CED Tube Amp Doctor T EL84 RB TAD Vacuum Tube EL84 STR Redbase Tube Amp Doctor P15414610CED-T-EL84-RB-TAD-S https://cdnimages.opentip.com/full/CED/CED-T-EL84-RB-TAD.jpg Tube Amp Doctor T EL84 RB TAD Vacuum Tube EL84 STR Redbase Tube Amp Doctor Manufacturer Part Number: T-EL84-RB-TADThe 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 TestMicrophonic TestSonic TestsShock TestsListening TestsShorts & Leakage TestsMeasurements and SpecsApproximate net weight19 g (0.67 oz.) Basenoval, 9-pin CathodeOxide-coated, unipotential Cathode-to-heater potential, max.+100 V CoolingConvection Diameter22.5 mm (0.88\") Height77 mm (3.031\") Max. DC cathode current65 mA Max. DC plate voltage420 V Max. Grid no.1 (control) voltage-100 V Max. Grid no.2 DC (screen) dissipation2 W Max. Grid no.2 DC (screen) voltage300 V Max. HeaterCurrent0.76 A Max. Plate dissipation12 W Nom. Heater Voltage (AC or DC)6.3 V Operating PositionAny Seated height71 mm (2.795\") Typ. Grid 1 Control Voltage-4.8 V Typ. Grid 2 Screen Voltage250 V Typ. Load Resistance5200 Ohms Typ. Maximum Signal Plate Current80 mA Typ. Output Power at 9.5% distortion5.7 W Typ. Peak AF Grid 1 Control Voltage14 V Typ. Plate Voltage250 V Typ. Transconductance (nominal)9.000 mS Typ. Zero Signal Grid 2 Screen Current (avg)10.8 mA Typ. Zero Signal Plate Current49.5 mA Packaging InformationPackaging DimensionsMatched Pair versionT-EL84-RB-TAD-MP2.065 in. × 1.115 in. × 3.3 in. Matched Quad versionT-EL84-RB-TAD-MQ4.13 in. × 1.115 in. × 3.3 in. Single versionT-EL84-RB-TAD1.0325 in. × 1.115 in. × 3.3 in. Weight (Packaging)Matched Pair versionT-EL84-RB-TAD-MP0.0915 lbs. Matched Quad versionT-EL84-RB-TAD-MQ0.183 lbs. Single versionT-EL84-RB-TAD0.0458 lbs. 15414610 0.1000lbs 0.00 0.00 0.00

Tube Amp Doctor

33.28 2025-07-05 In Stock Tube Amp Doctor T EL84 RB TAD Vacuum Tube EL84 STR Redbase Tube Amp Doctor

Tube Amp Doctor T-EL84-RB-TAD Vacuum Tube - EL84-STR, Redbase, Tube Amp Doctor

Brand Tube Amp Doctor

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SKU: CED-T-EL84-RB-TAD

Price: $33.28

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MATCHED QUAD	- + $128.11
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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:

Plate Current (PC) and Amplification (TC)
Low Noise Test
Microphonic Test
Sonic Tests
Shock Tests
Listening Tests
Shorts & Leakage Tests

Measurements and Specs

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 Information

Packaging Dimensions

Matched Pair version

T-EL84-RB-TAD-MP

2.065 in. × 1.115 in. × 3.3 in.

Matched Quad version

T-EL84-RB-TAD-MQ

4.13 in. × 1.115 in. × 3.3 in.

Single version

T-EL84-RB-TAD

1.0325 in. × 1.115 in. × 3.3 in.

Weight (Packaging)

Matched Pair version

T-EL84-RB-TAD-MP

0.0915 lbs.

Matched Quad version

T-EL84-RB-TAD-MQ

0.183 lbs.

Single version

T-EL84-RB-TAD

0.0458 lbs.

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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