Vacuum Tube - 12AX7A-C / ECC83, Tube Amp Doctor, Premium Selected

Vacuum Tube - 12AX7A-C / ECC83, Tube Amp Doctor, Premium Selected

Tube Amp Doctor (TAD)
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In Stock

9 pin miniature preamp tube (Amplification Factor =100).

Perfect V2+ Preamp Tube - Good Gain - Tight Deep Bass - Fat Mid-range!!

Very good gain, tight deep bass, fat mids and silky top end with overall definition and brightness. Selected with balanced systems and recommended for guitar amps to improve overall response.

Best for clean tones as well as for sounds requiring deep-bass power like any modern preamp. Recommended for all positions in amps with medium gain level or High-Gain Amps for V2+ positions.

The TAD 12AX7A-C can replace any 7025, 12AX7WA, 12AX7WB, 12AX7LPS, 12AX7EH, ECC83 or E83CC.

1st choice for:
Boogie®, Brunetti®, Diezel® , Engl®, Fender®, Hughes & Kettner®, Koch®, Laney®, Marshall®, Soldano®, Trace Elliot® and so many more.

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 Height49 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 Dimensions1 in. × 1 in. × 3.25 in.
Weight (Packaging)0.037 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet251.01 KB

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Product Reviews

5.00 out of 5 based on 8 reviews
- September 25th, 2021
5 out of 5

TAD tubes have a good reputation and it's well deserved with my personal experience. These were recommended by Lee Jackson, the designer of my amp, and they sound great. Lively, articulate, a little bright for my taste (but not brittle) but nothing that can't easily be dialed out. Better to have a little too much than not enough. Brings out a lot of sparkle with single coils.

- July 22nd, 2021
5 out of 5

Very good 12AX7 type tube. I have a quite rare combo amp and the designer (Lee Jackson) recommended TAD tubes. I'm NOT disappointed, the tubes are quiet and musical, reminds how a great tube amp should should sing and scream. As always, AES is at the top of their game with quick and careful shipping.

- March 1st, 2021
5 out of 5

It does sound good in the v2 of my Studio JCM800 combo its less bright some over the Ruby Chinese 12ax7 with more a little more thicker low end creamy goodness.

- February 9th, 2021
5 out of 5

I am really liking this tube in my Marshall JVM 215C in the V2 position paired with a Genalex Gold Lion in V1. Sweet and Rich.

- December 30th, 2019
5 out of 5

Replaced the 12AX7 Sovtek that came in the preamp of my bass amp - it was bad from the start. TAD sounds great!

- February 29th, 2016
5 out of 5

Really crisp mids and highs, a very good sounding 12AX7!

- January 31st, 2016
5 out of 5

Replaced preamp tubes in Vox AC15C1. Quality construction, great sound.

- April 19th, 2015
5 out of 5

For the preamp slot.