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Pictured: Gold
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Vacuum Tube - 12AX7 / B759, Genalex Gold Lion
Genalex Gold Lion ECC83/B759 (12AX7) dual triode preamp tube with gold pins. Original Genalex Gold Lion ECC83/B759 tubes are considered among the best 12AX7 types ever made. They are hard to find and when they are available, they are expensive. They exhibit a large detailed soundstage that is sought after by discerning audiophiles who demand the highest quality sound. The reissue Genalex Gold Lion ECC83/B759 recreates the sound signature of the original. This tube features balanced sections and gold plated pins.
| Pin Type | Our Part Number | UPC/EAN |
|---|---|---|
| Regular | T-12AX7-GEN | |
| Gold | T-12AX7-GOLD-GEN | 841358101779 |
| Amplification Factor | 85 - 115 | |
| Capacitance, Cathode to Heater | 5.0 pF | |
| Capacitance, Plate to Plate | 0.6 pF | |
| Capacitance, input | 1.6 pF | |
| Capacitance, output | 0.46 pF | |
| Cathode to Heater Voltage | 200 V | |
| Grid Circuit Resistance (Rg), Automatic Bias | 2.2 MΩ | |
| Grid Circuit Resistance (Rg), Fixed Bias | 1.2 MΩ | |
| Grid Reverse Current | 0.2 μA | |
| Heater Current | 135 mA - 275 mA | |
| Heater Voltage | 6.0 - 6.6 V / 12.0 - 13.2 V | |
| Plate Current (Ia) | 9 mA | |
| Plate Dissipation, per triode (Wa) | 1.2 W | |
| Plate Voltage (Ua) | 330 V | |
| Structure-borne Noise | 3.5 mv | |
| Transconductance (S) | ≥ 1.4 mA/V |
| Packaging Dimensions | 2.75 in. × 1 in. × 1 in. | ||
| Weight (Packaging) | Gold version | T-12AX7-GOLD-GEN | 0.036 lbs. |
| Regular version | T-12AX7-GEN | 0.034 lbs. |
| T-12AX7-GEN - Regular version | Amplification Factor | 85 - 115 |
| Capacitance, Cathode to Heater | 5.0 pF | |
| Capacitance, Plate to Plate | 0.6 pF | |
| Capacitance, input | 1.6 pF | |
| Capacitance, output | 0.46 pF | |
| Cathode to Heater Voltage | 200 V | |
| Grid Circuit Resistance (Rg), Automatic Bias | 2.2 MΩ | |
| Grid Circuit Resistance (Rg), Fixed Bias | 1.2 MΩ | |
| Grid Reverse Current | 0.2 μA | |
| Heater Current | 135 mA - 275 mA | |
| Heater Voltage | 6.0 - 6.6 V / 12.0 - 13.2 V | |
| Plate Current (Ia) | 9 mA | |
| Plate Dissipation, per triode (Wa) | 1.2 W | |
| Plate Voltage (Ua) | 330 V | |
| Structure-borne Noise | 3.5 mv | |
| Transconductance (S) | ≥ 1.4 mA/V | |
| T-12AX7-GOLD-GEN - Gold version | Amplification Factor | 85 - 115 |
| Capacitance, Cathode to Heater | 5.0 pF | |
| Capacitance, Plate to Plate | 0.6 pF | |
| Capacitance, input | 1.6 pF | |
| Capacitance, output | 0.46 pF | |
| Cathode to Heater Voltage | 200 V | |
| Grid Circuit Resistance (Rg), Automatic Bias | 2.2 MΩ | |
| Grid Circuit Resistance (Rg), Fixed Bias | 1.2 MΩ | |
| Grid Reverse Current | 0.2 μA | |
| Heater Current | 135 mA - 275 mA | |
| Heater Voltage | 6.0 - 6.6 V / 12.0 - 13.2 V | |
| Plate Current (Ia) | 9 mA | |
| Plate Dissipation, per triode (Wa) | 1.2 W | |
| Plate Voltage (Ua) | 330 V | |
| Structure-borne Noise | 3.5 mv | |
| Transconductance (S) | ≥ 1.4 mA/V |
 Specification Sheet | All Models |
My Project Lists
Specifications, Files, and Documents
Questions and Answers
Click each question to see its answers.
2 answers
What is the difference between the gold pin one and the standard, is it ONLY the gold pins?
Asked by Anonymous on April 24th, 2020.
April 24th, 2020
Staff Member
Yes, that is the only difference.
The plates are longer in the gold version, as well as many other small differences. Please see the photos to compare.
1 answers
No problem putting this tube in a a Marshall AVT 150H?
Asked by Anonymous on October 6th, 2016.
Yes, this tube is comparable will all other 12AX7's and their variants.
1 answers
I need six of these matched for a preamplifier. Any chance you can give me a discount for so many?
Asked by Anonymous on October 7th, 2016.
These tubes do have balanced triodes but we can not match them to each other. You can call us directly at 480-820-5411 and we can get a quote for a bulk discount.
1 answers
Would this be a good swap for the stock 12Ax7 in my Bugera V5 infinium. Im also looking for a great power tube replacement.
Asked by Anonymous on April 13th, 2018.
This is a very high gain preamp tube and if that is what you are going for then this is an excellent choice.
1 answers
Hello, is this a good choice to put in my Orange tiny bass amp?
Asked by Anonymous on May 23rd, 2018.
If your amp calls for a 12AX7 and you are looking for a tube with a lot of gain then this would be an excellent choice. Check out our 12AX7 comparisons here: https://www.amplifiedparts.com/tech-corner/12ax7-comparison-current-made-tubes
1 answers
What tubes would you suggest for a fender blues deluxe?
Asked by Anonymous on June 5th, 2018.
June 8th, 2018
Staff Member
Tube choices are highly subjective and have many variables (What type of guitar being used, the genre of music, your personal playing habits, etc) so we encourage you to check out our comparisons of 12AX7s and 6L6 tubes.
https://www.amplifiedparts.com/tech-corner/12ax7-comparison-current-made-tubes
https://www.amplifiedparts.com/tech-corner/6l6gc-comparison-current-made-tubes
1 answers
would these be a good choice for a Mesa mpulse 600
Asked by Anonymous on August 21st, 2018.
August 22nd, 2018
Staff Member
Tube choices are highly subjective and have many variables (What type of guitar being used, the genre of music, your personal playing habits, etc) so we encourage you to check out our comparisons of 12AX7s and 6L6 tubes. https://www.amplifiedparts.com/tech-corner/12ax7-comparison-current-made-tubes
1 answers
I would like to use this tube in my Orange Micro Dark and in my Fender Champ 600. Is this a good choice for that application?
Asked by Anonymous on September 12th, 2018.
September 12th, 2018
Staff Member
Since both of your amps call for a 12AX7, it will certainly work. If you are looking for a tube that can produce a lot of gain then this would be an excellent choice. Check out our 12AX7 comparisons here: https://www.tubesandmore.com/tech-corner/12ax7-comparison-current-made-tubes
1 answers
Hello, I wonder if I can use these Genalex Gold Lion ECC83/B759 (12AX7) on my Saturn Signature – Class A Integrated Amplifier? email: f-holm@online.no
Asked by Anonymous on April 10th, 2019.
April 10th, 2019
Staff Member
If the Saturn Signature uses 12AX7 tubes, these will work as replacements.
1 answers
Fender Hot Rod Deluxe iii Hi, would I be ok by using a Vacuum Tube - 12AX7/B759, Genalex Gold Lion, Gold Pin x 1 in my first gain stage, I'm on a budget.
Please advise.
Asked by Anonymous on May 27th, 2019.
May 30th, 2019
Staff Member
This would certainly work in any preamp position on your amplifier. Please see the 12AX7 Comparison of Current Made Tubes chart for the tonal characteristics of this particular tube. https://www.amplifiedparts.com/tech-corner/12ax7-comparison-current-made-tubes
1 answers
Hello, I wonder if I can replace the TAD 12ax7 preamp tubes if my Laney Lionheart 5t112 with this tubes? Thanks!
Asked by Anonymous on August 4th, 2019.
August 6th, 2019
Staff Member
Yes, these can be used in place of any 12AX7 tube.
1 answers
hello! would these fit a c12 microphone ? are there microphonic noises ? thanks. luc
Asked by Anonymous on November 25th, 2019.
November 26th, 2019
Staff Member
This is a standard sized 12AX7 tube and will fit any 12AX7 position.
1 answers
What the best 12ax7 to use in the v6 phase invertor socket 100 watt , sf turned bf fender twin reverb with turned High Gain pexi for the normal channel, Thanks!
Asked by Anonymous on April 29th, 2020.
April 30th, 2020
Staff Member
The answer to that is subjective in nature and our picks may not be your favorite. With this in mind, we developed the 12AX7 Comparison of Current Made Tubes chart to help navigate the different options from the many available. https://www.amplifiedparts.com/tech-corner/12ax7-comparison-current-made-tubes
Product Reviews
I compared several 12AX7 tubes. I found this tube to be a bit too bright and with a bit too much drive. I preferred the Mullard CV4004. I thought the Mullard had better definition than the Gold Lion. I did not get gold pins. I was surprised to see that this tube is now made in China.
I compared several 12AX7 tubes. I found this tube to be a bit too bright and with a bit too much drive.I preferred the Mullard CV4004. I thought the Mullard had better definition than the Gold Lion.
I replaced the factory pair of 12ax7s in my Pro-ject Tube Box DS2 with a pair of these darlings. I'd been told the phonostage was not good enough to be worth tube rolling. BOLLOCKS.System is a Rega RP-8 with Apheta 3, into a Pro-ject Tube Box DS2. Then a Vincent sa-31 pre-amp into a Parasound A-23 solid state power amp. That drive a pair of B&W 706S2s.
The first few minutes these tubes were muddy and noisy. Within a album they had already gotten full and even. Within a day the sound was far beyond the previous set of tubes. I was able to lower the gain on my phonostage by 5dB, from 65 to 60, and still use less volume on my pre-amp and power amp to drive my speakers. This made quite a nice difference in dropping noise floor. As this is my first effort at tube rolling I'm surprised and very pleased with the out come.
I'm absolutely pleased with the $93 investment and the resultant improvements in my audio system..I also want to thank Amplified Parts for their tube comparison reviews. I used them to select what tubes to get. Using the low, mid and high ratings as well as the power output numbers to figure out what seemed like the best bet for the change I was wanting to get out of the exercise.
I like it. It has a bit of personality around the edges and a good amount of gain. Makes my strat sound stratty. I'm not audiophile enough to quantify it more than that and it all comes with a grain of salt.
I'm using it in a homemade Fender Champ type circuit with a 6L6 power tube. I like this tube better than the other preamp tubes I have tried in this amp : JJ (bright and brittle), EH (round and maybe dull - but I love them in my Vox) and Mullard (nice clean, not overly harmonic).
Note that the desc says Made in Russia, but the tube is stamped Made in China. This is the standard pin tube.
I just love these tubes !!!
These are some of the best tubes out there today.. The natural sustain that comes out of these tubes is unbelievable... I put these in my 100 watt Plexi and the sound is in a word AWESOME ! I ordered more for my 50 watt Plexi. They are pricy, But you get what you pay for. I will stock up on these tubes.