YJNOS, Yellow Jackets&reg; Tube Converter The new Yellow Jackets NOS (New Old Stock) Tube Converter is a limited edition converter made for use in most amplifiers under 100 watts and using 6L6, EL34, 7027, or 6V6 output tubes The converter lowers the overall power in your amplifier and gives your amp a unique vintage tone. This NOS Yellow Jacket is designed with an NOS 6AQ5 seven-pin miniature beam power tube, which is included with the converter The 6AQ5 was used on many vintage practice guitar amps in the 1950s as well as many film projectors in the past This tube is popular with DIY amp builders who often convert old film projectors into guitar amps While electronically equivalent to the 6V6 with a slightly lower power rating, the 6AQ5 has its own unique vintage tone that sets it apart from its eight-pin big brother