Vacuum Tube - EL844, JJ Electronics

Vacuum Tube - EL844, JJ Electronics

JJ Electronics
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Starting at: $12.50
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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.

Apex Tube Matching
Matched versions of this tube use Apex Matching
RoHS Compliant
SKU:
T-EL844-JJ
Item ID:
004862
Brand:
JJ Electronics, Apex Matched
Type:
Part Numbers
Single or MatchedOur Part NumberUPC/EANJJ Electronics Part Number
Apex Matched PairT-EL844-JJ-MP609722127455
Apex Matched QuadT-EL844-JJ-MQ609722127462
SingleT-EL844-JJ609722127448 EL844
Product Measurements by Type
Body Height71.4 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 Bias1 MΩ
Grid Circuit Resistance 1 (Rg1), Fixed Bias0.5 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 Diameter22 mm
Item Height77.8 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 Information
Packaging DimensionsApex Matched Pair versionT-EL844-JJ-MP3.6 in. × 2 in. × 1 in.
Apex Matched Quad versionT-EL844-JJ-MQ3.6 in. × 2 in. × 2 in.
Single versionT-EL844-JJ1 in. × 1 in. × 3.6 in.
Weight (Packaging)Apex Matched Pair versionT-EL844-JJ-MP0.08 lbs.
Apex Matched Quad versionT-EL844-JJ-MQ0.16 lbs.
Single versionT-EL844-JJ0.04 lbs.
Product Measurements by Item
T-EL844-JJ-MP - Apex Matched Pair versionBody Height71.4 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 Bias1 MΩ
Grid Circuit Resistance 1 (Rg1), Fixed Bias0.5 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 Diameter22 mm
Item Height77.8 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 versionBody Height71.4 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 Bias1 MΩ
Grid Circuit Resistance 1 (Rg1), Fixed Bias0.5 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 Diameter22 mm
Item Height77.8 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 versionBody Height71.4 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 Bias1 MΩ
Grid Circuit Resistance 1 (Rg1), Fixed Bias0.5 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 Diameter22 mm
Item Height77.8 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

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet391.17 KB

Questions and Answers

Click each question to see its answers.
Asked by scottjensen on March 7th, 2016.
JustinG
March 8th, 2016
Staff Member
Top 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.
Asked by Anonymous on June 20th, 2016.
Matt H.
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.
Asked by Anonymous on October 18th, 2017.
Matt H.
October 18th, 2017
Staff Member
If you are looking for a lowered powered EL84 then this would be a good choice.
Asked by Anonymous on November 3rd, 2017.
Matt H.
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

5.00 out of 5 based on 6 reviews
- January 27th, 2020
5 out of 5

This matched pair went into a VOX AC-15. It was suffering from microphonic issues. Sounds great now - classic VOX tone.

- February 26th, 2016
5 out of 5

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.

- January 6th, 2016
5 out of 5

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.

- July 20th, 2015
5 out of 5

Cool tubes. Do what they say. They're basically quieter EL84s. The break up earlier too. Sound great.

- September 15th, 2014
5 out of 5

liking this a lot

- September 10th, 2014
5 out of 5

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.