Yellow Jackets converters are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6, EL34, and 7591 type vacuum tubes, allowing to harness the musicality of EL84 vacuum tubes in amps that don't use them already. In larger amps that use two 6L6, 6550, 7027 or EL34 power tubes the Yellow Jackets converter will drop the output power to about 15 to 20 watts, giving it more of a vintage VOX AC30 sound. In amps that take four power tubes the Yellow Jackets converter will sweeten the tone and make it more dynamic. There is no rebiasing involved, which makes modifying any amp's tone very easy.
Yellow Jackets not only rearrange the pin locations of the tubes, but also provide the necessary plate voltage drop and current limiting on the screens as well as blocking the amplifier's grid bias voltage while configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit. In other words, there are no adjustments to make and no modifications necessary.
This new 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 in many vintage practice guitar amps in the 1950’s 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.
As with all Yellow Jackets, the 6AQ5 Yellow Jacket converter will operate in a Class-A self-adjusting cathode-bias circuit.
All Yellow Jackets Tube Converters are handmade in the USA. Yellow Jackets are well respected, known for their high quality and ability to change the tone of amplifiers without the need of a technician.
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