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Electro-Harmonix 12AX7 Preamp Tube

Replacement 12AX7/ECC83 Preamplifier Tube

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Item ID: 12AX7EH

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Electro-Harmonix 12AX7 Preamp Tube

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Q: What is a 12AX7 preamp tube used for?

The 12AX7 is a very common preamp tube found in many guitar amplifiers, bass amps, and other audio equipment. It's primarily responsible for amplifying the initial signal, adding gain, and shaping the overall tone. Replacing your 12AX7 tubes can significantly impact your amplifier's sound, offering more warmth, clarity, or overdrive characteristics depending on the tube's design and your amp's circuitry.

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Q: What kind of sound can I expect from the Electro-Harmonix 12AX7EH?

The Electro-Harmonix 12AX7EH is known for its balanced tone, high gain, and low noise performance. It delivers a rich, warm sound with excellent clarity and definition, making it a popular choice for guitarists seeking classic rock tones, blues, and even modern high-gain sounds. It's a reliable tube that provides consistent performance across various musical styles.

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Q: Is the Electro-Harmonix 12AX7EH compatible with my amplifier?

Yes, the Electro-Harmonix 12AX7EH is a direct replacement for any amplifier or audio device that uses a 12AX7 or ECC83 type preamp tube. It's a standard nine-pin miniature dual triode tube. Always consult your amplifier's owner's manual or a qualified technician to confirm the correct tube types for your specific equipment before making any replacements.

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Q: How often should I replace my preamp tubes?

Preamp tubes generally last longer than power tubes, often several years depending on usage. However, they can degrade over time, leading to a loss of tone, increased noise, or microphonics. Signs it's time for a replacement include a duller sound, excessive hum, or squealing. If you're unsure, a Sweetwater Sales Engineer can help you diagnose potential tube issues.

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Excellent All-around Preamp Tube

Searching for a top-shelf replacement preamp tube for your high-gain guitar amplifier? This excellent 12AX7 vacuum tube from Electro-Harmonix boasts a high-gain, low-plate-current, dual-triode design. At Sweetwater, we've found that this tube yields extremely low noise, due to its unique spiral filament, which makes short work of annoying cathode-to-filament induced hum. If you're in need of a high-performing preamplifier vacuum tube, the EHX 12AX7 is a great all-around choice.

Electro-Harmonix 12AX7 Preamp Tube Features:

A top-shelf replacement preamp tube for 12AX7/ECC83-loaded guitar amplifiers
Boasts a high-gain, low-plate-current, dual-triode design
Excels in high-gain applications
Unique spiral filament makes short work of cathode-to-filament induced hum
Many OEMs use relabeled Electro-Harmonix vacuum tubes in their amplifiers

Resources

Guitar Amp Buying Guide

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Tech Specs

Type: Preamp
Model: 12AX7/ECC83
Quantity: Single
Manufacturer Part Number: 12AX7EH

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Reviews

4.0

Customer Photos & Videos

I've had fine results with Electro Harmonix tubes before and trust there quality control. Unfortunately these are a little larger diameter than
the stock tube on my Vintage Champ and do not fit into the socket. No worries I can use this in a different Fender Amp. I will be sure to request Chris Leonards assistance when I order another brand. Tube dimensions do not appear to be specified anywhere.

I have these in my pre-amp section on my JCM 2000 TSL100, love the tone. Perfect compliment to the rest of the amp!

Very good as always have been

These are one of my favorite options for new tubes. I've had it in my amp for hours and hours of playing so far all is well.

I switched out a Mesa 12AX7 tube for this Electro-Harmonix 12AX7 in a Marshall Valvestate 8100...I liked the Mesa but wanted to try something else...First EH lasted 15 minutes after install...contacted Sweetwater and they sent a replacement free of charge...Installed the second one and it lasted about 45 minutes before just slowly dying out....Put the Mesa back in and it works fine with no issues...could it be 2 bad tubes or something else...not sure...didn't try to get another one after the second one failed...While it worked it did sound amazing with great sustain!

See also: Amp Tubes, Electro-Harmonix, Electro-Harmonix Guitar Amp Tubes