Vacuum Tube - 12AX7 / ECC83, Electro-Harmonix
Pictured: Regular
Pictured: Regular
Pictured: Regular
Pictured: Gold
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Starting at: $28.40
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This Russian tube is full bodied and bright with a more straightforward presentation. It packs a lot of bite with its higher-than-normal gain. In overdrive, it offers a lot of crunchy fizz. High gain preamplifier tube with ultra low noise and detailed, musical tone. Unique spiral filament eliminates filament to cathode induced hum common on amplifiers that use AC on the filaments.
Superior high gain short plate format Twin Triode, with ultra-low noise and detailed, musical tone.
- Ultra-low noise thanks to unique spiral filament which eliminates cathode-to-filament induced hum on certain amps
- ECC83/7025 equivalent
For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.
Accessory Items:
| Pin Type | Our Part Number | UPC/EAN |
|---|---|---|
| Regular | T-12AX7EH | 683274020099 |
| Gold | T-12AX7-GOLD-EH | 841358101762 |
| Amplification Factor | 78 min, 92 nominal | |
| Capacitance, Cathode to Heater | 5.0 nF | |
| Capacitance, Grid to Cathode | 1.6 pF | |
| Capacitance, Grid to Heater | 1.6 pF | |
| Capacitance, Plate to Cathode | 0.44 pF / 0.36 pF | |
| Capacitance, Plate to Heater | 0.44 pF / 0.36 pF | |
| Capacitance, Plate to Plate | 520 pF | |
| Capacitance, grid to plate | 1.6 pF | |
| Grid Circuit Resistance (Rg), Fixed Bias | 1 MΩ | |
| Grid Circuit Resistance (Rg), Self Bias | 2.2 MΩ | |
| Grid Reverse Current | 0.2 μA | |
| Heater Voltage | 6.0 - 6.6 V / 12.0 - 13.2 V | |
| Heater to Cathode Voltage, Negative | 200 V | |
| Heater to Cathode Voltage, Positive | 100 V | |
| Plate Current (Ia) | 9 mA | |
| Plate Dissipation, per triode (Wa) | 1.0 W | |
| Plate Resistance (Ra) | 54.1 kΩ | |
| Plate Voltage (Ua) | 300 V | |
| Transconductance (S) | ≥ 1.4 mA/V, 1.7 mA/V nominal |
| Packaging Dimensions | Gold version | T-12AX7-GOLD-EH | 2.75 in. × 1 in. × 1 in. |
| Regular version | T-12AX7EH | 1.1 in. × 1.1 in. × 3.1 in. | |
| Weight (Packaging) | Gold version | T-12AX7-GOLD-EH | 0.0309 lbs. |
| Regular version | T-12AX7EH | 0.038 lbs. |
| T-12AX7-GOLD-EH - Gold version | Amplification Factor | 78 min, 92 nominal |
| Capacitance, Cathode to Heater | 5.0 nF | |
| Capacitance, Grid to Cathode | 1.6 pF | |
| Capacitance, Grid to Heater | 1.6 pF | |
| Capacitance, Plate to Cathode | 0.44 pF / 0.36 pF | |
| Capacitance, Plate to Heater | 0.44 pF / 0.36 pF | |
| Capacitance, Plate to Plate | 520 pF | |
| Capacitance, grid to plate | 1.6 pF | |
| Grid Circuit Resistance (Rg), Fixed Bias | 1 MΩ | |
| Grid Circuit Resistance (Rg), Self Bias | 2.2 MΩ | |
| Grid Reverse Current | 0.2 μA | |
| Heater Voltage | 6.0 - 6.6 V / 12.0 - 13.2 V | |
| Heater to Cathode Voltage, Negative | 200 V | |
| Heater to Cathode Voltage, Positive | 100 V | |
| Plate Current (Ia) | 9 mA | |
| Plate Dissipation, per triode (Wa) | 1.0 W | |
| Plate Resistance (Ra) | 54.1 kΩ | |
| Plate Voltage (Ua) | 300 V | |
| Transconductance (S) | ≥ 1.4 mA/V, 1.7 mA/V nominal | |
| T-12AX7EH - Regular version | Amplification Factor | 78 min, 92 nominal |
| Capacitance, Cathode to Heater | 5.0 nF | |
| Capacitance, Grid to Cathode | 1.6 pF | |
| Capacitance, Grid to Heater | 1.6 pF | |
| Capacitance, Plate to Cathode | 0.44 pF / 0.36 pF | |
| Capacitance, Plate to Heater | 0.44 pF / 0.36 pF | |
| Capacitance, Plate to Plate | 520 pF | |
| Capacitance, grid to plate | 1.6 pF | |
| Grid Circuit Resistance (Rg), Fixed Bias | 1 MΩ | |
| Grid Circuit Resistance (Rg), Self Bias | 2.2 MΩ | |
| Grid Reverse Current | 0.2 μA | |
| Heater Voltage | 6.0 - 6.6 V / 12.0 - 13.2 V | |
| Heater to Cathode Voltage, Negative | 200 V | |
| Heater to Cathode Voltage, Positive | 100 V | |
| Plate Current (Ia) | 9 mA | |
| Plate Dissipation, per triode (Wa) | 1.0 W | |
| Plate Resistance (Ra) | 54.1 kΩ | |
| Plate Voltage (Ua) | 300 V | |
| Transconductance (S) | ≥ 1.4 mA/V, 1.7 mA/V nominal |
 Specification Sheet | All Models |
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Questions and Answers
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1 answers
I have a crate gt80 non dsp amp. will this work in it?
Asked by Anonymous on June 20th, 2017.
June 20th, 2017
Staff Member
It looks like your amp takes one 12AX7 and two 12AU7's. This Electro-harmonix 12AX7 will work and you can find the 12AU7 on our site.
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Product Reviews
EH 12AX7 tubes are a great But what's even better is the customer service I received from tubes and more. With a good client's repair on the bench who is moving in a week I ordered 12AY7s accidentally. Emailed The guys at tubes and More explaining the situation the service was impeccable I received an RA number, the correct order was put in the system and shipped out immediately then the difference as well as the credit was processed in more than a timely manner. As a business owner this kind of customer service really stands out and makes a difference of who I'm going to order from in the future. Tubes and more is at the top of my list and I'm very pleased with The price and of course the service I received.
perfect!
4.5 star
These are great sounding, reasonable tubes!
Excellent service and products!
Used in V1 in my Reeves 225, sounds excellent & can be recommended.
Great price on a great product! Have always liked the Electro-Harmonix tubes and these sound exactly as described.
Replaced a standard 12AX7 with this tube to add a bit more gain in this 5 watt amp. Not a huge difference, but enough to notice.
Good Solid Tubes
Nice Tone
For a Fender Deluxe Reverb, Out of a full set of Electro Harmonix tubes, just pulled out the last bad one. Out of 5 tubes, 2 12AT7's and 3 12AX7's, every single one was bad. The first shot, 2 extremely microphonic 12AX7's, since they were in the return period, AES sent replacements. The 12AT7 reverb driver blew out last week (probably less than 25 hours runtime), replaced that, then this week one side of the phase inverter dropped gain suddenly. Since they are now out of warranty, I had to replace 3 bad tubes out of pocket. Until Electro Harmonix fixes their quality problems, I would not recommend their 12AX7's or 12AT7's.