Yellow Jackets Tube Converters

Yellow Jackets
"The next best thing to getting yourself a new amp."
-Guitar World Magazine

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.