Vacuum Tube - 12AX7S, JJ Electronics, Mid Gain

Vacuum Tube - 12AX7S, JJ Electronics, Mid Gain

JJ Electronics
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The JJ Electronic ECC83MG / 12AX7MG is a new take on the classic 12AX7 preamp tube. While it uses the same rugged build and thick glass as other JJ preamp tubes, this tube differs in construction from the typical 12AX7 in that it features a medium-long plate. The JJ 12AXMG has a dynamic and open sound with a rich forward sounding mid range. This tube offers low noise and low microphonics.

Item ID:
JJ Electronics Part Number:
JJ Electronics
RoHS Compliant
Product Measurements by Type
Body Height49.2 mm
Cathode Current (Ik)≤ 8 mA
Filament Current (If)300 / 150 mA
Filament Voltage (Uf)6.3 / 12.6 V
Gain (μ)100
Grid Circuit Resistance (Rg)2.2 MΩ
Grid Voltage (Ug)≥ -50 V, -2 V typical
Heater to cathode resistance (Rk/f)150 kΩ
Heater to cathode voltage (Uk/f)≤ 180 V
Internal Resistance (Ri)62.5 kΩ
Item Diameter22 mm
Item Height56.3 mm
Plate Current (Ia)1.2 mA
Plate Dissipation (Wa)≤ 1 W
Plate Voltage (Ua)≤ 300 V, 250 V typical
Transconductance (S)1.6 mA/V
Packaging Information
Packaging Dimensions1 in. × 1 in. × 2.5 in.
Weight (Packaging)0.03 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet467.68 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on May 25th, 2017.
Matt H.
May 25th, 2017
Staff Member
This tube has a 5.7 relative 12AX7 voltage gain rating (scale of 1 to 10) when compared to the rest of the tubes in our 12AX7 comparison. For further info please refer to our tech corner article comparing 12AX7 tubes and the spec sheets included on this page.
Asked by Anonymous on May 25th, 2017.
Matt H.
May 25th, 2017
Staff Member
Yes, these will have less gain as compared to a standard 12AX7.
Asked by Anonymous on November 19th, 2021.
November 19th, 2021
Staff Member
Because preamp tubes (triodes) are functionally three tubes in one, they are unable to be matched in the same way power tubes are.

Product Reviews

4.33 out of 5 based on 6 reviews
John Kennedy - March 30th, 2020
5 out of 5

I've always had good luck with all the JJ Electronics vacuum tubes. AES always has good service and their prices are some of the best I've found anywhere and they have such a broad range of products especially for tube related projects. Recommended! - September 20th, 2019
5 out of 5

These are a great 12ax7 make your guitar amplifier more bluesy sounding. Jj tubes are also very affordable

carmen marranco - September 10th, 2018
5 out of 5

I was glad to replace the existing 12ax7's in my T25-Laredo amp.
It is producing nice clean sounds now.

Frank Karpienski - April 2nd, 2016
1 out of 5

It was not your fault and too much trouble to send it back,but it had a regular 12ax7S in the box not a 12ax7s-mg.It was probably a factory mistake.

Allen Gordon - May 16th, 2015
5 out of 5

This tube in V1 of a client's Fender Blues Junior really livened the tone a bit. It went from a generic-Fender-ISH tone to an articulate tube tone!

It doesn't necessarily add more gain, it simply focuses the gain to the lower-mid-range frequencies allowing lead tones to cut through the mix while still maintain full-range.

Nothing better than a good-sounding low-wattage amp being mic'd to a proper level! And these help paint a good picture!!!

Yasuhiro Tokuda - September 28th, 2014
5 out of 5

When tuning the sound of guitar amplifier, I've been struggling to choose the tube type for reverb mixer position whether ECC803 or ECC83S. ECC803 is higher gain and too much, ECC83S is low gain some time too gentle. Now got MG. Medium gain works just fine. I am very happy to have met this one.