Tube Converter - Yellow Jackets®, YJS

Yellow Jackets
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Tube Converter - Yellow Jackets®, YJS

Starting at: $44.95
In stock

The YJS is a specialized, current-limiting/voltage-conditioning adapter for use in most 20 to 100 watt amps that use 6L6, EL34, 6550 or 6V6 output tubes. The YJS is for amps with fixed bias power tubes. (Fixed bias tubes have their cathode connected directly to ground and a negative DC voltage applied to their control grid). 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 most audio amplifiers with 6L6s, EL34s, 6550s, or 6V6s and similar-based tubes to EL84s without modification or rebiasing.
  • Converts: Class AB to Class A operation
  • Drops Output Power: 50% to 70%.
  • 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 one year warranty against manufactured defects.

For more information, see Yellow Jackets TC

RoHS Compliant
SKU:
P-YJS-X
Item ID:
001878
Brand:
Yellow Jackets
Part Numbers
Quantity TypeOur Part NumberUPC/EAN
DuetP-YJS-D889406037199
QuadP-YJS-Q889406037236
SingleP-YJS609722126335
Product Measurements
Item Diameter1.301 in.
Item Height, without pins2.18 in.
Item Height, with tube5.0 in.
Packaging Information
Packaging DimensionsDuet version3.4 in. × 2.4 in. × 2.4 in.
Quad version4.75 in. × 3.75 in. × 2.531 in.
Single version3.4 in. × 2.4 in. × 2.4 in.
Weight (Packaging)Duet version0.347 lbs.
Quad version0.541 lbs.
Single version0.225 lbs.

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Questions and Answers

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Asked by Anonymous on August 27th, 2015.
Anonymous
August 27th, 2015
Top Contributor
A Fender Twin uses 6L6 tubes, giving it a very classic "American" sound. Converting your amp to EL84's using the Yellow Jackets converters will definitely get you closer to the "British" sound as AC30's utilized an EL84 power section.
Asked by Anonymous on January 2nd, 2016.
Anonymous
January 7th, 2016
Top Contributor
The YJS is compatible with 6550 tubes so you should be good to go but we always suggest measuring your space in the head to see if they converter and tube will fit. We are always more than happy to compare your measurements to the height of the Yellow Jacket.
Asked by Anonymous on March 7th, 2016.
Anonymous
March 8th, 2016
Top Contributor
You would first need to determine the type of bias adjustment your amp has to know whether the YJC or YJS is suitable. One of the two will work. For more info visit https://www.yellowjacketstc.com/faqs . or email info@yellowjacketstc.com.
Asked by Anonymous on May 25th, 2016.
Anonymous
May 25th, 2016
Top Contributor
Your amp is a " fixed bias" with an adjustable bias pot. You should be able to take out the 6L6 tubes and install the Yellow Jackets with no issues or adjustment. When re installing the 6L6 tubes I would still suggest checking the bias but you can switch them at will.
Asked by Anonymous on October 14th, 2016.
Anonymous
October 14th, 2016
Yes, the YJS is listed as being compatible with 6550 power tubes so you should be good to go.
Asked by Anonymous on October 14th, 2016.
Anonymous
October 14th, 2016
This is a solid product produced in house for maximum reliability. The socket should have an extremely long life though the tubes will have to be replaced periodically.
Asked by Anonymous on October 21st, 2016.
Anonymous
October 21st, 2016
Please email the manufactures at info@yellowjacketstc.com. They will be able to help you find the right Yellow Jacket for your amp.

Product Reviews

5.00 out of 5 based on 2 reviews
- July 2nd, 2017
5 out of 5

Glad I made this purchase. Yellow Jackets with the provided EL84's are well worth the money spent. Big improvement in the useability of my tweed Fender Bassman amp.

- July 2nd, 2017
5 out of 5

Glad I made this purchase. Yellow Jackets with the provided EL84's are well worth the money spent. Big improvement in the useability of my tweed Fender Bassman amp.

- July 2nd, 2017
5 out of 5

Glad I made this purchase. Yellow Jackets with the provided EL84's are well worth the money spent. Big improvement in the useability of my tweed Fender Bassman amp.

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