Yellow Jacket Tube Converters

Yellow Jacket® tube converters allow EL84 power tubes to be used in place of the most common guitar amp power tubes, including 6L6, EL34, 6V6, 7027, 6550, and 7591. Most Yellow Jacket® converters provide a substantial output power reduction and a "self-bias" Class A configuration for the EL84 so that no bias adjustment is required. Yellow Jacket® converters are like getting a whole new amp.
P-YJNOS Tube Converter - Yellow Jacket®, YJNOS
The Yellow Jacket® NOS (New Old Stock) Tube Converter is a converter made for use in most amplifiers under 100 watts and using 6L6, EL34, 7027, or 6V6 output tubes. The converter lowers the overall power in your amplifier and gives your amp a unique vintage tone. This NOS Yellow Jacket is designed with an NOS 6AQ5 seven-pin miniature beam power tube, which is included with the converter. The 6AQ5 was used on many vintage practice guitar amps in the 1950s as well as many film projectors in the past. This tube is popular with DIY amp builders who often convert old film projectors into guitar amps. While electronically equivalent to the 6V6 with a slightly lower power rating, the 6AQ5 has its own unique vintage tone that sets it apart from its eight-pin big brother. As with all Yellow Jacket® converters, the 6AQ5 Yellow Jacket converter will operate in a Class-A self-adjusting cathode-bias circuit. All Yellow Jacket® Tube Converters are handmade in the USA.
Starting at $133.50
Partially Out of Stock
P-YJSHORT-T Tube Converter - Yellow Jacket®, YJShort, Triode version
The YJShort is shorter than the standard YJS converter, allowing for use in amps that do not have room for the standard converters. It is a specialized, current-limiting/voltage-conditioning adapter for use in most 20 to 100 watt amps which use 6L6, EL34, 6550 or 6V6 output tubes. All Yellow Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • All Yellow Jacket® 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: 70% to 90%.
  • Safe for all common amplifiers and transformers.

Yellow Jacket® 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.
Starting at $54.59
P-YJSHORT Tube Converter - Yellow Jacket®, YJShort
The YJShort is shorter than the standard YJS converter, allowing for use in amps that do not have room for the standard converters. It is a specialized, current-limiting/voltage-conditioning adapter for use in most 20 to 100 watt amps which use 6L6, EL34, 6550 or 6V6 output tubes. All Yellow Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • All Yellow Jacket® 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 Jacket® 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.
Starting at $54.59
P-SAYJ-SHORT Tube Converter - Yellow Jacket®, YJShort, Converter Only
Converter-only version of the P-YJShort. Tubes not included. Requires an EL84 vacuum tube, such as:
  • T-EL84-EH (Electro-Harmonix)
  • T-EL84-GEN (Genalex)
  • T-EL84-JJ (JJ Electronic)
  • T-EL84-MUL (Mullard)
  • T-EL84-MP-PV (Peavey)
  • T-EL84-S-MP-GT (Groove Tubes)
  • T-EL84-SOVT (Sovtek)
  • T-EL84-TAD (Tube Amp Doctor)
  • T-EL84-TUNG (Tung-Sol)
  • T-EL84_6BQ5 (NOS)
  • T-EL844-JJ (JJ Electronic EL844)
  • T-EL84M-SOVT (Sovtek EL84M)

We also sell an EL84 sampler set containing 9 EL84 tubes:
  • T-EL84-SET

The YJShort is shorter than the standard YJS converter, allowing for use in amps that do not have room for the standard converters.
$45.00
P-SAYJ-T-SHORT Tube Converter - Yellow Jacket®, YJShort, Triode Version, converter only
Converter-only version of the P-YJSHORT-T. Tubes not included. Requires an EL84 vacuum tube, such as:
  • T-EL84-EH (Electro-Harmonix)
  • T-EL84-GEN (Genalex)
  • T-EL84-JJ (JJ Electronic)
  • T-EL84-MUL (Mullard)
  • T-EL84-MP-PV (Peavey)
  • T-EL84-S-MP-GT (Groove Tubes)
  • T-EL84-SOVT (Sovtek)
  • T-EL84-TAD (Tube Amp Doctor)
  • T-EL84-TUNG (Tung-Sol)
  • T-EL84_6BQ5 (NOS)
  • T-EL844-JJ (JJ Electronic EL844)
  • T-EL84M-SOVT (Sovtek EL84M)

We also sell an EL84 sampler set containing 9 EL84 tubes:
  • T-EL84-SET

The YJShort is shorter than the standard YJS converter, allowing for use in amps that do not have room for the standard converters. It is a specialized, current-limiting/voltage-conditioning adapter for use in most 20 to 100 watt amps which use 6L6, EL34, 6550 or 6V6 output tubes.
$45.00
P-YJS-T Tube Converter - Yellow Jacket®, YJS, Triode version
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 Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • All Yellow Jacket® 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: 70% to 90%.
  • Safe for all common amplifiers and transformers.

Yellow Jacket® 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.
Starting at $44.95
P-YJ20 Tube Converter - Yellow Jacket®, YJ20
The YJ20 is for use in most amplifiers using 6V6 output tubes. The YJ20 is similar to the YJC but does not drop the plate and screen voltages. It is meant for use in lower power output amps (20 watts or less) when no power reduction is desired. The ground wire connects to the chassis-ground for cathode-biased amplifiers. All Yellow Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • All Yellow Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • Converts most audio amplifiers with 6V6s and similar-based tubes to EL84s without modification or rebiasing.
  • Converts: Class AB to Class A operation
  • Drops Output Power: Does not drop power.
  • Safe for all common amplifiers and transformers.

Yellow Jacket® 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.
Starting at $44.95
P-YJS-X Tube Converter - Yellow Jacket®, YJS
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 Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • All Yellow Jacket® 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 Jacket® 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.
Starting at $44.95
P-YJC Tube Converter - Yellow Jacket®, YJC
The YJC is similar to the YJS, but for use in amps with cathode-biased power tubes. Cathode-biased power tubes have a bias resistor connected from their cathode to ground. The ground wire of the YJC is used to bypass the amp’s cathode bias components so the Yellow Jacket® converter’s internal bias components are used instead. All Yellow Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • All Yellow Jacket® 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 Jacket® 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.
Starting at $44.95
P-YJC-T Tube Converter - Yellow Jacket®, YJC, Triode version
The YJC is similar to the YJS, but for use in amps with cathode-biased power tubes. Cathode-biased power tubes have a bias resistor connected from their cathode to ground. The ground wire of the YJC is used to bypass the amp’s cathode bias components so the Yellow Jacket® converter’s internal bias components are used instead. All Yellow Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • All Yellow Jacket® 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: 70% to 90%.
  • Safe for all common amplifiers and transformers.

Yellow Jacket® 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.
Starting at $89.89
Partially Out of Stock
P-YJ20-T Tube Converter - Yellow Jacket®, YJ20, Triode version
The YJ20 is for use in most amplifiers using 6V6 output tubes. The YJ20 is similar to the YJC but does not drop the plate and screen voltages. It is meant for use in lower power output amps (20 watts or less) when no power reduction is desired. The ground wire connects to the chassis-ground for cathode-biased amplifiers. All Yellow Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • All Yellow Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • Converts most audio amplifiers with 6V6s and similar-based tubes to EL84s without modification or rebiasing.
  • Converts: Class AB to Class A operation
  • Drops Output Power:50%.
  • Safe for all common amplifiers and transformers.

Yellow Jacket® 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.
Starting at $89.89
Partially Out of Stock
P-YJUNI-T Tube Converter - Yellow Jacket®, YJUni, Triode version
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 Jacket®. 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.
Starting at $38.50
P-YJUNI Tube Converter - Yellow Jacket®, YJUni
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 Jacket®. 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.
Starting at $38.50
P-YJ7591-T Tube Converter - Yellow Jacket®, YJ7591, Triode version
The YJ7591 is a specialized, current-limiting/voltage-conditioning adapter for use in most amplifiers that use 7591 output tubes. Only the triode version will provide a noticeable power reduction. The ground wire connects to chassis-ground for cathode-biased amplifiers. All Yellow Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • All Yellow Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • Converts most audio amplifiers with 7591s and similar-based tubes to EL84s without modification or rebiasing.
  • Converts: Class AB to Class A operation
  • Drops Output Power: 50%.
  • Safe for all common amplifiers and transformers.

Yellow Jacket® 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.
Starting at $76.41
Partially Out of Stock
P-SAYJ-T-UNI Tube Converter - Yellow Jacket®, YJUni, Triode Version, converter only
Converter-only version of the P-YJUNI-T. Tubes not included. Requires an EL84 vacuum tube, such as:
  • T-EL84-EH (Electro-Harmonix)
  • T-EL84-GEN (Genalex)
  • T-EL84-JJ (JJ Electronic)
  • T-EL84-MUL (Mullard)
  • T-EL84-MP-PV (Peavey)
  • T-EL84-S-MP-GT (Groove Tubes)
  • T-EL84-SOVT (Sovtek)
  • T-EL84-TAD (Tube Amp Doctor)
  • T-EL84-TUNG (Tung-Sol)
  • T-EL84_6BQ5 (NOS)
  • T-EL844-JJ (JJ Electronic EL844)
  • T-EL84M-SOVT (Sovtek EL84M)

We also sell an EL84 sampler set containing 9 EL84 tubes:
  • T-EL84-SET

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 Jacket® converter. It is designed for use in lower power output amps (20 watts or less) when no power reduction is desired.
$37.50
P-SAYJUNI Tube Converter - Yellow Jacket®, YJUni, Converter Only
Converter-only version of the P-YJUNI. Tubes not included. Requires an EL84 vacuum tube, such as:
  • T-EL84-EH (Electro-Harmonix)
  • T-EL84-GEN (Genalex)
  • T-EL84-JJ (JJ Electronic)
  • T-EL84-MUL (Mullard)
  • T-EL84-MP-PV (Peavey)
  • T-EL84-S-MP-GT (Groove Tubes)
  • T-EL84-SOVT (Sovtek)
  • T-EL84-TAD (Tube Amp Doctor)
  • T-EL84-TUNG (Tung-Sol)
  • T-EL84_6BQ5 (NOS)
  • T-EL844-JJ (JJ Electronic EL844)
  • T-EL84M-SOVT (Sovtek EL84M)

We also sell an EL84 sampler set containing 9 EL84 tubes:
  • T-EL84-SET

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 Jacket® converters. It is designed for use in lower power output amps (20 watts or less) when no power reduction is desired.
$37.50
P-SAYJ Tube Converter - Yellow Jacket®, YJS, Converter Only
Converter-only version of the P-YJS. Tubes not included. Requires an EL84 vacuum tube, such as:
  • T-EL84-EH (Electro-Harmonix)
  • T-EL84-GEN (Genalex)
  • T-EL84-JJ (JJ Electronic)
  • T-EL84-MUL (Mullard)
  • T-EL84-MP-PV (Peavey)
  • T-EL84-S-MP-GT (Groove Tubes)
  • T-EL84-SOVT (Sovtek)
  • T-EL84-TAD (Tube Amp Doctor)
  • T-EL84-TUNG (Tung-Sol)
  • T-EL84_6BQ5 (NOS)
  • T-EL844-JJ (JJ Electronic EL844)
  • T-EL84M-SOVT (Sovtek EL84M)

We also sell an EL84 sampler set containing 9 EL84 tubes:
  • T-EL84-SET

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.
$37.50
P-SAYJ-C Tube Converter - Yellow Jacket®, YJC, Converter Only
Converter-only version of the P-YJC. Tubes not included. Requires an EL84 vacuum tube, such as:
  • T-EL84-EH (Electro-Harmonix)
  • T-EL84-GEN (Genalex)
  • T-EL84-JJ (JJ Electronic)
  • T-EL84-MUL (Mullard)
  • T-EL84-MP-PV (Peavey)
  • T-EL84-S-MP-GT (Groove Tubes)
  • T-EL84-SOVT (Sovtek)
  • T-EL84-TAD (Tube Amp Doctor)
  • T-EL84-TUNG (Tung-Sol)
  • T-EL84_6BQ5 (NOS)
  • T-EL844-JJ (JJ Electronic EL844)
  • T-EL84M-SOVT (Sovtek EL84M)

We also sell an EL84 sampler set containing 9 EL84 tubes:
  • T-EL84-SET

The YJC is similar to the YJS, but for use in amps with cathode-biased power tubes. Cathode-biased power tubes have a bias resistor connected from their cathode to ground. The ground wire of the YJC is used to bypass the amp’s cathode bias components so the Yellow Jacket® converter’s internal bias components are used instead.
$37.50
P-SAYJ-TRIODE Tube Converter - Yellow Jacket®, YJS, Triode Version, converter only
Converter-only version of the P-YJS-T. Tubes not included. Requires an EL84 vacuum tube, such as:
  • T-EL84-EH (Electro-Harmonix)
  • T-EL84-GEN (Genalex)
  • T-EL84-JJ (JJ Electronic)
  • T-EL84-MUL (Mullard)
  • T-EL84-MP-PV (Peavey)
  • T-EL84-S-MP-GT (Groove Tubes)
  • T-EL84-SOVT (Sovtek)
  • T-EL84-TAD (Tube Amp Doctor)
  • T-EL84-TUNG (Tung-Sol)
  • T-EL84_6BQ5 (NOS)
  • T-EL844-JJ (JJ Electronic EL844)
  • T-EL84M-SOVT (Sovtek EL84M)

We also sell an EL84 sampler set containing 9 EL84 tubes:
  • T-EL84-SET

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).
$37.50
P-YJR Solid State Rectifier - Yellow Jacket® YJR, For 5AR4, 5U4, 5Y3
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 come with 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.
$14.95
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