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 |
Product Reviews
This tube does what it claims to do. I have a 30 watt amp that I can turn up at home. It sounds good like you're playing really loud but you're only kind of loud.
They don't work in a Peavey Classic 30. From other reviews, they may sound good on the overdrive channel, but I only use the clean channel. Raspy, harsh, no sustain. Apparently it is a biasing issue. If you are thinking of taming a Classic 30, try something else.
Put these in a fender pro junior 111. great driven sound comes on a lot earlier.
I tried a matched pair of these jj tesla el-844 lower power version in my Egnater Rebel 30 and bias about 37ma a pair.
The RI mullard el84 pair was in there before is boxed up and put away after hearing the even harmonic nature of the JJ tubes.
A much more natural tube sound and the highs were spot on and no harsh peaks in the highs were there.
If i push the mullard hard they are good,but mostly i dont need that much power right now.
So id say pushed there both great tubes when overdriven and the JJ crunches real nice and a creamy grind on the mullards are just different flavors
Right now im considering a pair for my Rebel 20 head .
Rubys are to crispy brite for my mean 90 pickups and my standard jj tesla el84 tubes didnt seem to be as favorable to my ears as these el-844 tubes are even at low volume practice nice tubes they are.
I will say the mullards are my second choice now .
If i right a review im impressed or very dissapointed .
I luv this new el-844....
This tube is a 'lower rated' tube with a 9 watt output compared to the standard (rated) 12 watt output of any other EL84. However, everyone who can count will notice that 9 +9 = 3 more watts than the 15 which every amp that uses a single pair of EL84 tubes is rated for. 4 of them will produce 36 watts which is 6 more than an AC 30 is rated for, etc.,etc.,As far as this EL-844 goes, ive been paying close attention to the 4 newest JJ's; the 5Y3GT, 6CA7,6550 and this one, and its prety obvious to me that JJ has a thing for old American GE tubes right now....AWSOME!!!! GE was the greatest,and this one seems like a stab at reproducing the GE - 6BQ5. GO for it JJ.More please. How about a GE 12AY7? All the afore mentioned tubes rock and who needs another Chinese "Just Like Telefunken" tube that has about as much resemblance to a Telefunken as does a Christmas tree bulb.
I have a Epiphone Valve Jr V3 half stack with a JP1 mod and wanted to reduce the volume and gain for a basement practice space. After trying a combination of new and stock tubes, I replaced the stock EH 12AX7 and JJ EL84 tubes with the JJ 12AT7 and the new JJ EL844. I like the new brighter and cleaner sound that starts breaking up at about 1:00. My Hardwire OD pedal provides that extra crunch and low end when I want it. Thanks to JJ for another new tube option.