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.
JJ Electronics Part Number:
ECC83MG / 12AX7MG
|Body Height||49.2 mm|
|Cathode Current (Ik)||≤ 8 mA|
|Filament Current (If)||300 / 150 mA|
|Filament Voltage (Uf)||6.3 / 12.6 V|
|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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Questions and Answers
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2 answers HI if own a 5150 ll. would i follow the 5150 set or 6505? Thanks! Jiak
Asked by Anonymous on February 6th, 2020.
You will need to confirm that your amp uses a matched quad (x4) of 6L6 tubes and six (x6) 12AX7s, but if that is the case, the tube set for the 6505+ Plus includes the previously listed tubes with the correct quantities.
1 answers What is the approximate gain factor of a Mid Gain JJ?
Asked by Anonymous on September 16th, 2015.
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 mikill71 on May 25th, 2017.
Bought this as part of a kit for my '76 Fender Vibro Champ. Fits, works beautifully, and solved a problem with the speed and level settings of the built in tremolo. Also, the tube kit arrived before the estimated delivery, allowing me to use my amp in a gig I was going to have to borrow gear for.
Retubed a Fender Super Champ XD and it sounds great! Had a few questions and received good advice plus insightful info from the staff at Amplified Parts. When in doubt, call then and have your expectations exceeded. Thanks!
Sounds great in the amp
Amplified Parts was very helpful for me to repair my amp. I replaced most of the capacitors and some resistors, and replaced a few tubes. They sent out my order in a timely fashion, they have a good selection of parts and components. I repaired a 1977 Ampeg VT-22 , and now the amp is working great. Thank You Amplified Parts!
I will not buy any Russian Pre-Amp tubes because they
don't last. They sound great when their new, but quickly degrade in
sound, and I have a tube tester to verify the quality
Having said that, JJ Pre-Amp tubes have been extremely
reliable and test strong on my tube tester after over
a years use.
The standard JJ 12AX7 pre-amp tubes sound a bit
aggressive in the midrange and top end, so I decided
to give the 12AX7S-MG's a try.
I completely noticed a difference in a more
balanced, fuller Mid and Top end sound.
I would definitely recommend the 12AX7S-MG's. You
could probably get some great results using these in
the V1 and V2 socket and use standard JJ 12ax7's for the rest
of the Pre-Amp sockets.
If you like JJ pre-amp tubes for their reliability but feel like their a bit aggresive,
try these out!
These will give you some positive options.