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Tube Amp Doctor T-EL84-RB-TAD EL84-STR, Redbase, Tube Amp Doctor, Matched Vacuum Tube
Brand Tube Amp Doctor
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Product Description
Manufacturer Part Number: T-EL84-RB-TAD
The all new TAD-EL84-STR Redbase brings together the best of both - the famous EL84-Cz and the EL84M. We 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 especially with regard to its linearity over the entire frequency range. Finally we 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.
Note: Due to its diameter of 22.5mm, the TAD EL84-STR does not fit into older Marshall DSL401 made till week #20 in 2014 and the UK made VOX AC15 TBX amplifiers from the same time period. Later versions of these amplifiers have been updated to accept 22.5mm diameter tubes with no problem.
Q: When does a power tube become a Premium Selected power tube?
A: All power tubes labeled Premium Selected have passed the following tests:
The all new TAD-EL84-STR Redbase brings together the best of both - the famous EL84-Cz and the EL84M. We 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 especially with regard to its linearity over the entire frequency range. Finally we 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.
Note: Due to its diameter of 22.5mm, the TAD EL84-STR does not fit into older Marshall DSL401 made till week #20 in 2014 and the UK made VOX AC15 TBX amplifiers from the same time period. Later versions of these amplifiers have been updated to accept 22.5mm diameter tubes with no problem.
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
| Approximate net weight | 19 g (0.67 oz.) |
| Base | noval, 9-pin |
| Cathode | Oxide-coated, unipotential |
| Cathode-to-heater potential, max. | +100 V |
| Cooling | Convection |
| Diameter | 22.5 mm (0.88") |
| Height | 77 mm (3.031") |
| Max. DC cathode current | 65 mA |
| Max. DC plate voltage | 420 V |
| Max. Grid no.1 (control) voltage | -100 V |
| Max. Grid no.2 DC (screen) dissipation | 2 W |
| Max. Grid no.2 DC (screen) voltage | 300 V |
| Max. HeaterCurrent | 0.76 A |
| Max. Plate dissipation | 12 W |
| Nom. Heater Voltage (AC or DC) | 6.3 V |
| Operating Position | Any |
| Seated height | 71 mm (2.795") |
| Typ. Grid 1 Control Voltage | -4.8 V |
| Typ. Grid 2 Screen Voltage | 250 V |
| Typ. Load Resistance | 5200 Ohms |
| Typ. Maximum Signal Plate Current | 80 mA |
| Typ. Output Power at 9.5% distortion | 5.7 W |
| Typ. Peak AF Grid 1 Control Voltage | 14 V |
| Typ. Plate Voltage | 250 V |
| Typ. Transconductance (nominal) | 9.000 mS |
| Typ. Zero Signal Grid 2 Screen Current (avg) | 10.8 mA |
| Typ. Zero Signal Plate Current | 49.5 mA |
| Packaging Dimensions | Matched Pair version | T-EL84-RB-TAD-MP | 2.065 in. X 1.115 in. X 3.3 in. |
| Matched Quad version | T-EL84-RB-TAD-MQ | 4.13 in. X 1.115 in. X 3.3 in. | |
| Single version | T-EL84-RB-TAD | 1.0325 in. X 1.115 in. X 3.3 in. | |
| Weight (Packaging) | Matched Pair version | T-EL84-RB-TAD-MP | 0.388 lbs. |
| Matched Quad version | T-EL84-RB-TAD-MQ | 0.776 lbs. | |
| Single version | T-EL84-RB-TAD | 0.194 lbs. |
| T-EL84-RB-TAD-MP - Matched Pair version | Approximate net weight | 19 g (0.67 oz.) |
| Base | noval, 9-pin | |
| Cathode-to-heater potential, max. | +100 V | |
| Cathode | Oxide-coated, unipotential | |
| Cooling | Convection | |
| Diameter | 22.5 mm (0.88") | |
| Height | 77 mm (3.031") | |
| Max. DC cathode current | 65 mA | |
| Max. DC plate voltage | 420 V | |
| Max. Grid no.1 (control) voltage | -100 V | |
| Max. Grid no.2 DC (screen) dissipation | 2 W | |
| Max. Grid no.2 DC (screen) voltage | 300 V | |
| Max. HeaterCurrent | 0.76 A | |
| Max. Plate dissipation | 12 W | |
| Nom. Heater Voltage (AC or DC) | 6.3 V | |
| Operating Position | Any | |
| Seated height | 71 mm (2.795") | |
| Typ. Grid 1 Control Voltage | -4.8 V | |
| Typ. Grid 2 Screen Voltage | 250 V | |
| Typ. Load Resistance | 5200 Ohms | |
| Typ. Maximum Signal Plate Current | 80 mA | |
| Typ. Output Power at 9.5% distortion | 5.7 W | |
| Typ. Peak AF Grid 1 Control Voltage | 14 V | |
| Typ. Plate Voltage | 250 V | |
| Typ. Transconductance (nominal) | 9.000 mS | |
| Typ. Zero Signal Grid 2 Screen Current (avg) | 10.8 mA | |
| Typ. Zero Signal Plate Current | 49.5 mA | |
| T-EL84-RB-TAD-MQ - Matched Quad version | Approximate net weight | 19 g (0.67 oz.) |
| Base | noval, 9-pin | |
| Cathode-to-heater potential, max. | +100 V | |
| Cathode | Oxide-coated, unipotential | |
| Cooling | Convection | |
| Diameter | 22.5 mm (0.88") | |
| Height | 77 mm (3.031") | |
| Max. DC cathode current | 65 mA | |
| Max. DC plate voltage | 420 V | |
| Max. Grid no.1 (control) voltage | -100 V | |
| Max. Grid no.2 DC (screen) dissipation | 2 W | |
| Max. Grid no.2 DC (screen) voltage | 300 V | |
| Max. HeaterCurrent | 0.76 A | |
| Max. Plate dissipation | 12 W | |
| Nom. Heater Voltage (AC or DC) | 6.3 V | |
| Operating Position | Any | |
| Seated height | 71 mm (2.795") | |
| Typ. Grid 1 Control Voltage | -4.8 V | |
| Typ. Grid 2 Screen Voltage | 250 V | |
| Typ. Load Resistance | 5200 Ohms | |
| Typ. Maximum Signal Plate Current | 80 mA | |
| Typ. Output Power at 9.5% distortion | 5.7 W | |
| Typ. Peak AF Grid 1 Control Voltage | 14 V | |
| Typ. Plate Voltage | 250 V | |
| Typ. Transconductance (nominal) | 9.000 mS | |
| Typ. Zero Signal Grid 2 Screen Current (avg) | 10.8 mA | |
| Typ. Zero Signal Plate Current | 49.5 mA | |
| T-EL84-RB-TAD - Single version | Approximate net weight | 19 g (0.67 oz.) |
| Base | noval, 9-pin | |
| Cathode-to-heater potential, max. | +100 V | |
| Cathode | Oxide-coated, unipotential | |
| Cooling | Convection | |
| Diameter | 22.5 mm (0.88") | |
| Height | 77 mm (3.031") | |
| Max. DC cathode current | 65 mA | |
| Max. DC plate voltage | 420 V | |
| Max. Grid no.1 (control) voltage | -100 V | |
| Max. Grid no.2 DC (screen) dissipation | 2 W | |
| Max. Grid no.2 DC (screen) voltage | 300 V | |
| Max. HeaterCurrent | 0.76 A | |
| Max. Plate dissipation | 12 W | |
| Nom. Heater Voltage (AC or DC) | 6.3 V | |
| Operating Position | Any | |
| Seated height | 71 mm (2.795") | |
| Typ. Grid 1 Control Voltage | -4.8 V | |
| Typ. Grid 2 Screen Voltage | 250 V | |
| Typ. Load Resistance | 5200 Ohms | |
| Typ. Maximum Signal Plate Current | 80 mA | |
| Typ. Output Power at 9.5% distortion | 5.7 W | |
| Typ. Peak AF Grid 1 Control Voltage | 14 V | |
| Typ. Plate Voltage | 250 V | |
| Typ. Transconductance (nominal) | 9.000 mS | |
| Typ. Zero Signal Grid 2 Screen Current (avg) | 10.8 mA | |
| Typ. Zero Signal Plate Current | 49.5 mA |
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
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