive, there is a 3 position mid boost knob, & the mid knob itself has a pull boost function.
There is a voltage changer for 120v, 220v & 240v. Also an ohm selector for 4, 8, & 16 output.
The valves are 5 x 12AX7, 2 x EL34.
(Note – this item is SOLD)