Pictured: Regular
Pictured: Gold
Pictured: Regular
Pictured: Gold
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Vacuum Tube - 12AT7 / ECC81, JJ Electronics
The JJ Electronic 12AT7 / ECC81 is a good choice for phase inverters, reverb drivers, and general preamp use. This tube offers low noise, low microphonics, and warm smooth tones at a great price. Like all JJ tubes, it has a rugged construction that doesn’t compromise the sound of your amp. The JJ 12AT7 is a solid replacement for any 12AT7, ECC81, or 6201 tube. It can also be used to replace 12AX7 tubes in position 1 to reduce gain.
RoHS Compliant
Accessory Items:
| Pin Type | Our Part Number | UPC/EAN | JJ Electronics Part Number |
|---|---|---|---|
| Gold | T-12AT7-GOLD-JJ | 609722123471 | ECC81 / 12AT7 - GOLD |
| Regular | T-12AT7-JJ | 844632064036 | ECC81 - 12AT7 |
| Body Height | 49.2 mm | ||
| Cathode Current (Ik) | ≤ 15 mA | ||
| Filament Current (If) | 300 / 150 mA | ||
| Filament Voltage (Uf) | 6.3 / 12.6 V | ||
| Gain (μ) | 60 | ||
| Grid Circuit Resistance (Rg) | 1 MΩ | ||
| Grid Voltage (Ug) | ≥ -50 V, -2 V typical | ||
| Heater to cathode voltage (Uk/f) | ≤ 90 V | ||
| Internal Resistance (Ri) | 11 kΩ | ||
| Item Diameter | 22 mm | ||
| Item Height | 56.3 mm | ||
| Plate Current (Ia) | 10 mA | ||
| Plate Dissipation (Wa) | ≤ 2.5 W | ||
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | ||
| Transconductance (S) | 5.5 mA/V | ||
| Packaging Dimensions | 1 in. × 1 in. × 2.5 in. | ||
| Weight (Packaging) | Gold version | T-12AT7-GOLD-JJ | 0.0265 lbs. |
| Regular version | T-12AT7-JJ | 0.03 lbs. | |
| T-12AT7-JJ - Regular version | Body Height | 49.2 mm |
| Cathode Current (Ik) | ≤ 15 mA | |
| Filament Current (If) | 300 / 150 mA | |
| Filament Voltage (Uf) | 6.3 / 12.6 V | |
| Gain (μ) | 60 | |
| Grid Circuit Resistance (Rg) | 1 MΩ | |
| Grid Voltage (Ug) | ≥ -50 V, -2 V typical | |
| Heater to cathode voltage (Uk/f) | ≤ 90 V | |
| Internal Resistance (Ri) | 11 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 56.3 mm | |
| Plate Current (Ia) | 10 mA | |
| Plate Dissipation (Wa) | ≤ 2.5 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 5.5 mA/V | |
| T-12AT7-GOLD-JJ - Gold version | Body Height | 49.2 mm |
| Cathode Current (Ik) | ≤ 15 mA | |
| Filament Current (If) | 300 / 150 mA | |
| Filament Voltage (Uf) | 6.3 / 12.6 V | |
| Gain (μ) | 60 | |
| Grid Circuit Resistance (Rg) | 1 MΩ | |
| Grid Voltage (Ug) | ≥ -50 V, -2 V typical | |
| Heater to cathode voltage (Uk/f) | ≤ 90 V | |
| Internal Resistance (Ri) | 11 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 56.3 mm | |
| Plate Current (Ia) | 10 mA | |
| Plate Dissipation (Wa) | ≤ 2.5 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 5.5 mA/V |
 Specification Sheet for Regular | T-12AT7-JJ |
| Specification Sheet for Gold | T-12AT7-GOLD-JJ |
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Questions? Contact us at [email protected], or give us a call at 480-296-0890
Substitute Products
The following items can be substituted for this product. While not necessarily exactly the same, they will function as replacement items in your project.
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Product Reviews
Sound great. Retubed my Reverb tank with tubes from here. Shipped fast and were carefully packed. Thank you
It works and does what it should. Quick shipping and careful packaging makes me a happy customer!
JJ Electronics has for many years been the go to choice for reliable tubes. We replaced the preamp tubes of a 1965 Fender Bassman and the amp really woke up! It's a beast of an amp and deserved a beast of a tube!
I bought a used Fender Hot Rod Deluxe and decided to swap out all the stock tubes for JJs. To my ears, the JJs are a bit warmer than the stock Fender tubes which come in the amp. I put this tube (12AT7) in the first stage in order to decrease the overall volume. Doing so offers considerably more control over volume. After installing the tube and using the amp, I noticed that the volume "spike" between 1-2 on the main volume (going from no sound to ear shattering loud) was gone. The volume increase is now smooth and steady. Amplified Parts have the best prices I found online for tubes. Shipping was fast and the tubes arrived securely packaged. Thanks, Amplified Parts!
Great product!!! great service and attention!
Great product!!! great service and attention!
JJ's are well made tubes, bought this to replace a brand new MESA tube that was micro-phonic right out of the box. It is in a Kustom H5 head, Using the 12at7 instead of the 12ax7 to lessen the gain a little so it was more preamp/pedal friendly.
the only tubes i use for my fenders