Vintage CHALLENGER (BOGEN) Model CHA-33 Monophonic Audio Amplifier. Power output 33 Watts. Tube complement: (2) 5Y3 , (2) 6L6GC , (2) 12AX7 , and (1) 6AV6. Inputs: (2) Mic and (1) Phono. Volume controls for each. Separate Bass and Treble controls. Outputs: 4 , 8 , 16 Ohms and 75/150 Volts. Amplifier has just been overhauled including: (2) new 5Y3 rectifier tubes , new upgraded coupling capacitors , new input electrolytic capacitors and some other small components. Nothing overheating or drawing excessive current. All tubes tested and are good. Newer style black Bogen Challenger knobs installed. Controls cleaned and are quiet when operated. Enclosure bead blasted and repainted in a hammertone green enamel. Very attractive! Amplifier is working well with plenty of power and no filter hum. Crisp treble and strong bass response. Buyer to pay shipping. Shipping weight is 24 pounds packed well. Shipping via USPS or FedEx Ground only. Thank you for looking!!