Unique PP 6BQ6B Tube Basic Amplifier Fresh Vintage Tubes Triode Sound Not certain of the original designer or builder of this PP 6BQ6B Tube amplifier. 6BQ6B is is an beam-power Pentode designed for application in tube televisions. Amplifier was built on a painted aluminum chassis and has a perforated metal bottom with rubber feet. Front end tubes are vintage 6AB4 and 6CG7/6FQ7- test new on Ampitrex AT1000 tub tested. Output transformers are matching vintage Scott TPA-11-2. 6BQ6B plate caps are from NOS vintage television source. Power supply capacitors are used with full wave bridges. Circuit coupling capacitors are all brown vintage Cornell Dubilier capacitors as found in vintage 60s hi-fi tube amplifiers. Many NOS 1% metal film resistors both vintage military surplus and modern. Circuit has vintage NOS Ohmite Type AB variable potentiometers for setting cathode bias on the individual 6BQ6B output tubes. Construction indicates builder has built has designed and made many tubes amplifiers. Builder may have been professional trained in industrial capacity.. All solder joints are bright. Amplifier is in in working condition with no hum. Power supply is silent. Sound is excellent with excellent base reproduction. IMPORTANT – Be sure to read the Terms and Conditions of Sale Hardware Packing – Domestic and Outside US: Item will be wrapped with bubble wrap in two directions and double boxed. Use of a friend’s account or biding for a friend is not allowed. Vacuum Tube Sales: Please have a vacuum tube trained technical set up your amp with these tubes in order to prevent miss-installation with resulting “Red Plate”.