Vacuum Tube - 12AX7S, JJ Electronics, Mid Gain
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.
SKU:
T-12AX7S-MG-JJ
Item ID:
010214
UPC/EAN:
609722166515
JJ Electronics Part Number:
ECC83MG / 12AX7MG
Brand:
JJ Electronics
Type:
RoHS Compliant
Accessory Items:
| Body Height | 49.2 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 Diameter | 22 mm | |
| Item Height | 56.3 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 Dimensions | 1 in. × 1 in. × 2.5 in. | |
| Weight (Packaging) | 0.03 lbs. |
 Specification Sheet | All Models |
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Specifications, Files, and Documents
Questions and Answers
Click each question to see its answers.
1 answers
What is the approximate gain factor of a Mid Gain JJ?
Asked by Anonymous on May 25th, 2017.
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.
1 answers
SO THESE HAVE LESS GAIN RIGHT?
Asked by Anonymous on May 25th, 2017.
May 25th, 2017
Staff Member
Yes, these will have less gain as compared to a standard 12AX7.
1 answers
can the JJ 12ax7 and 12AU7 tubes be ordered in matched pairs?
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
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!
These are a great 12ax7 make your guitar amplifier more bluesy sounding. Jj tubes are also very affordable
I was glad to replace the existing 12ax7's in my T25-Laredo amp.
It is producing nice clean sounds now.
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.
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!!!
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.