JJ 12AX7/ECC83 Slovakia Preamp Tube

Vacuum Preamplifier Tube, 12AX7/ECC83JJ Tesla/JJ-Slovaki, Rated Medium
JJ 12AX7/ECC83 Slovakia Preamp Tube image 1
JJ 12AX7/ECC83 Slovakia Preamp Tube image 1
Sweetwater Savings: $10.01 MSRP: $25.00

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JJ 12AX7/ECC83 Slovakia Preamp Tube
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Quality Tubes from Electro-Harmonix!

Electro-Harmonix tubes are among the highest quality. Engineered, designed, and manufactured to exacting standards for musicality and overall warmth, you can trust an Electro-Harmonix tube to deliver premium tone.

This is the Electro-Harmonix/New Sensor 12AX7/ECC83JJ Tesla/JJ-Slovakia preamplifier tube, rated medium.

Quality Gear from Electro-Harmonix
Electro-Harmonix has been inspiring musicians with their groundbreaking effect pedals, vacuum tubes, and other accessories for more than 30 years. From the legendary riffs of Jimi Hendrix and George Clinton to the new-school licks of Slipknot and Korn, some of the most influential and popular musicians of all time have relied on Electro-Harmonix to provide innovative and top-quality effects pedals and other equipment. The proof is in the pedals, so choose your poison and make some noise. Whatever your style, there's a stompbox with your name on it from Electro-Harmonix!

Additional Media

Guitar Amp Buying Guide

Tech Specs

Type Preamp
Model ECC83 Tesla/Slovak
Manufacturer Part Number 12AX7/ECC83JJ Med

Customer Reviews

Based on 4 reviews
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What a difference!

I bought a used Zoom G9.2tt several months ago and have been dissapointed with it as it was really noisy. I was considering selling it but i thought i would try new tubes 1st. I replaced the 2 chinese 12ax7's with one of these medium tesla/slovaki tubes and for the other tube i used The electro harmonix Mullard. My zoom is perfect now! All the noise is gone, and it sounds awesome, and it only took about 15 minutes to swap them.

Washes the mud away

These things worked great as replacements for the Chinese 12ax7s that come in JetCity amps.

Re-Tubed Micro Terror

I recently purchased the Micro Terror from Orange and thought I'd try swapping out the tube to see what happens. It had a JJ in it which is supposedly a good tube. I had one of these ElectroHarmonix kicking around , that I had used in my Fender Hot Rod Deluxe. I put it in and, though subtle, I think it's warmer and a little less unruly, if I can use that expression. There was NO reason to put the original back in. These tubes work great. Of course, tubes are finicky.
Music background: Hobby

Too noisy for me

I retubed and put this in the fist position (V1) and it was noisy as all get out. I had another tube sent to me and it was the same thing. Lots of hiss. I could never, ever use this in the studio. That being said though, the tone seemed decent through all that hiss. I have a Genz Benz Black Pearl 30 combo. It was at least 4-5 times as noisy as the stock tubes which I replaced because they were gritty. I run my master on full volume, with little overdrive, if any to the pre section. I get my over drive by pedal and like clean chords.
Music background: Playing guitar 50 years
See also: Replacement Tubes, JJ, JJ Miscellaneous Guitar Amp Accessories, JJ Guitar Amp Tubes