Vacuum Tube - EL84, JJ Electronics
The JJ Electronic EL84 is a solidly built EL84 / 6BQ5 with excellent tonal qualities. JJ’s rugged construction of this tube offers high reliability without any compromise to the sound. This tube has solid lows with warm bright mids and shimmery highs. When saturated the harmonics are rich and dynamic. The JJ EL84 nails the classic sound of this tube. This tube can replace any EL84 or 6BQ5 tube.
Matched versions of this tube use Apex Matching
Choose burned-in tubes for maximum stability and performance.
RoHS Compliant
Accessory Items:
| Single or Matched | Our Part Number | UPC/EAN | JJ Electronics Part Number |
|---|---|---|---|
| Apex Matched Pair | T-EL84-JJ-MP | 609722123105 | |
| Apex Matched Quad | T-EL84-JJ-MQ | 609722123112 | |
| Apex Burned-In Matched Pair | T-EL84-JJ-MPB | 841358108914 | |
| Apex Burned-In Matched Quad | T-EL84-JJ-MQB | 841358108921 | |
| Single | T-EL84-JJ | 609722123099 | EL84 - 6BQ5 |
| Body Height | 71.4 mm | |
| Cathode Current (Ik) | ≤ 65 mA | |
| Filament Current (If) | 0.76 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 19 | |
| Grid 1 to filament capacitance (cg1f) | 0.15 pF | |
| Grid Circuit Resistance 1 (Rg1), Automatic Bias | 1 MΩ | |
| Grid Circuit Resistance 1 (Rg1), Fixed Bias | 0.3 MΩ | |
| Grid Voltage 1 (Ug1) | ≥ -100 V, -7.3 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 300 V, 250 V typical | |
| Grid to Cathode Capacitance (cg/k) | 10 pF | |
| Grid to Plate Capacitance (ca/g) | 0.6 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 100 V | |
| Internal Resistance (Ri) | 40 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 77.8 mm | |
| Plate Capacitance (ca) | 5.1 pF | |
| Plate Current (Ia) | 48 mA | |
| Plate Dissipation (Wa) | ≤ 12 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 11.3 mA/V |
| Packaging Dimensions | Apex Burned-In Matched Pair version | T-EL84-JJ-MPB | 1 in. × 2.1 in. × 3.8 in. |
| Apex Burned-In Matched Quad version | T-EL84-JJ-MQB | 2.1 in. × 2.1 in. × 3.8 in. | |
| Apex Matched Pair version | T-EL84-JJ-MP | 1 in. × 2.1 in. × 3.8 in. | |
| Apex Matched Quad version | T-EL84-JJ-MQ | 2.1 in. × 2.1 in. × 3.8 in. | |
| Single version | T-EL84-JJ | 1 in. × 1 in. × 3.6 in. | |
| Weight (Packaging) | Apex Burned-In Matched Pair version | T-EL84-JJ-MPB | 0.08 lbs. |
| Apex Burned-In Matched Quad version | T-EL84-JJ-MQB | 0.16 lbs. | |
| Apex Matched Pair version | T-EL84-JJ-MP | 0.08 lbs. | |
| Apex Matched Quad version | T-EL84-JJ-MQ | 0.16 lbs. | |
| Single version | T-EL84-JJ | 0.04 lbs. |
| T-EL84-JJ-MP - Apex Matched Pair version | Body Height | 71.4 mm |
| Cathode Current (Ik) | ≤ 65 mA | |
| Filament Current (If) | 0.76 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 19 | |
| Grid 1 to filament capacitance (cg1f) | 0.15 pF | |
| Grid Circuit Resistance 1 (Rg1), Automatic Bias | 1 MΩ | |
| Grid Circuit Resistance 1 (Rg1), Fixed Bias | 0.3 MΩ | |
| Grid Voltage 1 (Ug1) | ≥ -100 V, -7.3 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 300 V, 250 V typical | |
| Grid to Cathode Capacitance (cg/k) | 10 pF | |
| Grid to Plate Capacitance (ca/g) | 0.6 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 100 V | |
| Internal Resistance (Ri) | 40 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 77.8 mm | |
| Plate Capacitance (ca) | 5.1 pF | |
| Plate Current (Ia) | 48 mA | |
| Plate Dissipation (Wa) | ≤ 12 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 11.3 mA/V | |
| T-EL84-JJ-MQ - Apex Matched Quad version | Body Height | 71.4 mm |
| Cathode Current (Ik) | ≤ 65 mA | |
| Filament Current (If) | 0.76 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 19 | |
| Grid 1 to filament capacitance (cg1f) | 0.15 pF | |
| Grid Circuit Resistance 1 (Rg1), Automatic Bias | 1 MΩ | |
| Grid Circuit Resistance 1 (Rg1), Fixed Bias | 0.3 MΩ | |
| Grid Voltage 1 (Ug1) | ≥ -100 V, -7.3 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 300 V, 250 V typical | |
| Grid to Cathode Capacitance (cg/k) | 10 pF | |
| Grid to Plate Capacitance (ca/g) | 0.6 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 100 V | |
| Internal Resistance (Ri) | 40 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 77.8 mm | |
| Plate Capacitance (ca) | 5.1 pF | |
| Plate Current (Ia) | 48 mA | |
| Plate Dissipation (Wa) | ≤ 12 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 11.3 mA/V | |
| T-EL84-JJ-MPB - Apex Burned-In Matched Pair version | Body Height | 71.4 mm |
| Cathode Current (Ik) | ≤ 65 mA | |
| Filament Current (If) | 0.76 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 19 | |
| Grid 1 to filament capacitance (cg1f) | 0.15 pF | |
| Grid Circuit Resistance 1 (Rg1), Automatic Bias | 1 MΩ | |
| Grid Circuit Resistance 1 (Rg1), Fixed Bias | 0.3 MΩ | |
| Grid Voltage 1 (Ug1) | ≥ -100 V, -7.3 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 300 V, 250 V typical | |
| Grid to Cathode Capacitance (cg/k) | 10 pF | |
| Grid to Plate Capacitance (ca/g) | 0.6 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 100 V | |
| Internal Resistance (Ri) | 40 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 77.8 mm | |
| Plate Capacitance (ca) | 5.1 pF | |
| Plate Current (Ia) | 48 mA | |
| Plate Dissipation (Wa) | ≤ 12 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 11.3 mA/V | |
| T-EL84-JJ-MQB - Apex Burned-In Matched Quad version | Body Height | 71.4 mm |
| Cathode Current (Ik) | ≤ 65 mA | |
| Filament Current (If) | 0.76 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 19 | |
| Grid 1 to filament capacitance (cg1f) | 0.15 pF | |
| Grid Circuit Resistance 1 (Rg1), Automatic Bias | 1 MΩ | |
| Grid Circuit Resistance 1 (Rg1), Fixed Bias | 0.3 MΩ | |
| Grid Voltage 1 (Ug1) | ≥ -100 V, -7.3 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 300 V, 250 V typical | |
| Grid to Cathode Capacitance (cg/k) | 10 pF | |
| Grid to Plate Capacitance (ca/g) | 0.6 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 100 V | |
| Internal Resistance (Ri) | 40 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 77.8 mm | |
| Plate Capacitance (ca) | 5.1 pF | |
| Plate Current (Ia) | 48 mA | |
| Plate Dissipation (Wa) | ≤ 12 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 11.3 mA/V | |
| T-EL84-JJ - Single version | Body Height | 71.4 mm |
| Cathode Current (Ik) | ≤ 65 mA | |
| Filament Current (If) | 0.76 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 19 | |
| Grid 1 to filament capacitance (cg1f) | 0.15 pF | |
| Grid Circuit Resistance 1 (Rg1), Automatic Bias | 1 MΩ | |
| Grid Circuit Resistance 1 (Rg1), Fixed Bias | 0.3 MΩ | |
| Grid Voltage 1 (Ug1) | ≥ -100 V, -7.3 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 300 V, 250 V typical | |
| Grid to Cathode Capacitance (cg/k) | 10 pF | |
| Grid to Plate Capacitance (ca/g) | 0.6 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 100 V | |
| Internal Resistance (Ri) | 40 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 77.8 mm | |
| Plate Capacitance (ca) | 5.1 pF | |
| Plate Current (Ia) | 48 mA | |
| Plate Dissipation (Wa) | ≤ 12 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 11.3 mA/V |
 Specification Sheet | All Models |
My Project Lists
Specifications, Files, and Documents
Questions and Answers
Click each question to see its answers.
1 answers
I bought the power matched pair and noticed that one tubes filaments glow brighter than the other, is this normal?
Asked by Anonymous on October 14th, 2016.
October 14th, 2016
Staff Member
A blue glow on the surface of the glass, mica, or metal is fine. A blue or violet cloud within the tube structure is bad.
An orange glow from the filament or cathode in the middle of the tube is normal and can vary from very bright to very dim depending on how it is covered from view by the surrounding structures. A red or orange glow on the surface of the plate is bad and is referred to as "red-plating." This is caused by setting the bias of the tube too hot.
If the tube was bad you would hear it.
1 answers
Do this work in a fender hot rod deluxe iii?
Asked by Anonymous on May 24th, 2017.
May 24th, 2017
Staff Member
If you want to use EL84's with your amp you will need to purchase the "YJS" or "YJShort" Yellow Jackets. These are pin converters that allow you to safely use EL84's in your amp.
1 answers
Will this work on Blues jr?
Asked by Anonymous on May 31st, 2018.
May 31st, 2018
Staff Member
The Blues Junior comes stock with a pair of EL84's and these would be an excellent choice for your amp.
1 answers
Are these T-EL84-JJ-mp already burned in ?
Asked by Anonymous on July 27th, 2018.
These are not burned in. Unfortunately, we do not offer a burned in version of these tubes at this time.
1 answers
Can these tubes work in a record player stereo amp From 1964? The one I pulled out was a 6BQ5 silvertone.
Asked by Anonymous on August 28th, 2018.
August 28th, 2018
Staff Member
Yes, the 6BQ5 is the American name for these tubes. As they were commonly used in European amps, the European name EL84 has become the more commonly used term.
1 answers
Can you elaborate on "burned in". What does this really mean? Is this 10 hours, 50 hours, 100 hours? Should burning in be done at high volume? It seems that there is so much nebulous terminology in this world of guitars and amplifiers. Frankly, I am a little confused.
Asked by Anonymous on November 8th, 2018.
November 9th, 2018
Staff Member
For more information on the Apex Burn In process, please visit the Apex tube matching website: https://www.apexmatching.com/apex-burn
Substitute Products
The following items can be substituted for this product. While not necessarily exactly the same, they will function as replacement items in your project.
Product Reviews
Very good sound quality and freq range. Somewhat shorter life and runs hot in our blues Jr and Ampeg Jet amps.
Fast service from this company on hard to find vacuum tubes! Still looking for 12ax7's!
Perfect product! I love that these were Apex matched and that I could find tubes. I popped one and was able to find this pair. I replace both if I drop only one - - keep them matched.
The service was fantastic, shipping was quick and secure. Great place to order tubes or any other guitar needs
I purchased a set of JJ el84s, great price and fast delivery. I’m very happy with how securely the tubes were packaged and will absolutely continue to purchase vacuum tubes from here again
Great Service and fast shipping!
A complete re-tube using JJ EL84's and 12AX7's in my Stage Right by Monoprice 15 watt amp completely restored the amp's volume and greatly improved the tone.
A friend recommended JJ tubes for my Bugera T5. I couldn't be happier. A bright sound with just enough gain.
Good solid tube that will certainly get the job done. I find they cant take the heat over time. If you really want to bring a CL30 to life and not worry about replacing every 3-4 months, go with the EH version.
JJ tubes are by far the best value on the market and they have been for some time now as far as I am concerned...and with the additional expertise of antique electronics and there Apex matching process you will be hard pressed to find anything better...just give them a try
They are really matched. I set bias for individual tubes and made them run at the same current. After couple days burned in, I rechecked, currents of each tube are still in sync, although the current increased a little bit due to burning in process. PS: the tubes were fixed biased