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Tube Converter - Yellow Jackets®, YJUni
Product Data:
Item ID: 001882
In stock
Type → Adapters
Yellow Jackets
Tube Converter - Yellow Jackets®, YJUni image 1

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. If your amp is cathode-biased, then no bias adjustment is needed. If your amp is fixed biased, then the bias should be adjusted just as it would be according to the standard biasing instructions included with the amp. All Yellow Jackets® converters come with JJ Brand EL84/6BQ5 vacuum tubes.

  • 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.
  • 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!

There is no rebiasing involved, which makes modifying your amp's tone very easy. Yellow Jackets® converters give you simple Class-A operation from any amp. They not only rearrange the pin locations of the tubes, but also provide the necessary plate voltage drop and current limiting on the screens as well as blocking the amplifier's grid bias voltage while configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit. In other words, there are no adjustments to make and no modifications necessary, you simply plug the Yellow Jackets® into the amp's output tube sockets, (in cathode-bias amplifiers) screw the ground wires under one of the output tube socket mounting screws, plug the provided EL84s into the Yellow Jackets® converters, turn on the amp and play.

All Yellow Jackets® have a two year warranty against manufactured defects.

For more information, see Yellow Jackets TC

DuetP-YJUNI-DPackaging Dimensions2.125 in. x 2.125 in. x 3.5 in.
DuetP-YJUNI-DWeight0.308 lbs.
All modelsItem Height1.68 in.
QuadP-YJUNI-QPackaging Dimensions3.5 in. x 2.25 in. x 2.25 in.
QuadP-YJUNI-QWeight0.616 lbs.
SingleP-YJUNIPackaging Dimensions3.4 in. x 2.4 in. x 2.4 in.
SingleP-YJUNIWeight0.208 lbs.

Specifications, Files, and Documents: