Vacuum Tube - 7025, Tube Amp Doctor, High Grade

Tube Amp Doctor (TAD)
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Vacuum Tube - 7025, Tube Amp Doctor, High Grade

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Warm, clean tone with creamy overdrive!

PREMIUM selected quality for the most demanding amp stages. This tube works greatly for warm clean tones and creamy overdrive. We recommend this tube for the 1st gain stage and as input tube. It upgrades 12AX7A and ECC83 tubes and replaces E83CC tubes.

The HIGHGRADE Selection is the tip-of-the-top quality at the lowest noise (microphony, hum, hiss) level. Typically only 0.5-2% out of the whole production of this tube meet the HIGHGRADE requirements.

The TAD 7025 Highgrade can replace any ECC83, E83CC, 12AX7, 12AX7A, 12AX7M, 12AX7WA/WB/WC/LPS/EH, 5751 or 7025.

Q: When does a preamp tube become a Premium Selected tube?

A: All preamp tubes labeled Premium Selected have passed the following tests:
- Low Noise Test
- Microphonic Test
- Gain Test
- Sonic Tests
- Shock Tests
- Listening Tests
- Balanced Output Test

Item ID:
Tube Amp Doctor Part Number:
Tube Amp Doctor (TAD)
RoHS Compliant
Product Measurements by Type
Body Height59 mm
Bulb Temperature160°C
Cathode Current (Ik)8 mA
Cathode to Heater Voltage≤ 150 V
D.C. Grid Voltage, negative-55 V
D.C. Grid Voltage, positive0 V
D.C. Plate Voltage330 V
Grid to Cathode Capacitance (cg/k)1.7 pF
Grid to Heater Capacitance (cg/h)0.2 pF
Grid to Plate Capacitance (ca/g)1.5 pF
Heater Current0.15 / 0.3 A
Heater Voltage6.3 / 12.6 V
Item Diameter22.5 mm
Item Height56 mm
Plate Dissipation (Wa)1.2 W
Plate to Cathode Capacitance0.3 pF
Packaging Information
Packaging Dimensions3.25 in. × 1 in. × 1 in.
Weight (Packaging)0.038 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet264.36 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on January 31st, 2020.
February 4th, 2020
Staff Member
In addition to some tonal differences, specified in the description of each tube, the 7025WA has a shiny plate, while the standard 7025 has a normal grey plate.

Product Reviews

4.80 out of 5 based on 5 reviews
- March 31st, 2021
5 out of 5

Amazing for the first stage of any preamp, cut noise, and I got a more defined signal feed into the rest of the preamp tubes. Recommended.

- March 27th, 2020
4 out of 5

i put them in the V1 and V3 position in my '65 Deluxe Reverb Reissue. Contrary to what was claimed, they were not quieter and so i replaced them with some moderately old TAD 12AX7s, which I preferred and then got a set of Genalex Gold Lion 12Ax7s and put those in - which so far seem the best.

- January 3rd, 2020
5 out of 5

Excellent tube , I'm using it in a Marshall AVT 150 , which is not known for impressive overdrive , but with this tube it greatly improves the clean and overdrive channels , also if you put a tube screamer in front of the amp , you get very satisfying overdrive on low or increased gain . and of course the AVT 150 will crank out 150 watts ,
This is my new go to tube for the Marshall AVT 150H , it takes the place of a regular 12AX7.

- October 5th, 2019
5 out of 5

The hand selected low noise 7025 is worth every extra penny. This is all that I purchase for my customer's preamp stages.

- April 1st, 2019
5 out of 5

These 7025’s offer the best balance of break-up and headroom. They can get aggressive if pushed or clean up if dialed back. Best tubes I’ve ever played.