Vacuum Tube - EL844, JJ Electronics
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Starting at: $18.25
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The JJ Electronic EL844 is a variation on the classic tube which reduces the overall headroom by 25%. With the reduced power, hitting that rich distortion that the EL84 is notorious for is more manageable. This tube will hit full saturated power tube sounds without having to crank the amps volume as high which makes them a great choice for recording as well as home / bedroom use.
Matched versions of this tube use Apex Matching
RoHS Compliant
| Single or Matched | Our Part Number | UPC/EAN | JJ Electronics Part Number |
|---|---|---|---|
| Apex Matched Pair | T-EL844-JJ-MP | 609722127455 | |
| Apex Matched Quad | T-EL844-JJ-MQ | 609722127462 | |
| Single | T-EL844-JJ | 609722127448 | EL844 |
| Body Height | 71.4 mm | |
| Cathode Current (Ik) | ≤ 60 mA | |
| Filament Current (If) | 0.76 A | |
| Filament Voltage (Uf) | 6.3 V | |
| 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 | 0.5 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) | 10.8 pF | |
| Grid to Plate Capacitance (ca/g) | 0.1 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 100 V | |
| Internal Resistance (Ri) | 0.1 MΩ | |
| Item Diameter | 22 mm | |
| Item Height | 77.8 mm | |
| Plate Capacitance (ca) | 6.6 pF | |
| Plate Current (Ia) | 10 mA | |
| Plate Dissipation (Wa) | ≤ 9 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 6.5 mA/V |
| Packaging Dimensions | Apex Matched Pair version | T-EL844-JJ-MP | 3.6 in. × 2 in. × 1 in. |
| Apex Matched Quad version | T-EL844-JJ-MQ | 3.6 in. × 2 in. × 2 in. | |
| Single version | T-EL844-JJ | 1 in. × 1 in. × 3.6 in. | |
| Weight (Packaging) | Apex Matched Pair version | T-EL844-JJ-MP | 0.08 lbs. |
| Apex Matched Quad version | T-EL844-JJ-MQ | 0.16 lbs. | |
| Single version | T-EL844-JJ | 0.04 lbs. |
| T-EL844-JJ-MP - Apex Matched Pair version | Body Height | 71.4 mm |
| Cathode Current (Ik) | ≤ 60 mA | |
| Filament Current (If) | 0.76 A | |
| Filament Voltage (Uf) | 6.3 V | |
| 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 | 0.5 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) | 10.8 pF | |
| Grid to Plate Capacitance (ca/g) | 0.1 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 100 V | |
| Internal Resistance (Ri) | 0.1 MΩ | |
| Item Diameter | 22 mm | |
| Item Height | 77.8 mm | |
| Plate Capacitance (ca) | 6.6 pF | |
| Plate Current (Ia) | 10 mA | |
| Plate Dissipation (Wa) | ≤ 9 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 6.5 mA/V | |
| T-EL844-JJ-MQ - Apex Matched Quad version | Body Height | 71.4 mm |
| Cathode Current (Ik) | ≤ 60 mA | |
| Filament Current (If) | 0.76 A | |
| Filament Voltage (Uf) | 6.3 V | |
| 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 | 0.5 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) | 10.8 pF | |
| Grid to Plate Capacitance (ca/g) | 0.1 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 100 V | |
| Internal Resistance (Ri) | 0.1 MΩ | |
| Item Diameter | 22 mm | |
| Item Height | 77.8 mm | |
| Plate Capacitance (ca) | 6.6 pF | |
| Plate Current (Ia) | 10 mA | |
| Plate Dissipation (Wa) | ≤ 9 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 6.5 mA/V | |
| T-EL844-JJ - Single version | Body Height | 71.4 mm |
| Cathode Current (Ik) | ≤ 60 mA | |
| Filament Current (If) | 0.76 A | |
| Filament Voltage (Uf) | 6.3 V | |
| 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 | 0.5 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) | 10.8 pF | |
| Grid to Plate Capacitance (ca/g) | 0.1 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 100 V | |
| Internal Resistance (Ri) | 0.1 MΩ | |
| Item Diameter | 22 mm | |
| Item Height | 77.8 mm | |
| Plate Capacitance (ca) | 6.6 pF | |
| Plate Current (Ia) | 10 mA | |
| Plate Dissipation (Wa) | ≤ 9 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 6.5 mA/V |
 Specification Sheet | All Models |
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Questions and Answers
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1 answers
I would like to quiet down my old stereo amp (anything above 2 is too loud). Would a set of these help reduce the gain, or would replacing the 12AX7's with 12AT7's be a better strategy?
Asked by scottjensen on March 7th, 2016.
March 8th, 2016
Staff MemberTop Contributor
This tube would definitely help to reduce the power. In terms of dropping overall gain the 12AT7 method usually works fairly well however since it is changing the gain structure results may vary. It's best to try it out and see if it's pleasing to you.
1 answers
What does "more balanced frequency response" mean? How does that translate into tube parameters (gm, rp, mu, Cgk, mug1g2...)?
Asked by Anonymous on June 20th, 2016.
June 20th, 2016
Staff Member
A more balanced frequency response means that this tube will be more balanced in the lows, mids, and highs, compared to a EL84.
1 answers
So I'm assuming this will work very well in a vox ac4?
Asked by Anonymous on October 18th, 2017.
October 18th, 2017
Staff Member
If you are looking for a lowered powered EL84 then this would be a good choice.
1 answers
I’m about ready to order this for my vox ac4. Would I have to have the bias adjusted or just plug it in and play?
Asked by Anonymous on November 3rd, 2017.
November 3rd, 2017
Staff Member
With any retube, you may need to make adjustments to your amp depending on the type of bias it has. Your amp will either be fixed adjustable bias (has bias pot on the back of the amp) , Fixed non-adjustable bias (bias is fixed by a resistor in your amp), or cathode bias (self biasing no bias required). The manual for your amp should be able to tell you what type of bias you have. Rebiasing an amp is something that should be done by an experienced tech.
Product Reviews
This matched pair went into a VOX AC-15. It was suffering from microphonic issues. Sounds great now - classic VOX tone.
Put a matched pair of these in my amp along with a new greenback. I am very happy with the results. I've another amp this is now under the same renovations more or less. Price is good and delivery fast. Five stars.
Arrived promptly, well packaged!! This tube swapped out easily on my single-tube Class A amp. I like it's chime-y harmonics. It's not as powerful as an EL-84 but it's no weak sister either. Best described as "breaks up a bit sooner" to my ears.
Cool tubes. Do what they say. They're basically quieter EL84s. The break up earlier too. Sound great.
liking this a lot
In my Jet City 20HV it does sound okay with the bias setting for the stock Chinese tubes. At Clean levels, it does seem more transparent than stock. Turning up the volume, you find the power amp break-up point quicker. Since my amp stays at home now, this is a good thing. I now call my amp a JCA 15HV.