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 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.