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