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Vacuum Tube - EL84, Tube Amp Doctor

Vacuum Tube - EL84, Tube Amp Doctor image 2

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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

SKU:

T-EL84-TAD-X

Item ID:

004858

Brand:

Tube Amp Doctor (TAD)

Type:

Power

Part Numbers
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

Measurements by Type
Measurements by Item

Product Measurements by Type
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 (P_Out) @ 5% Distortion, Class A1		5.7 W
Peak AF Grid 1 Control Voltage, Class A1		14 V
Plate Dissipation, AF power amplifier (W_a)		12 W
Plate Voltage, class A1 (U_a)		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 Information
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.

Product Measurements by Item
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 (P_Out) @ 5% Distortion, Class A1	5.7 W
	Peak AF Grid 1 Control Voltage, Class A1	14 V
	Plate Dissipation, AF power amplifier (W_a)	12 W
	Plate Voltage, class A1 (U_a)	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 (P_Out) @ 5% Distortion, Class A1	5.7 W
	Peak AF Grid 1 Control Voltage, Class A1	14 V
	Plate Dissipation, AF power amplifier (W_a)	12 W
	Plate Voltage, class A1 (U_a)	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 (P_Out) @ 5% Distortion, Class A1	5.7 W
	Peak AF Grid 1 Control Voltage, Class A1	14 V
	Plate Dissipation, AF power amplifier (W_a)	12 W
	Plate Voltage, class A1 (U_a)	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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Specification Sheet

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