Vacuum Tube - EL34B, Tube Amp Doctor

Tube Amp Doctor (TAD)
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Vacuum Tube - EL34B, Tube Amp Doctor

Starting at: $23.45
In stock

Octal power tube (Max Plate Watts = 25W)

Sensational new high-gain EL34 tube with a very dynamic tone. An authentic remake of the British Mullard EL34. The clear and harmonic open top end allows for great clean tone and at the same time the TAD EL34B-STR offers incredibly powerful mids and equally powerful bass. The golden control grid and especially large cooling grids guarantee maximum stability and reliability. Consequently, this EL34 provides a maximum of gain and dynamic response.

Can replace any 6CA7 or KT77.

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

RoHS Compliant
Item ID:
Tube Amp Doctor (TAD)
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Matched PairT-EL34B-TAD-MP609722123426
Matched QuadT-EL34B-TAD-MQ609722123433
Product Measurements
Body Height101 mm
Cathode to Heater Voltage≤ 100 V
D.C. Cathode Current, AF Power Amplifier150 mA
D.C. Plate Voltage, AF Power Amplifier800 V
Grid 1 (control) Voltage, Af Power Amplifier-300 V
Grid 1 Control Voltage, Class A1-13.5 V
Grid 1 to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance< 15.2 pF
Grid 1 to Plate Capacitance< 1.1 pF
Grid 2 Dc (screen) Dissipation, Af Power Amplifier8 W
Grid 2 Dc (screen) Voltage, Af Power Amplifier500 V
Grid 2 Screen Voltage, Class A1250 V
Heater Current1.5 A
Heater Voltage5.8 V - 6.8 V, 6.3 V nominal
Item Diameter36 mm
Item Height114 mm
Load Resistance, Class A12 kΩ
Output Power (POut) @ 5% Distortion, Class A111 W
Peak AF Grid 1 Control Voltage, Class A18.7 V
Plate Dissipation, AF power amplifier (Wa)25 W
Plate Voltage, class A1 (Ua)264 V
Plate to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance< 8.5 pF
Signal Plate Current, Class A1, maximum100 mA
Transconductance, Class A1 (S)11.5 mA/V
Zero Signal Grid 2 Screen Current, Class A114.9 mA
Zero Signal Plate Current, Class A170 mA
Packaging Information
Packaging DimensionsMatched Pair version2 in. × 4 in. × 4.6 in.
Matched Quad version2 in. × 8 in. × 4.6 in.
Single version2 in. × 2 in. × 4.6 in.
Weight (Packaging)Matched Pair version0.4 lbs.
Matched Quad version0.8 lbs.
Single version0.2 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet502.6 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on February 15th, 2017.
Matt H
February 15th, 2017
These will function just like any other EL34. The TAD's are slightly fuller sounding compared to the EHX tubes. Both are great and you can not go wrong with either of these tubes.
Asked by Anonymous on March 15th, 2017.
Matt H
March 15th, 2017
If the Dynaco calls for EL34 tubes then these should work.
Asked by Anonymous on September 19th, 2017.
Matt H
September 20th, 2017
You will want to request "middle numbers" when ordering tubes for Mesa Boogie amps. This can be done in the notes section of the checkout process or by placing a phone order.
Asked by Anonymous on August 13th, 2018.
August 13th, 2018
Staff Member
If your amp calls for EL34 tubes and has proper clearance, these will work in your amp.

Product Reviews

5.00 out of 5 based on 3 reviews


- March 28th, 2020
5 out of 5

Got a great deal on these amazing TADs. They really turned my Marshall JMD100 head into full toned clean and monster gained Beast!
This is my first Marshall. And I liked the idea of the variety of amp tones that it had to offer. I got the Marshall head used and wasn't too impressed the tones or gains. So as in the past of buying used tube amps the first thing i thought of was to replace the tubes.
I had purchased TAD preamp tubes but not power tubes. And I loved the preamp tubes.
So glad i got these. When I first powered it up with the TADs? WOW! And I'm still saying it.
Thanks to Amplified Parts for the deal and fast shipping.

- November 23rd, 2019
5 out of 5

Use these in my Friedman Runt 50.. sounds juicy.

- August 22nd, 2018
5 out of 5

Awesome tubes!!!! Been using JJ Tesla EL34 and 12AX7 for years. My amp repairman said he likes Tube Amp Dr so I thought I would try a set for a Traynor YCS50. These tubes improved the sound of both clean and overdrive channel substantially. Very dynamic tubes. Recommend for both preamp and power amp tube replacement.

- February 8th, 2013
5 out of 5

just installed these tubes in my Marshall jcm2000 DSL 100 and so far they sound great
very clear sounding even on the crunch channel

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