This model of Yellow Jackets® converter, the YJC, 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 most audio amplifiers with 6L6s, EL34s, 6550s or 6V6s to EL84s without modification or rebiasing. Converts: Class AB Pentode to Class A Triode. Drops Output Power: 70% to 90%. Safe for all common amplifiers and transformers. Connects to chassis-ground for cathode-biased amps. 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 YJ7591, is a specialized, current-limiting/voltage-conditioning adapter for use in most amplifiers which use 7591 output tubes. All Yellow Jackets® converters come with JJ Brand EL84/6BQ5 vacuum tubes. Converts most audio amplifiers with 7591s to EL84s without modification or rebiasing. Converts: Class AB to Class A operation Drops Output Power: Slightly. 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 model of Yellow Jackets® converter, the YJ20, is a specialized, current-limiting/voltage-conditioning 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 most audio amplifiers with 6V6s and similar-based tubes to EL84s without modification or rebiasing. Converts: Class AB to Class A operation Drops Output Power: Does not drop power. 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...

Grounding lug. Package of five.