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Vacuum Tube - EL84, Tube Amp Doctor

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SKU:	T-EL84-TAD-X
Item ID:	004858

Starting at: $18^.45

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Type

Power

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

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

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Specifications, Files, and Documents

Specification Sheet

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Product Measurements by Type (click to expand)

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	1 in. × 2 in. × 3.3 in.
	Matched Quad version	1 in. × 4 in. × 3.3 in.
	Single version	3.25 in. × 1 in. × 1 in.
Weight (Packaging)	Matched Pair version	0.1 lbs.
	Matched Quad version	0.2 lbs.
	Single version	0.05 lbs.

Product Measurements by Item (click to expand)

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

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Product Reviews

4.77 out of 5 based on 13 reviews

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5 out of 5

Tubes sound great!

timrook1 - March 10th, 2020

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3 out of 5

Installed a matched pair of these TAD EL84-STR's in my Vox Night Train 15H and got a loud hum after taking the amp off standby, after a warm up for 3-4 minutes. Gain and volume all the way down, the amp is self biasing. The hum would disappear after 2-3 minutes. But this is occurring less though, the more the tubes are being broken in and used. These tubes break up a lot earlier than the Preferred Series 7189 I had in before. I have to dial back the gain a lot on my amp. It's an aggressive tube, with a wide fat tone. It's great for rock or crunch. Lots of bass and good midrange, but less headroom compared to what I had in before.

echodigger - August 4th, 2018

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5 out of 5

Excellent...! These TAD EL84 STRs add a 6V6 flavor muscle to the already *very* good EL84 sound. I'll definitely be staying with these - the best new production EL84s I've heard (hear that Ruby/JJs...?). If only TAD improved new production 12AX7s like this...!

Anonymous - October 14th, 2017

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5 out of 5

Anonymous - October 14th, 2017

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5 out of 5

I have been using these TAD EL84str power tubes for quite some time now and I have tried them all in my Soldano amp. These have the best of all worlds for lows, mids and highs. The bass response from my amp is absolutely fantastic. I play classic rock and blues guitar and these tubes really are the best I have ever found so far. Way better then Sovt, JJ, Mull, you name it I tried it. Been playing for 45 yrs, 63 and still rocking on the weekends. Love these tubes so much I don't have any others on hand anymore. Sold everything else I had. I might add I use Sylvania 12ax7's for the pre-amp tubes. Best I have found in 12ax7's. NOS Sylvania's with the green lettering.

Rockin' Ronnie - March 22nd, 2017

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4 out of 5

Application: Heathkit UA-2 amplifiers. These are competent tubes with no bad qualities that I could hear. Perhaps nearly the equal of the Sovtek tubes I generally use. As such, they're not worth the extra cost.

AES4589 - April 20th, 2016

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5 out of 5

The TAD EL 84 STRs have about 35 hours of play time on them and continue to improve. Best characteristic of the tube is the impression that my amp has additional power. These tubes are great!

Robert F Plattner - February 20th, 2016

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5 out of 5

Replace power tubes in Vox AC15C1X. Nice sounding tubes!

Steve Rawls - January 31st, 2016

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5 out of 5

Quick delivery. And it sure was nice getting a phone call to clarify what I was going to receive. The Tubes I was replacing were about twenty years old (EL84 TAD-str's)so bottle length was longer than the old tubes. A little tweaking of the hangers solved that problem. They're a little crisp sounding. I'm running them in class A so it shouldn't be long before the mellow out a bit. All and all I'd say a good re-tube for my '94 Laney VC30 112. Thank you.

Marc Harlow - December 31st, 2015

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5 out of 5

Marc Harlow - December 31st, 2015

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Questions and Answers

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Where is the tube made?1 answers

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Asked by Anonymous on February 10th, 2019.

Answers (1)

BradWbr

Staff Member

February 11th, 2019

These tubes are made in China, then sent to Germany for thorough testing.

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Are you currently shipping to Australia as I am interested in buying some tubes1 answers

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Asked by Anonymous on May 29th, 2020.

Answers (1)

BradWbr

Staff Member

June 1st, 2020

We are indeed shipping internationally, yes.

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