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Yellow Jackets

Yellow Jackets® allow EL84 power tubes to be used in place of most common guitar amp power tubes, providing a "self-bias" Class-A configuration for the EL84 so that no bias adjustment is required.

EL84s have a tight and focused sound, and most converters will produce a substantial maximum power reduction making it easier to find that sweet, warm mix of preamp and power amp distortion at a lower volume.

For more information, see YellowJacketsTC.com

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P-YJUNI-TTube Converter - Yellow Jackets®, YJUni, Triode version
Multiple Options Available
The YJUni is a simple pin-converting adapter for use in most amps with 6V6 or similar based tubes like 6F6, 6G6, 6K6, 6Y6, etc. The YJUni is shorter than standard Yellow Jackets®. It is designed for use in lower power output amps (20 watts or less) when no power reduction is desired.
Starting at $50.00
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P-YJC-TTube Converter - Yellow Jackets®, YJC, Triode version
Multiple Options Available
The YJC is similar to the YJS, but for use in amps with cathode-biased power tubes. Cathode-biased power tubes have a bias resistor connected from their cathode to ground. The ground wire of the YJC is used to bypass the amp’s cathode bias components so the Yellow Jacket® converter’s internal bias components are used instead. All Yellow Jackets® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
Starting at $59.00
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P-YJ7591-TTube Converter - Yellow Jackets®, YJ7591, Triode version
Multiple Options Available
The YJ7591 is a specialized, current-limiting/voltage-conditioning adapter for use in most amplifiers that use 7591 output tubes. Only the triode version will provide a noticeable power reduction. The ground wire connects to chassis-ground for cathode-biased amplifiers. All Yellow Jackets® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
Starting at $59.00
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P-YJ20-TTube Converter - Yellow Jackets®, YJ20, Triode version
Multiple Options Available
The YJ20 is for use in most amplifiers using 6V6 output tubes. The YJ20 is similar to the YJC but does not drop the plate and screen voltages. It is meant for use in lower power output amps (20 watts or less) when no power reduction is desired. The ground wire connects to the chassis-ground for cathode-biased amplifiers. All Yellow Jackets® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
Starting at $59.00
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