Vacuum Tube - 12AX7 / ECC83, JJ Electronics

JJ Electronics
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Pictured: Gold
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Pictured: Regular
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Pictured: Regular
Pictured: Regular
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Customer image: "Perfect for my preamp."

Vacuum Tube - 12AX7 / ECC83, JJ Electronics

Starting at: $12.95
In Stock

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.

SKU:
T-12AX7-JJ-X
Item ID:
004452
Brand:
JJ Electronics
RoHS Compliant
Part Numbers
Pin TypeOur Part NumberUPC/EANJJ Electronics Part Number
GoldT-12AX7-GOLD-JJ797734820959 ECC83S / 12AX7, 7025 - GOLD
RegularT-12AX7-S-JJ844632022081 ECC83S - 12AX7, 7025
Product Measurements by Type
Body Height49.2 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 Diameter22 mm
Item Height56.3 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 Information
Packaging Dimensions1 in. × 1 in. × 2.5 in.
Weight (Packaging)0.032 lbs.
Product Measurements by Item
T-12AX7-S-JJ - Regular versionBody Height49.2 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 Diameter22 mm
Item Height56.3 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 versionBody Height49.2 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 Diameter22 mm
Item Height56.3 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

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Questions and Answers

Click each question to see its answers.
Asked by Anonymous on November 11th, 2016.
Matt H
November 11th, 2016
No, the only time you might need to rebias is when you are replacing power tubes.
Macktires4
November 13th, 2016
Will I have to rebias my EVH 5150 III amp if I put these in
Matt H
November 16th, 2016
No, the only time you might need to rebias is when you are replacing power tubes.
Asked by Anonymous on May 27th, 2016.
JustinG
June 1st, 2016
Staff Member
Top Contributor
I would suggest checking out our tech corner article comparing preamp tubes. Personally I have Tung Sol 12AX7's in mine and I think they are great for the Blues Jr. You also couldn't go wrong with the TAD premium selected 12AX7's.
Asked by Anonymous on August 24th, 2016.
Matt H
August 24th, 2016
Hi, we only match power tubes and do not balance preamp tubes.
Asked by Anonymous on May 2nd, 2017.
Matt H
May 2nd, 2017
Yes, according to the Orange website you amp takes two of these tubes.
Asked by Anonymous on May 16th, 2017.
Matt H
May 16th, 2017
The pins are gold and this helps to prevent corrosion and buildup on the tubes pins. Other than the pins, they are the same tube as compared to the regular pin version.
Asked by Anonymous on May 24th, 2017.
Matt H
May 24th, 2017
When plugged in this tube has the following dimensions: 1.94" (49.2mm) x 0.87" (22mm). You will want to measure your existing tubes to insure a proper fit.
Asked by Anonymous on August 25th, 2017.
Matt H
August 25th, 2017
The S stand for spiral filament and refers to the internal construction. This will work in any situation where an ECC83/12AX7 is needed.
Asked by Anonymous on October 6th, 2017.
Matt H
October 6th, 2017
Tube characteristics can be different from brand to brand, and because the tone of tubes can be highly subjective, we can not verify if these tubes will get you your desired tone. You can visit the "Tech Corner" of our website for a 12AX7 comparison of current made tubes. This has a wealth of information to help you make a decision.
Asked by Anonymous on February 16th, 2018.
Matt H
February 16th, 2018
The plate design on these is slightly more compact but function just like any other 12AX7.
Asked by Anonymous on June 25th, 2018.
BradWbr
June 26th, 2018
Staff Member
All information we were able to find on a Bedrock 600 stated that it uses EL84 power tubes.
Asked by Anonymous on July 20th, 2018.
CurtisG
July 20th, 2018
Staff Member
Please see our 12AX7 comparison chart that has current production 12AX7's listed by gain rating found here https://www.amplifiedparts.com/tech-corner/12ax7-comparison-current-made-tubes

Product Reviews

5.00 out of 5 based on 46 reviews
- August 28th, 2021
5 out of 5

JJ Tubes are always well made and deliver great tone. Both my amp (vox ac30) and the korg sv1 needed new 12AX7's so I ordered 4 (one as a spare as well.) The stock tubes that were replaced had seen their time come and go with the tube in the pre-amp of the korg blown. While getting into the guts of the keyboard was ridiculous (bad design flaw on Korg's part considering there is a "cute" window to see the tube glowing - you cannot access the tube from the front for an easy fix (enough of that gripe,) once the new JJ tube was installed and the keyboard reassembled, the difference was incredible immediately! With the vox, not so much because I already had JJ's in there for the pre-amp drive. All in all, JJ tubes are fantastic - clean pure tones and powerful delivery! Amplified Parts is a big part of this equation - their tube comparison charts, customer service and product lineup are top notch. Shippng was fast (we needed these in place in 3 days so I opted for 2 day shipping) and we were back up in running right on schedule. Thanks to everyone at Amplified Parts for a job well done!

- May 31st, 2021
5 out of 5

The jj83s is an excellent 12ax7 preamp tube, low microphonics, high gain with compression. Use in my Bogner 101b and Fuchs custom Wildcard 100 D style amp in gain channel. Highly recommend this tube.

- May 28th, 2021
5 out of 5

Great tubes for Blackstar amp. The gold connectors make a big difference.

- April 12th, 2021
5 out of 5

Great tube replacement for my Jolida 1501 BRC integrated amp. The gain is lower than the Tung Sols that were there before, and that's what I was trying to achieve. The tubes sound very good right of the bat, then improve with the break in.
Highly recommend these tubes if you're looking to lower your gain.

- February 9th, 2021
5 out of 5

Solid, economical and consistent. Love their tone in my Peavey 5150II amp.

- January 17th, 2021
5 out of 5

Spare replacement tube, arrived in good shape!

- December 27th, 2020
5 out of 5

Purchased to re-tube a block letter 5150. Tubes arrived next day and were extreme well packaged! The amp sounds absolutely incredible!

- September 13th, 2020
5 out of 5

I put this in my 50 year old Harmony 410A amplifier. This was a drop in replacement for the tube that was originally in the amp. Now my first amplifier from childhood that ended back in my hands after many many years is functioning perfectly.

- September 2nd, 2020
5 out of 5

Really happy with the service from Amplified Parts. This was my first order with them, and I got an order confirmation very quickly, and their site was very good at providing updates. My tubes were shipped the same day I ordered them and they arrived faster than I expected. Thanks!

I was previously running Groove Tube 12AX7's in my amp but see the JJ's highly recommended across various guitar forums I visit. I bought a complete set of 12AX7's and EL84's. I really didn't expect much of a difference, but boy was I surprised. After I plugged these in, my tone was night and day difference over the groove tubes. My amp has never sounded so good, and I didn't want to stop playing. It sounded much more alive, bright, and with a better mid-range punch. These were the gold pin JJ's and I have not compared them to their standard 12AX7's, so I'm not sure how much, if any, a difference the gold pins make. I might try the standard tubes next time just to see if the additional cost is worth it. Bottom line, you won't be disappointed with either JJ tubes or the service from Amplified Parts.

- June 24th, 2020
5 out of 5

I did not know how many power tube I needed to replace. But since the amplifier is dated 2003, might as well replace all of them. The replacement was successful. Minor adjustment to bias, as advertised. Great tubes, sounds just as good as the OEM tubes.