This model of Yellow Jackets® converter, the YJShort, is a specialized, current-limiting/voltage-conditioning adapter for use in most amplifiers which use 6L6, EL34, 6550 or 6V6 output tubes. This Yellow Jackets® converter is shorter than the standard Yellow Jackets® converter, allowing for use in amplifiers which do not have room for the original Yellow Jackets® converters. All Yellow Jackets® converters come with JJ Brand EL84/6BQ5 vacuum tubes. Converts most audio amplifiers with 6L6s, EL34s, 6550s or 6V6s to EL84s without modification or rebiasing. Converts: Class AB to Class A operation. Drops Output Power: 50% to 70%. Safe for all common amplifiers and transformers. Short enough to fit in most Blackface Fender® heads. 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. Yellow Jackets® converters allow you to harness the musicality of EL84 vacuum tubes in amps that don't use them already - it's like getting a whole new amplifier! In place of a 6V6 a Yellow Jackets® converter will even out the tone and make it sound stronger. 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 your amp's tone very easy. More...

This model of Yellow Jackets® converter, the YJS, is a specialized, current-limiting/voltage-conditioning adapter for use in most 20 watt to 100 watt amplifiers which use 6L6, EL34, 6550 or 6V6 output tubes. All Yellow Jackets® converters come with JJ Brand EL84/6BQ5 vacuum tubes. Converts: Class AB Pentode to Class A Triode. Drops Output Power: 70% to 90%. Converts most audio amplifiers with 6L6s, EL34s, 6550s or 6V6s to EL84s without modification or rebiasing. Safe for all common amplifiers and transformers. 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. Yellow Jackets® converters allow you to harness the musicality of EL84 vacuum tubes in amps that don't use them already - it's like getting a whole new amplifier! In place of a 6V6 a Yellow Jackets® converter will even out the tone and make it sound stronger. 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 your amp's tone very easy. More...

This Yellow Jacket converter is a specialized adapter which permits the use of EL84/6BQ5 power tubes in place of 6L6 or EL34 type tubes. Yellow Jacket converters not only re-arrange the pin locations of the tubes but also provide the necessary current limiting on the screens and cathode. Yellow Jackets block the amplifier's grid bias voltage, which configures the EL84/6BQ5 into a class A self adjusting bias circuit. Tubes are not included. Manufacturer recommends the JJ EL84/6BQ5.

This model of Yellow Jackets® converter, the YJUni, is a simple pin-converting adapter for use in most amplifiers which use 6V6 output tubes or other similar based tubes such as the 6F6, 6G6, 6K6, 6Y6, etc. All Yellow Jackets® converters come with JJ Brand EL84/6BQ5 vacuum tubes. Converts pin configuration from 9-pin to 8-pin to allow certain 6V6, 6K6 and similar low-voltage circuits to use EL84 tubes. Does not drop power. Safe for all common amplifiers and transformers. Great for adapting tube-testers to test EL84 tubes. Perfect for THD UniValve, BiValve-30 and Flexi-50 amplifiers. 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. Yellow Jackets® converters allow you to harness the musicality of EL84 vacuum tubes in amps that don't use them already - it's like getting a whole new amplifier! In place of a 6V6 a Yellow Jackets® converter will even out the tone and make it sound stronger. 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 your amp's tone very easy. More...