Solid State Rectifier - Yellow Jacket® YJR, For 5AR4, 5U4, 5Y3

Yellow Jacket
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Solid State Rectifier - Yellow Jacket® YJR, For 5AR4, 5U4, 5Y3

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The YJR is a direct plug-in replacement adapter for use in most amplifiers that use 5AR4/GZ34, 5U4, 5Y3 or similar full-wave rectifier tubes. The YJR converts your amp's vacuum tube rectifier to a solid state rectifier, reducing tube sag for a tighter sound and feel. The tube rectifier can easily be swapped back in when sag is desired. This Yellow Jacket® is a solid state device and as such does not require vacuum tubes.

  • Converts most audio amplifiers which use a vacuum tube rectifier 5AR4/GZ34, 5U4 or 5Y3 to a solid state device.
  • Safe for all common amplifiers and transformers.

All Yellow Jacket® converters have a one year warranty against manufacturer defects.

Item ID:
Yellow Jacket
Product Measurements by Type
Item Diameter1.301 in.
Item Height0.82 in.
Packaging Information
Packaging Dimensions4.75 in. × 3.5 in. × 1.315 in.
Weight (Packaging)0.0882 lbs.

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Specifications, Files, and Documents

PDF: YJR Instruction Sheet YJR Instruction Sheet3.27 MB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on August 27th, 2015.
August 27th, 2015
Staff Member
Top Contributor
Using a solid state rectifier will stiffen up your power supply a bit and reduce sag.
Asked by Anonymous on October 21st, 2016.
Matt H
October 21st, 2016
As long as you are replacing a 5AR4/GZ34, 5U4 or 5Y3 rectifier tube then this will work. It may have more pins that your tube but the extra pins are not connected to anything.
Asked by Anonymous on November 10th, 2017.
Matt H
November 10th, 2017
We do not have a replacement for the 5Y4G.
Asked by Anonymous on November 28th, 2017.
Matt H
November 28th, 2017
These are the same thing but made but two different manufacturers.
Asked by Anonymous on January 10th, 2018.
January 10th, 2018
Staff Member
Unfortunately, this is not an acceptable replacement for a 84 tube.
Asked by Anonymous on March 16th, 2018.
Matt H
March 23rd, 2018
Please contact customer service at: [email protected].
Asked by Anonymous on February 22nd, 2020.
February 24th, 2020
Staff Member
Yes, the 5U4 tube is included in the list of tubes this will replace and the GB simply indicates a standard 5U4 with a glass bottle.
Asked by Anonymous on January 7th, 2022.
January 7th, 2022
Staff Member
The YJR is a silicon diode rectifier and does not produce voltage sag.

Product Reviews

5.00 out of 5 based on 4 reviews
Randy K - April 12th, 2021
5 out of 5

A very nice alternative to the stock rectifier tube in my silver face Princeton Reverb.

The Yellow Jacket isn't necessarily better in *all* situations -- at lower gain it doesn't really improve my tone or the response of my amp. Where it shines, though.. is when I crank up the amp -- it smooths the rough edges of a hard pick attack and transitions into a nice sustain. At higher amp gain, the Yellowjacket makes my Princeton sound a bit more refined as well as easier to record.

For gigging this is probably a no brainer and I wouldn't think twice about using it. Solid state adds an element reliability and I imagine the smoother high gain attack probably makes things a bit easier on the sound guy/girl.

kb - February 5th, 2021
5 out of 5

Great for tightening up the bottom end of a Tweed.

Les Leoniak - January 29th, 2021
5 out of 5

Works great. Easy drop in replacement. Installed it in my 59 Bassman Ltd. Greatly improves the attack of the amp. I wasn’t big on the tube sag. Increases the amp output as well. I feel it made the amp more responsive and I installed this as part of a full re-tube and re-bias. Increases the plate voltage by about 10 volts. Seems like a well made unit.

Dave Swinford - September 13th, 2020
5 out of 5

I put this in my 50 year old Harmony 410A amplifier. I wasn't 100% sure how well it would work but it works PERFECTLY. Now my first amplifier from childhood that ended back in my hands after many many years is functioning perfectly.