THD YJSD Yellow Jacket Standard Duet Adapter  

Item #: 
12747416320649484
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An adapter that permits the use of an EL84 power tube in place of a 6L6, EL34, or 6550 in grid-bias amps. There are no adjustments to make and no modifications necessary. You simply plug the Yellow Ja... Click To Read More About This Product

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Overview

An adapter that permits the use of an EL84 power tube in place of a 6L6, EL34, or 6550 in grid-bias amps. There are no adjustments to make and no modifications necessary. You simply plug the Yellow Jacket® into the amp's output tube sockets, plug the provided EL84s into the Yellow Jacket®, turn on the amp, and play.

Yellow Jacket® converters not only rearrange the pin locations of the tubes, but also provide the necessary current limiting on the screens and cathode as well as blocking the amplifier's grid-bias voltage, configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.

When the Yellow Jacket® Converters are installed in larger amplifiers intended for 6L6s or EL34 output tubes, the high plate and screen voltages are reduced as well as current limited to protect the EL84 and to drop output power. When a pair of Yellow Jacket® are used in a Marshall 50W or similar amplifier, the overall power drops to about 20W and takes on more of the character of an old Vox AC30. The distortion is smoother and more even and the output is both substantially reduced and more compressed due to the Class-A nature of the Yellow Jackets®. In a 100W amp like a Twin Reverb or Marshall 100, either 2 or 4 Yellow Jackets can be used. If only two are used and the other 2 sockets are left empty, the output is dropped to about 20 watts. With 4 in place, the amp puts out about 40W and takes on a whole new warmth and richness.

Will they hurt your amp? No! Yellow Jacket® converters are safe for all amplifiers and transformers. As all Yellow Jacket® converters internally limit voltage and current they put no extra strain on amplifiers' power and output transformers or internal components. Using the Yellow Jacket® in higher powered amplifiers actually reduces the strain on the transformers and internal components because it reduces the overall wattage of the system. Furthermore, the heater (or filament) current of the EL84 is lower than that of the 6L6, EL34 or 7591, so the Yellow Jacket® will reduce the strain on the filament windings of the power transformer as well.

Features
  • Use an EL84 in place of a 6L6, EL34, or 6550 in grid-bias amps
  • Customer Reviews
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Review Snapshot

by PowerReviews
THDYJSD Yellow Jacket Standard Duet Adapter
 
3.3

(based on 3 reviews)

Ratings Distribution

  • 5 Stars

     

    (1)

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Reviewed by 3 customers

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(0 of 1 customers found this review helpful)

 
5.0

Sweet!

By Steverz

from Rock, Ca

Comments about THD YJSD Yellow Jacket Standard Duet Adapter:

These work great. I think the guy who gave it a one did'nt get the right ones. I'm pretty sure a peavey VK 112 has a cathode (fixed) bias and these thd's are for the grid based bias. So make sure you know what your doing and what type of bias you have to figure out which type of yellowjackets you need. These are definitley a perfect solution!

(1 of 2 customers found this review helpful)

 
1.0

Didn't work for me

By Scott K.

from Akron, Ohio

Comments about THD YJSD Yellow Jacket Standard Duet Adapter:

I own a Peavey Valve King 112 and thought I would try these. They are supposed to cut the volume of the amp and change the sound somewhat for the better, well in this case the opposite happened, the amp actually got a little louder and lost most of its bottom end. Maybe its my particular application, or one of the tubes is defective? Don't know. When I called guitar center they will not refund my money since these are tubes, very fustrating. So I'll try to contact THD or sell them on Ebay. They do install very easily as advertised, but my advice to you is unless you can try them in your amp before your buy, don't do it!

 
4.0

THD YJSD Yellow Jacket (Whats up with the tubes?)

By AP

from Alabama

Comments about THD YJSD Yellow Jacket Standard Duet Adapter:

Overall this is a decent product. It does what it is advertised to do. My only problem is this: The manufacturer of this product recommends JJ tubes, so that is what I expected to receive with it. However, mine arrived with a pair of Sovteks. Just wondering why they would recommend one tube and ship it with another.

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