1950’s Knight model S-55! Dual 6L6 with a 5v4 rectifier! Awesome guitar head in a compact offering! These knight guitar amp conversions always leave me very impressed. Amplifier has been fully serviced, starting with a complete recap, any out of spec resistors replaced, grounded power and fuse added, impedance selector switch installed, capable of 4, 8 and 16 ohms, 1/4 input jack and speaker out installed and lastly a deep internal cleaning of all pots and tube sockets! Awesome tones from this guy, smooth cleans and some warm full bodied break up when she’s pushed!