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Vacuum Tube - EL84, Tube Amp Doctor
Tube Amp Doctor opted for the thickest glass possible and the heaviest construction available, just like the Russian EL84M, and combined these features with the sonically most promising cathode plate options, in order to meet and exceed the tonal quality of the EL84-Cz. Finally, Tube Amp Doctor added the gold grid wire in order to improve overall reliability. The sound can be described as very harmonic in the middle and treble frequencies, without adding too much power to the bass. The result is the best EL84 in current production.
No Compromise!
Q: When does a power tube become a Premium Selected power tube?
A: All power tubes labeled Premium Selected have passed the following tests:
- Plate Current (PC) and Amplification (TC)
- Low Noise Test
- Microphonic Test
- Sonic Tests
- Shock Tests
- Listening Tests
- Shorts & Leakage Tests
| Single or Matched | Our Part Number | UPC/EAN | Tube Amp Doctor Part Number |
|---|---|---|---|
| Matched Pair | T-EL84-TAD-MP | 609722123457 | |
| Matched Quad | T-EL84-TAD-MQ | 609722123464 | |
| Single | T-EL84-TAD | 609722123440 | RT871 |
| Body Height | 71 mm | |
| Cathode to Heater Voltage | ≤ 100 V | |
| D.C. Cathode Current, AF Power Amplifier | 65 mA | |
| D.C. Plate Voltage, AF Power Amplifier | 420 V | |
| Grid 1 (control) Voltage, Af Power Amplifier | -100 V | |
| Grid 1 Control Voltage, Class A1 | -4.8 V | |
| Grid 1 to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance | < 10.8 pF | |
| Grid 1 to Plate Capacitance | < 0.5 pF | |
| Grid 2 Dc (screen) Dissipation, Af Power Amplifier | 2 W | |
| Grid 2 Dc (screen) Voltage, Af Power Amplifier | 300 V | |
| Grid 2 Screen Voltage, Class A1 | 250 V | |
| Heater Current | 0.76 A | |
| Heater Voltage | 5.8 V - 6.8 V, 6.3 V nominal | |
| Item Diameter | 22.5 mm | |
| Item Height | 77 mm | |
| Load Resistance, Class A1 | 5.2 kΩ | |
| Output Power (POut) @ 5% Distortion, Class A1 | 5.7 W | |
| Peak AF Grid 1 Control Voltage, Class A1 | 14 V | |
| Plate Dissipation, AF power amplifier (Wa) | 12 W | |
| Plate Voltage, class A1 (Ua) | 250 V | |
| Plate to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance | < 6.5 pF | |
| Signal Plate Current, Class A1, maximum | 80 mA | |
| Transconductance, Class A1 (S) | 9 mA/V | |
| Zero Signal Grid 2 Screen Current, Class A1 | 10.8 mA | |
| Zero Signal Plate Current, Class A1 | 49.5 mA |
| Packaging Dimensions | Matched Pair version | T-EL84-TAD-MP | 1 in. × 2 in. × 3.3 in. |
| Matched Quad version | T-EL84-TAD-MQ | 1 in. × 4 in. × 3.3 in. | |
| Single version | T-EL84-TAD | 3.25 in. × 1 in. × 1 in. | |
| Weight (Packaging) | Matched Pair version | T-EL84-TAD-MP | 0.1 lbs. |
| Matched Quad version | T-EL84-TAD-MQ | 0.2 lbs. | |
| Single version | T-EL84-TAD | 0.05 lbs. |
| T-EL84-TAD - Single version | Body Height | 71 mm |
| Cathode to Heater Voltage | ≤ 100 V | |
| D.C. Cathode Current, AF Power Amplifier | 65 mA | |
| D.C. Plate Voltage, AF Power Amplifier | 420 V | |
| Grid 1 (control) Voltage, Af Power Amplifier | -100 V | |
| Grid 1 Control Voltage, Class A1 | -4.8 V | |
| Grid 1 to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance | < 10.8 pF | |
| Grid 1 to Plate Capacitance | < 0.5 pF | |
| Grid 2 Dc (screen) Dissipation, Af Power Amplifier | 2 W | |
| Grid 2 Dc (screen) Voltage, Af Power Amplifier | 300 V | |
| Grid 2 Screen Voltage, Class A1 | 250 V | |
| Heater Current | 0.76 A | |
| Heater Voltage | 5.8 V - 6.8 V, 6.3 V nominal | |
| Item Diameter | 22.5 mm | |
| Item Height | 77 mm | |
| Load Resistance, Class A1 | 5.2 kΩ | |
| Output Power (POut) @ 5% Distortion, Class A1 | 5.7 W | |
| Peak AF Grid 1 Control Voltage, Class A1 | 14 V | |
| Plate Dissipation, AF power amplifier (Wa) | 12 W | |
| Plate Voltage, class A1 (Ua) | 250 V | |
| Plate to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance | < 6.5 pF | |
| Signal Plate Current, Class A1, maximum | 80 mA | |
| Transconductance, Class A1 (S) | 9 mA/V | |
| Zero Signal Grid 2 Screen Current, Class A1 | 10.8 mA | |
| Zero Signal Plate Current, Class A1 | 49.5 mA | |
| T-EL84-TAD-MP - Matched Pair version | Body Height | 71 mm |
| Cathode to Heater Voltage | ≤ 100 V | |
| D.C. Cathode Current, AF Power Amplifier | 65 mA | |
| D.C. Plate Voltage, AF Power Amplifier | 420 V | |
| Grid 1 (control) Voltage, Af Power Amplifier | -100 V | |
| Grid 1 Control Voltage, Class A1 | -4.8 V | |
| Grid 1 to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance | < 10.8 pF | |
| Grid 1 to Plate Capacitance | < 0.5 pF | |
| Grid 2 Dc (screen) Dissipation, Af Power Amplifier | 2 W | |
| Grid 2 Dc (screen) Voltage, Af Power Amplifier | 300 V | |
| Grid 2 Screen Voltage, Class A1 | 250 V | |
| Heater Current | 0.76 A | |
| Heater Voltage | 5.8 V - 6.8 V, 6.3 V nominal | |
| Item Diameter | 22.5 mm | |
| Item Height | 77 mm | |
| Load Resistance, Class A1 | 5.2 kΩ | |
| Output Power (POut) @ 5% Distortion, Class A1 | 5.7 W | |
| Peak AF Grid 1 Control Voltage, Class A1 | 14 V | |
| Plate Dissipation, AF power amplifier (Wa) | 12 W | |
| Plate Voltage, class A1 (Ua) | 250 V | |
| Plate to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance | < 6.5 pF | |
| Signal Plate Current, Class A1, maximum | 80 mA | |
| Transconductance, Class A1 (S) | 9 mA/V | |
| Zero Signal Grid 2 Screen Current, Class A1 | 10.8 mA | |
| Zero Signal Plate Current, Class A1 | 49.5 mA | |
| T-EL84-TAD-MQ - Matched Quad version | Body Height | 71 mm |
| Cathode to Heater Voltage | ≤ 100 V | |
| D.C. Cathode Current, AF Power Amplifier | 65 mA | |
| D.C. Plate Voltage, AF Power Amplifier | 420 V | |
| Grid 1 (control) Voltage, Af Power Amplifier | -100 V | |
| Grid 1 Control Voltage, Class A1 | -4.8 V | |
| Grid 1 to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance | < 10.8 pF | |
| Grid 1 to Plate Capacitance | < 0.5 pF | |
| Grid 2 Dc (screen) Dissipation, Af Power Amplifier | 2 W | |
| Grid 2 Dc (screen) Voltage, Af Power Amplifier | 300 V | |
| Grid 2 Screen Voltage, Class A1 | 250 V | |
| Heater Current | 0.76 A | |
| Heater Voltage | 5.8 V - 6.8 V, 6.3 V nominal | |
| Item Diameter | 22.5 mm | |
| Item Height | 77 mm | |
| Load Resistance, Class A1 | 5.2 kΩ | |
| Output Power (POut) @ 5% Distortion, Class A1 | 5.7 W | |
| Peak AF Grid 1 Control Voltage, Class A1 | 14 V | |
| Plate Dissipation, AF power amplifier (Wa) | 12 W | |
| Plate Voltage, class A1 (Ua) | 250 V | |
| Plate to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance | < 6.5 pF | |
| Signal Plate Current, Class A1, maximum | 80 mA | |
| Transconductance, Class A1 (S) | 9 mA/V | |
| Zero Signal Grid 2 Screen Current, Class A1 | 10.8 mA | |
| Zero Signal Plate Current, Class A1 | 49.5 mA |
 Specification Sheet | All Models |
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Questions and Answers
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1 answers
Where is the tube made?
Asked by Anonymous on February 11th, 2019.
February 11th, 2019
Staff Member
These tubes are made in China, then sent to Germany for thorough testing.
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Product Reviews
Tested these against Sovteks and JJs in a hot-rodded marshall style amp and an amp with a plexi-style preamp. These have strong bass and great chime. Definitely a vintage feel to them. I personally wouldn't use these in a modern high gain style amp with EL84s, but I really like them for the vintage British sound. Would be great in Vox AC's or Marshall 18W's.
Tried this tube in a Vox AC4TV with a 10" WGS G10C speaker. All I can say is it sounds much more well rounded across the frequencies. Nothing harsh compared to the stock Sovtek that originally came in the amp or the JJ's and Tung Sol I've tried. I would say it has a richness that I didn't get with the other tubes mentioned. It's a real winner in my book and I'll continue to use TAD. Now I gotta look into their other offerings for the rest of my amps.
Still not sure if I prefer these to JJ in my Vox AC30HW2. I can say I am satisfied with Amplified Parts and their customer service. Good people.
Still not sure if I prefer these to JJ in my Vox AC30HW2. I can say I am satisfied with Amplified Parts and their customer service. Good people.
Popped these into a Blues Jr. Tweed. Very satisfying. Big, warm, girth you sound with plenty of cleans and "hair" around the edges, giving a crunchy bite. Unlike JJ's, these don't seem to be overplaying the wattage of the amp; a 15w sounds like a 15w, and I'm not blasting someone's eardrums during rehearsal. Well worth the price.
I put a set of these in a Soldano 20 watt head along with 3 12ax7's from Svetlana and let me tell you these TAD EL-84 tubes are the juice! They blow every other power tube away and I have tried them all. JJ's, Mullard's, Sovtek's, Ruby's, Tung-Sol's, and GT's, just to name a few. None of them come close to the sound of these TAD's! Powerful bass and nice mid's along with sparkling high that are not piercing or harsh. They also made the amp way louder than any other tube combination I have tried. They also have the most clean headroom and since I use a floor processor and some other pedals in my loop that was important to me. My amp now sounds awesome! I play out every week and this 20 watt head keeps up with the 60 watt Fender 4x10 Deville right next to me and the mega Ampeg bass amp from our bass player! We play '70's rock, blues and some country rock. We have a 5 piece band and we play loud. This amp and tube combo are superb! If have a chance to try these TAD tubes, by all means you need to give them a try. I am very pleased with them and I think yo will be too! Awesome choice I made and will never look back! Thanks!