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Vacuum Tube - EL844, 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.

Matched versions of this tube use Apex Matching

RoHS Compliant

SKU:

T-EL844-JJ

Item ID:

004862

Brand:

JJ Electronics, Apex Matched

Type:

Power

Part Numbers
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

Measurements by Type
Measurements by Item

Product Measurements by Type
Body Height		71.4 mm
Cathode Current (I_k)		≤ 60 mA
Filament Current (I_f)		0.76 A
Filament Voltage (U_f)		6.3 V
Grid 1 to filament capacitance (c_g1f)		0.15 pF
Grid Circuit Resistance 1 (R_g1), Automatic Bias		1 MΩ
Grid Circuit Resistance 1 (R_g1), Fixed Bias		0.5 MΩ
Grid Voltage 1 (U_g1)		≥ -100 V, -7.3 V typical
Grid Voltage 2 (U_g2)		≤ 300 V, 250 V typical
Grid to Cathode Capacitance (c_g/k)		10.8 pF
Grid to Plate Capacitance (c_a/g)		0.1 pF
Heater to cathode voltage (U_k/f)		≤ 100 V
Internal Resistance (R_i)		0.1 MΩ
Item Diameter		22 mm
Item Height		77.8 mm
Plate Capacitance (c_a)		6.6 pF
Plate Current (I_a)		10 mA
Plate Dissipation (W_a)		≤ 9 W
Plate Voltage (U_a)		≤ 300 V, 250 V typical
Transconductance (S)		6.5 mA/V

Packaging Information
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.

Product Measurements by Item
T-EL844-JJ-MP - Apex Matched Pair version	Body Height	71.4 mm
	Cathode Current (I_k)	≤ 60 mA
	Filament Current (I_f)	0.76 A
	Filament Voltage (U_f)	6.3 V
	Grid 1 to filament capacitance (c_g1f)	0.15 pF
	Grid Circuit Resistance 1 (R_g1), Automatic Bias	1 MΩ
	Grid Circuit Resistance 1 (R_g1), Fixed Bias	0.5 MΩ
	Grid Voltage 1 (U_g1)	≥ -100 V, -7.3 V typical
	Grid Voltage 2 (U_g2)	≤ 300 V, 250 V typical
	Grid to Cathode Capacitance (c_g/k)	10.8 pF
	Grid to Plate Capacitance (c_a/g)	0.1 pF
	Heater to cathode voltage (U_k/f)	≤ 100 V
	Internal Resistance (R_i)	0.1 MΩ
	Item Diameter	22 mm
	Item Height	77.8 mm
	Plate Capacitance (c_a)	6.6 pF
	Plate Current (I_a)	10 mA
	Plate Dissipation (W_a)	≤ 9 W
	Plate Voltage (U_a)	≤ 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 (I_k)	≤ 60 mA
	Filament Current (I_f)	0.76 A
	Filament Voltage (U_f)	6.3 V
	Grid 1 to filament capacitance (c_g1f)	0.15 pF
	Grid Circuit Resistance 1 (R_g1), Automatic Bias	1 MΩ
	Grid Circuit Resistance 1 (R_g1), Fixed Bias	0.5 MΩ
	Grid Voltage 1 (U_g1)	≥ -100 V, -7.3 V typical
	Grid Voltage 2 (U_g2)	≤ 300 V, 250 V typical
	Grid to Cathode Capacitance (c_g/k)	10.8 pF
	Grid to Plate Capacitance (c_a/g)	0.1 pF
	Heater to cathode voltage (U_k/f)	≤ 100 V
	Internal Resistance (R_i)	0.1 MΩ
	Item Diameter	22 mm
	Item Height	77.8 mm
	Plate Capacitance (c_a)	6.6 pF
	Plate Current (I_a)	10 mA
	Plate Dissipation (W_a)	≤ 9 W
	Plate Voltage (U_a)	≤ 300 V, 250 V typical
	Transconductance (S)	6.5 mA/V
T-EL844-JJ - Single version	Body Height	71.4 mm
	Cathode Current (I_k)	≤ 60 mA
	Filament Current (I_f)	0.76 A
	Filament Voltage (U_f)	6.3 V
	Grid 1 to filament capacitance (c_g1f)	0.15 pF
	Grid Circuit Resistance 1 (R_g1), Automatic Bias	1 MΩ
	Grid Circuit Resistance 1 (R_g1), Fixed Bias	0.5 MΩ
	Grid Voltage 1 (U_g1)	≥ -100 V, -7.3 V typical
	Grid Voltage 2 (U_g2)	≤ 300 V, 250 V typical
	Grid to Cathode Capacitance (c_g/k)	10.8 pF
	Grid to Plate Capacitance (c_a/g)	0.1 pF
	Heater to cathode voltage (U_k/f)	≤ 100 V
	Internal Resistance (R_i)	0.1 MΩ
	Item Diameter	22 mm
	Item Height	77.8 mm
	Plate Capacitance (c_a)	6.6 pF
	Plate Current (I_a)	10 mA
	Plate Dissipation (W_a)	≤ 9 W
	Plate Voltage (U_a)	≤ 300 V, 250 V typical
	Transconductance (S)	6.5 mA/V

Specification Sheet	All Models

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Specification Sheet

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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.

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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.

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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.

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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.

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1 answers So I'm assuming this will work very well in a vox ac4?

Asked by Anonymous on October 18th, 2017.

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Matt H.

October 18th, 2017

Staff Member

If you are looking for a lowered powered EL84 then this would be a good choice.

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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.

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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.

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Product Reviews

5.00 out of 5 based on 6 reviews

Al Schultz - January 27th, 2020

5 out of 5

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

HC - February 26th, 2016

5 out of 5

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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.

sbrenn01 - January 6th, 2016

5 out of 5

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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.

Pete Davis - July 20th, 2015

5 out of 5

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

Nathan Zapotocky - September 15th, 2014

5 out of 5

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liking this a lot

Eric S. - September 10th, 2014

5 out of 5

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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.