Vacuum Tube - 12AX7 / ECC83, JJ Electronics
The JJ Electronic 12AX7 / ECC83 has quickly become a modern classic in preamp tubes. Its rugged design and rich harmonics make this tube an obvious choice for musicians who need a reliable and high quality tube at a reasonable price.
The balanced tone of the JJ 12AX7 works well in any amp. This versatile tube sounds excellent in clean amps offering an amazing dynamic response while also proving itself in high gain amps with its low noise and noticeably less microphonic issues than other tubes. The warm highs and transparent lows make it a great choice for any position in a tube amp. The JJ 12AX7 is the go-to tube of many amp builders and touring musicians.
Accessory Items:
| Pin Type | Our Part Number | UPC/EAN | JJ Electronics Part Number |
|---|---|---|---|
| Gold | T-12AX7-GOLD-JJ | 797734820959 | ECC83S / 12AX7, 7025 - GOLD |
| Regular | T-12AX7-S-JJ | 844632022081 | ECC83S - 12AX7, 7025 |
| 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) | 0.0287 lbs. | ||
| T-12AX7-S-JJ - Regular version | 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 | |
| T-12AX7-GOLD-JJ - Gold version | 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 |
 Specification Sheet for Regular | T-12AX7-S-JJ |
| Specification Sheet for Gold | T-12AX7-GOLD-JJ |
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Product Reviews
I put a pair of these tubes in my Morgan and haven't been happier. They help keep my tone ringing clear. This is my go-to 12ax7.
These are the only tubes I use after a 10 year tone search these are the best for tone quality and best price. These are the TONE KING! I've tried them all NOS RCA(way expensive), EH Russian Made (harsh) and Tong-Sol (not impressed). But these JJ tubes are the kats meow! Smooth and musical!
I've had the Bugera V5 guitar amp for a month and think that its a great buy for the money and fun to play through. The overall sound was good. I purchased the JJ 12ax7/ECC83 gold pin preamp tube and the JJ EL84 power amp tube to backup the stock BUGERA tubes.I decided to put the JJ tubes in and use the stock as backups. The difference was very noticeable. The amp now sounds richer with more presence and smoothness. The JJ tubes improved all ranges of EQ and general tone whether I play clean or all out distortion. It was like having a switch that went from good to better.
I replaced the china tube in my ac30vr with the jj and i gotta say i like the result some more clean head room but not to much it still breaks up really nice!!! shipping was great also.
I did not know how much the pre-amp tubes alter the tone and sound of an amp until I put 2 of the JJ12AX7 / ECC83s in my 65 Bandmaster. I have never heard a Bandmaster sound like that. I'm going to put 2 of these in everyone of my amps.
Very good. Not expensive and works really well. The shipping was also very fast. I will purchase here again.
I bought this tube as an experiment to see if the tone of my son's VOX Tonelab LE multi-effects guitar pedal could be improved. The stock tube is the Electro-Harmonix 12AX7 / ECC83, which is a very good tube to begin with, but this new tube gave his guitar more gain and also more clearly defined highs and lows. It has very low noise and breaks up more smoothly when overdriven, with more crunch and less fizz than the Electro-Harmonix. Overall it was a subtle, but discernible difference to a trained ear and well worth the investment, IMHO.
The people at Amplified Parts were a huge help in helping me decide which replacement tubes to purchase. The tubes sounded great - and I would buy again from Amplified. Thanks!
Installed on a Marshall VST-100, actually I'm looking for the perfect preamp valve to match my tastes on this amp.This one is far better than a stock jj83: a very good tube, with smooth tones, and yet a good rock distortion from low end to middle tones.Still can't decide if I prefer the even brighter and more detailed tone on distorsions of a 12AX7 (but loosing all the lower frequencies that I love and that jj series can give) or this one.Anyway I appreciate the fact that in the overall sound this valve makes a VAST difference on middle and lower tones, the amp sound really comes out, I'd like only a little more definition on high ends.
The JJs are less harsh-sounding, with less fizz than others. I used them in a Reverend Goblin, and a Twin.