12AX7 vs 12AT7 vs 12AU7 Tube Shootout (Differences, Which To Buy) (2022)

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  • Confused about which tubes to get?
  • What are the differences between 12AX7 vs 12AT7 vs 12AU7 tubes?
  • Learn common applications and options for swapping tubes.

12AX7 vs 12AT7 vs 12AU7 Tube Shootout (Differences, Which To Buy) (1)

Tubes, or valves as some call them, are found in all manner of electronic equipment, from guitar amplifiers to boutique preamps, and there are even tube-powered microphones. While there are hundreds of different types of tubes, a select few tend to be used in pro audio equipment.

However, even those few types that get used frequently in audio equipment can still be confusing, so I’m here to help clear things up for you, specifically with three of the most commonly used preamp tubes, the 12AXY, 12AT7, and 12AU7.

12AX7 vs 12AT7 vs 12AU7: Differences Explained

The biggest difference between these power tubes is the amount of gain they will provide. The 12AX7 has a gain factor of 100, while the 12AT7 has 60. The 12AU7 has the smallest, at just 20.

The lower gain of the 12AT7 and 12AU7 also allows them to have a higher headroom, which can provide a warmer and cleaner sound.

What Is Gain/Amplification Factor?

The amplification factorµ of a triode valve / vacuumtube is a measure of the relative effectiveness of the grid and anode voltages in producing the electrostatic fields at the surface of the cathode.NME

12AX7 Tubes

12AX7 vs 12AT7 vs 12AU7 Tube Shootout (Differences, Which To Buy) (2)

JJ 12AX7 / ECC83 Preamp Vacuum Tubes

$79.99

Well balanced colourful tube with strong lows & mids whilst also providing smooth highs,allowingfor more clean head-room compared to some of thehigher gain 12AX7s.

View Price On AmazonView Price On Sweetwater

08/28/2022 12:27 am GMT

(Video) DIFFERENCE of GAIN 12AU7 vs 12AT7 vs 12AX7 Preamp Tube comparison shootout

The 12AX7 tube is probably the most common tube used in any audio equipment. It was first introduced in the 1940s and has been in almost continuous use and production in all manner of audio equipment developed since then. It’s unusual to find any tube guitar amp without at least a single 12AX7 in it, most commonly in the preamp.

The 12AX7 is known for its very high gain capabilities (100 times the initial input voltage), and its small size and cheap production cost has also contributed to its longstanding use.

12AT7 Tubes

Fender Groove Tubes GT-12AT7

Quite simply the best 9-pin triode preamp tubes you can buy - specifically designed and tested for musical instrument amplification and standard equipment on Fender amps.

Why We Love It:

  • Outstanding and consistent performance
  • Has a great signature tone

View Price On Guitar CenterView Price On Amazon

The 12AT7 tube is almost identical in looks to the venerable 12AX7 tube, and in many ways can be used for the same applications as a 12AX7. However, the 12AT7 features a somewhat lower gain (typically about a factor of 60-70) and runs at a higher current.

What does this mean for the sound? A 12AT7 tube will give you slightly less volume, lower gain, and a higher headroom than a 12AX7 tube. If you’re looking to make an amp sound warmer or just have a little bit of extra headroom, you can try swapping a 12AX7 for a 12AT7 and see if you like the results more.

12AU7 Tubes

JJ Electronics 12AU7 / ECC82 Preamp Vacuum Tube

$18.53

(Video) Preamp Tube Comparison: 12AT7 vs 12AU7

ECC82 is a 12AU7 medium gain pre-amplifying double triode. Provides a very smooth sound with well-defined tones suitable for audio and guitar amplifiers.

Why We Love It:

  • Smooth sounding
  • Low price

View Price On Guitar CenterView Price On Amazon

The 12AU7 tube also looks similar to 12AX7 and 12AT7, but its applications are typically very different.

12AU7 tubes have very low gain (typically only about 20), which gives them a great amount of headroom and a much higher current.

This is typically not enough amplification to actually drive a guitar signal enough to sound good. Typically 12AU7 tubes are used in tube-driven effects within guitar amps (such as spring reverb or tremolo effects in Fender amps) and are commonly used in microphone preamps and tube microphones.

While you can physically use a 12AU7 tube in place of a 12AX7 in a circuit, it’s not recommended to do. Most circuits that are designed for a 12AX7 will not react well to the significantly lower gain of the 12AU7. It can also cause issues with the bias of the amplifier, which can lead to very serious damage, including blowing the amp circuit!

FAQ

What Does A Tube Do?

Without getting too far into the physics of it, tubes are electronic devices that amplify the electrical current of your signal. Another way to think about: consider a small, low wattage tube guitar amp (like a Fender Champ) and a large, high wattage guitar amp (like a Mesa/Boogie Dual Rectifier).

A Fender Champ only has 1 tube in the preamp section, and a total of 3 tubes in the entire amp circuit, while a Dual Rec has 5 tubes in the preamp section, and 11 in its entire circuit. A Champ doesn’t put out much volume, and is only rated at 5 watts, while the Mesa is rated at 100w and will easily shake your entire apartment floor and irritate the neighbors when you crank it up.

(If you want to go loud without creating a fuss, check our guide to the best amp-in-a-box pedals for getting hot amp tones without the volume).

Essentially, more tubes = more power = more gain and output volume.

This generalization may not always apply, but for the purposes of this article, it’s good enough!

In the circuit of a guitar amp, there are two major sections where you will commonly find tubes. The first is in the preamp section, which is where the very low output signal from your guitar is amplified. From there, the signal can be sculpted by the amp’s equalizer section, and you can control the overall volume from the input with the gain control.

The other is in the power amp section, where the signal is amplified even further to actually project sound out of the amplifier through a speaker. Since these two different applications require vastly different amounts of amplification, different tubes are typically used.

12AX7 tubes and their variants are most commonly used as preamp tubes.

In other tube-based pro audio gear, such as standalone tube preamps, the tube operates in the same manner as in the guitar amp mentioned above, but instead of being connected to the guitar amp’s power section, the tube preamp is connected to a mixer or your audio interface.

What Is The “Best” 12AX7 Tube?

Many people like to ask the simple question of “what’s the best 12AX7 tube?” But the answer is not so straightforward.

As mentioned above, the various different brands and variants of tubes are generally designed for different objective applications more so than of differing “qualities.” It’s also important to note that pretty much all tubes used in audio equipment come from one of 3 different factories that all produce the tubes for every brand.

The actual difference between brands comes down to the testing that each manufacturer does to ensure that quality control between different tubes of the same brand/label are within their set tolerances.

(Video) Sound difference between 12AX7-12AT7-12AY7 & 12AU7

Each company does hold their tubes to different levels of QC, which can result in the various “good” and “bad” tube brands that you see all over guitar forums.

Personally, I’ve always loved Electro-Harmonix 12AX7 tubes, especially for guitar.

They are affordable and give your amp a little bit of an extra gain boost. There’s also a midrange presence that really makes for a nice, crunchy overdrive sound.

Mesa Boogie also makes really high-quality 12AX7s, and they are rigorously tested to some of the highest standards to ensure that they all work well in your equipment.

Ultimately, you should do what makes the most sense for your financial situation! Don’t let naysayers lead you astray in the idea that only the most expensive tube is good enough, because in 99% of situations you’re not going to actually notice!

Are 12AX7 and 12AU7 Interchangeable?

Important: Always check your amps circuit/manual before swapping out a component to avoid damaging your amp.

See Also

(Video) 12AX7 vs. 12AT7 vs. 12AU7 in V1 and V2: Distortion/gain tube comparison

Technically, yes, you can physically interchange a 12AX7 tube for a 12AU7 tube in your amp without risk of major damage to your amp. However, it’s usually not recommended to do so, because the huge difference in gain between the 2 tubes usually won’t give you a very good sound (and it’ll be significantly quieter than it was before).

The other issue you can run into is the fact that the 12AU7 has a higher plate voltage than a 12AX7, and this difference can cause a host of problems in your amp circuit that was designed around the use of a 12AX7.

So really the answer is “technically yes”, but you still should not swap them!

If you own a hybrid amp, definitely do NOT attempt to swap them out. Hybrid amps are a different beast altogether. Always check your amps circuit/manual before swapping out a component to avoid damaging your amp.

Do Preamp Tubes Affect Tone?

It is absolutely true that guitar preamp tubes affect the overall tone and response of your guitar amp (or any other audio equipment for that matter). Different brands tend to design their tubes for different applications, even for the same model numbers.

Some 12AX7s are designed for the absolute highest amount of gain possible, while others are designed to last a long time or be the most durable. It’s important to try out different brands of tubes in your own equipment to see which ones you like best.

In most guitar amps, the most significant tonal change from a tube will come from the V1 guitar preamp tube. This tube is the first thing that your guitar hits in the amp, and it has a significant role in shaping the overall sound of your signal.

One of the most common things to experiment with is swapping the V1 tube that comes with your amp with another. This is almost always going to be a 12AX7 tube, but it ultimately depends on your amplifier’s circuit, so it’s important to double-check your amp or its schematic to make sure!

Another common swap that guitarists make is to swap a 12AT7 tube for the commonly used 12AX7 used in the V1 position. If you’re looking to give your amp a little bit more clean headroom or want your tone to sound warmer, this is a super easy and simple “mod” you can do that’s about as easy as changing a lightbulb.

With that being said, I’ve never tried this out to see if it makes a significant difference, and the extent to which it does affect your tone is always going to be subjective.

Final Thoughts

While this article only scratched the surface of the various intricacies of guitar amp preamp tubes, we’ve hopefully brought some understanding to the major differences between the various common preamp tubes you’ll find in most guitar amps today.

With some careful research and planning, you can find the right tubes for your amp that won’t cause any problems in the long run. As always, please rely on a professional to install them, unless you are absolutely sure what you are doing!

(Are you new to guitar or just want to improve your skills? Check out our reviews of JamPlay and Guitar Tricks if you want to learn online with the pros!)

FAQs

Can I replace 12AX7 with 12AT7? ›

You can interchange a 12AX7 with 12AT7, 12AU7, 12AY7 or 5751 as they are all the same pin structure, however they will each give you a different result in your amp. Each of these tubes has a different gain factor, which means some will give higher gain and others lower gain.

Can I use 12AX7 instead of 12AU7? ›

Are 12AX7 and 12AU7 Interchangeable? Important: Always check your amps circuit/manual before swapping out a component to avoid damaging your amp. Technically, yes, you can physically interchange a 12AX7 tube for a 12AU7 tube in your amp without risk of major damage to your amp.

What is the difference between 12AX7 and 12AT7? ›

Main Differences Between 12AX7 vs 12AT7 Tubes

The main differences between 12AX7 vs 12AT7 are: The 12AX7 has a gain output of 100, whereas the 12AT7 has a gain output of 60. The 12AX7's high gain can make it prone to clipping and distortion, whereas the 12AT7 can give you more headroom.

Can I use 12AT7 instead of 12AU7? ›

The 12AX7, 12AT7, and 12AU7 all belong to the same family of nine contact, twin triode tubes. In many cases, these tubes are interchangeable and can easily be swapped.

What is a 12AU7 tube used for? ›

The 12AU7 is a miniature medium-mu twin triode. This tube finds use as a phase-inverter/splitter in push-pull amplifier circuits in ac/dc radio equipment and in many diversified applications such as multivibrators or oscillators in industrial control devices.

What is 12AT7 used for? ›

The 12AT7 is found in many high fidelity applications, as each triode section in normal use operates as a class A amplifier. They also turn up in line and microphone preamplifiers, musical instrument amps, and vacuum tube equipped recording equipment.

What can I replace a 12AX7 tube with? ›

Knowledge is power, and knowing an unusual substitute may be a true joy.
  • Small Signal Tubes:
  • 12AX7. Substitutes: ECC83, 12AX7A, 12AX7WA, 7025, 5761,6057,6681,7494,7729, 7025#, ECC83#, 6L13, 12DF7, 12DT7, 5751, 7025A, B339, B759, CV4004, E83CC, ECC803, M8137. ...
  • 12AU7. ...
  • 12AT7. ...
  • 6DJ8. ...
  • Rectifier Tube:
  • 5AR4. ...
  • Other Dual Triode Tubes:

Do preamp tubes need to be matched? ›

Preamp tubes are, in the majority of cases, self-biasing. Therefore, they do not require matching. Only tubes that are in a push/pull Class AB circuit need to be matched because they share a common bias voltage. Power tubes are an example of this.

Is ECC82 the same as 12AU7? ›

The 12AU7 name is its American or “common” name while the ECC82 title is its European name and Mullard Phillips tube designation. There is no difference between the components of the two tubes and they are interchangeable.

Do preamp tubes affect tone? ›

Used in this way, preamp tubes can produce a scorching, harmonically saturated lead tone that sustains all day—what we usually hear as a classic shred or contemporary rock tone—in an amp that really relies on its output tubes just to amplify this sound, rather than to add further distortion to it.

How often should you change tubes in amp? ›

If it's been a few years or you regularly change your power tubes and feel like the amp has become lifeless, it may be time to freshen up your preamp tubes. If you play regularly, power tubes should be changed every 6 months to a year. If you don't play frequently, they can last longer.

Can 12AX7 be used in phase inverter? ›

The 12AT7 is probably best known for its use in reverb stages or in the phase inverters of blackface and silverface Fender amps of the '60s and '70s, but it can also be used in the V1 (or equivalent) position in many amps to lower that first stage's gain and thereby achieve more headroom and a tighter overall tone.

Are ECC83 and 12AX7 the same? ›

The ECC83 Valve – also known as the 12AX7.

The 12AX7 Valve (or 12AX7 vacuum Tube) is a small preamplifier valve which is identical to the ECC83 – same valve, just a different name. It has two identical triodes both of which have a high voltage gain. It is used in 99% of all guitar amplifiers.

Is 12AX7 the same as 7025? ›

The ECC83 (12AX7) Valve

In 'theory' you'll get a bit lower noise and lower hum with a 7025. Otherwise, they are identical.

What is the difference between 12AX7 and 12AY7? ›

The 12AY7 tubes are not 12AX7's and have many different properties. They draw more current than a 12AX7 as well as having different internal capacitance between elements and a different plate dissipation. Because of these differences, they sound different in a circuit designed for a 12AX7 tube.

Is ECC88 same as 6922? ›

The E88CC is a substitute for the 6922. The ECC88 is a substitute for the 6DJ8. The 6922 has a max voltage of 220 volts. The 6DJ8 has a max voltage of 120-130 volts.

What is a 5963 tube? ›

The 5963 tube will replace 12AU7 Tube Types and is equivalent to the European ECC82 tube and can be used in any 12AU7 or ECC82 circuit. Various brands in stock. 12AU7 Tube Types.

Do power tubes make a difference? ›

It has no effect on the sound. This phenomenon only happens in a tube with better-than-average vacuum (pure). Therefore, the tube is actually a better-quality tube!

Do preamp tubes go bad? ›

Preamp tubes can go bad at any time and for any reason. There is normally no way to determine how long they will last. Sometimes the heater inside can fail and will no longer glow. This will prevent it from working completely.

Are all amp tubes the same? ›

Different tubes can noticeably change the tone of an amp, so it can be worthwhile to experiment with various tubes to find the ones that your amp “likes” the best. Just make sure the tubes are compatible before you proceed!

How long does a 12AX7 tube last? ›

Small signal tubes like a 12AX7 or 6922 will work well on average for about 10,000 hours.

How often should you replace preamp tubes? ›

Preamp Tubes are generally at their best 2 - 3 years. Power Tubes are generally at their best 1 - 1.5 years. Rectifier Tubes are generally at their best 3 - 5+ years.

How long does a ECC83 last? ›

The European versions of the 12AX7 were labelled as ECC83, ECC803 or 7025 tubes, the design principles are identical. The longevity of tubes depends on many factors and can be as short as several hundred hours as well as 10,000 hours. However, the life of any tube will eventually end and the time of replacement comes.

Can you replace 12AX7 with ECC83? ›

Some people might worry about whether or not you can substitute the ECC83 for a 12Ax7, and many guitar shops will only carry one brand of preamp tube. If that brand is an ECC83 tube, you might be hesitant to make a purchase, but you needn't be. The ECC83 tube will perform the same as the 12Ax7.

Can you mix pre amp tubes? ›

It is perfectly okay to mix preamp tubes. In fact, it might be recommended in some cases. The reason why some musicians mix and match preamp tubes is because using different tubes can change or improve the tone of your preamp or amp.

Can I substitute 12AX7 for 12AX7A? ›

no difference anyways. Correct. The 5751 has a lower mu than the 12AX7A so these are NOT equivalent. NEVER replace a 12AX7(A) and its' equivalents numbers in a phono preamp unless you're sure RIAA correction does not depend on its' characteritic values.

How important is it to match tubes? ›

Power tubes are electrically matched so each tube will have the same amount of “idle” plate current and amplification characteristics when used in an amplifier. This is done so the tubes can work together in your amp giving you optimal sound quality and tube longevity.

Is biasing a tube amp necessary? ›

When does a tube amp need to be biased? On 95% of all tube amplifiers, you'll need to bias the amp whenever you change tubes. Some amps will never need to be biased because they come out of the factory at a fixed bias like Mesa/Boogie amps.

Is it OK to touch vacuum tubes? ›

It is OK to handle ambient cooled vacuum tubes with bare hands, IF THEY ARE COOL, and skin oils will seldom cause a problem, even if it chars.

How long do 12AU7 tubes last? ›

Tube Life. Small signal tubes like 12AX7 and 12AU7 typically last between 5,000 and 10,000 hours. You don't need a tube tester to determine if your tubes need replacing. Simply plug in a new pair and let them settle in for at least 100 hours.

Is ECC82 same as ecc83? ›

They are interchangeable, just the ECC82 will be a have slightly less gain. The voltage gain of a valve is entirely dependent on the circuit in which it operates.

What is a 12AV7 tube? ›

TUBES. DESCRIPTION AND RATING. The 12AV7 is a miniature, medium-mu twin triode for use as a radio- frequency amplifier or as a combined oscillator and mixer in VHF television receivers. It may also be used as an audio-frequency amplifier.

How do I know if my 12AX7 tube is bad? ›

How to Spot a Bad 12AX7 Preamp Tube by Eyesight - YouTube

Do different preamp tubes sound different? ›

That aside, different tubes do also present different sonic characteristics, and this means that even different types used to perform the same function can sometimes slightly alter the overall feel and sound of an amp. As a rule, the preamp tubes are the smaller tubes in most types of guitar amplifiers.

How can I make my amp sound better? ›

Getting a Good Clean Tone
  1. Select your clean channel or turn the gain down if you don't have multiple channels. ...
  2. Turn off all amp effects and effect pedals. ...
  3. Bring the bass, mid & treble knobs all to 12 o'clock. ...
  4. Keep the gain fairly low and adjust the volume to a suitable level. ...
  5. Jam for a while to get a feel for the tone.
27 Jun 2016

What happens if you leave a tube amp on too long? ›

There is always risk of damage wherever heat is involved, but the biggest issue with leaving a tube amp on all the time is if a tube blows. This can turn the amp into a dangerous hazard. It could even start on fire, which is a pretty big deal, especially if no one is around to call the fire department.

How long should you warm up a tube amp? ›

As a rule of thumb, your tube amp needs to be warmed up for 20 to 30 minutes at least before you can start playing your guitar. Most of the time, tube amps have warm up specifications included in their instructions for use.

How long should you let a tube amp cool down? ›

Your amp will cool down to a safe temperature in between 1 to 3 minutes after you turn it off. This wait is important if you are planning to transport it since hot valves are slightly more fragile. Adding 1 to 3 minutes of stand-by before this will make the heat dissipate slower and stress the valves less.

How important is the phase inverter tube? ›

It makes sense that the phase inverter is very important. It's feeding the signal from the pre-amp into the power-tubes and has to make that signal change very cleanly, without adding any distortion.

Is 12AX7 the same as ECC81? ›

12AT7 versus ECC81 valve.

They only differ in name. Confusing, but there it is! One (12AT7) is the American designator and the other (ECC81) is the British. If you own a valve guitar amplifier it is highly likely to have at least one 12AX7 (ECC83) in it.

What's a phase inverter? ›

[′fāz in‚vərd·ər] (electronics) A circuit or device that changes the phase of a signal by 180°, as required for feeding a push-pull amplifier stage without using a coupling transformer, or for changing the polarity of a pulse; a triode is commonly used as a phase inverter.

How much current does A 12AX7 draw? ›

12AX7
Typical class-A amplifier operation
Amplification factor100
Anode voltage250 V
Anode current1.2 mA
18 more rows

How many pins does A 12AX7 have? ›

12AX7 has eight pins. Pin 1 is the Shell 6V6 pin and pin 2 is the heater pin. The plate pin is the third pin and the fourth pin is the screen grid. The fifth pin is the control grid and the sixth is the none pin.

What's the difference between 6L6 and EL34? ›

The 6L6 vs EL34 tubes have been rivals for many years, but what's the difference? The main difference between the 6L6 and EL34 tubes is that they have different sounds and electrical operating parameters. The EL34 is much more scooped sounding and doesn't have the same amount of headroom that the 6L6 offers.

Are 12AX7 and 12AU7 interchangeable? ›

You can interchange a 12AX7 with 12AT7, 12AU7, 12AY7 or 5751 as they are all the same pin structure, however they will each give you a different result in your amp. Each of these tubes has a different gain factor, which means some will give higher gain and others lower gain.

What is the gain of a 5751 tube? ›

5751 is the designation for a low-voltage, low-noise avionics vacuum tube popular as a pre-amplification tube in guitar amplifiers. The 5751 is a modified version of the 12AX7 and, having a gain factor of 70-80 (as opposed to the 12AX7's 100), is used to "soften up a harsh modern amp".

How a 12AX7 tube works? ›

The 12AX7 middle and right is a dual triode tube--two tubes in one. Pin 1 connects to the Plate (output), Pin 2 the Grid (input), Pin 3 the Cathode (source of electrons). Pin 6 connects to the 'B' triode's Plate, Pin 7 the Grid, Pin 8 the Cathode. Pins 4, 5 & 9 connect to the heater filaments.

Are 12AX7 and ECC83 interchangeable? ›

The 12AX7 Valve (or 12AX7 vacuum Tube) is a small preamplifier valve which is identical to the ECC83 – same valve, just a different name. It has two identical triodes both of which have a high voltage gain. It is used in 99% of all guitar amplifiers.

Do preamp tubes need to be matched? ›

Preamp tubes are, in the majority of cases, self-biasing. Therefore, they do not require matching. Only tubes that are in a push/pull Class AB circuit need to be matched because they share a common bias voltage. Power tubes are an example of this.

What is the difference between 12AX7 and 12AY7? ›

The 12AY7 tubes are not 12AX7's and have many different properties. They draw more current than a 12AX7 as well as having different internal capacitance between elements and a different plate dissipation. Because of these differences, they sound different in a circuit designed for a 12AX7 tube.

Do preamp tubes affect tone? ›

Used in this way, preamp tubes can produce a scorching, harmonically saturated lead tone that sustains all day—what we usually hear as a classic shred or contemporary rock tone—in an amp that really relies on its output tubes just to amplify this sound, rather than to add further distortion to it.

What can I replace A 12AX7 tube with? ›

Knowledge is power, and knowing an unusual substitute may be a true joy.
  • Small Signal Tubes:
  • 12AX7. Substitutes: ECC83, 12AX7A, 12AX7WA, 7025, 5761,6057,6681,7494,7729, 7025#, ECC83#, 6L13, 12DF7, 12DT7, 5751, 7025A, B339, B759, CV4004, E83CC, ECC803, M8137. ...
  • 12AU7. ...
  • 12AT7. ...
  • 6DJ8. ...
  • Rectifier Tube:
  • 5AR4. ...
  • Other Dual Triode Tubes:

How long does A 12AX7 tube last? ›

Small signal tubes like a 12AX7 or 6922 will work well on average for about 10,000 hours.

How often should you change your preamp tubes? ›

Preamp Tubes are generally at their best 2 - 3 years. Power Tubes are generally at their best 1 - 1.5 years. Rectifier Tubes are generally at their best 3 - 5+ years.

How often do amp tubes need to be replaced? ›

If it's been a few years or you regularly change your power tubes and feel like the amp has become lifeless, it may be time to freshen up your preamp tubes. If you play regularly, power tubes should be changed every 6 months to a year. If you don't play frequently, they can last longer.

How important is it to match tubes? ›

Power tubes are electrically matched so each tube will have the same amount of “idle” plate current and amplification characteristics when used in an amplifier. This is done so the tubes can work together in your amp giving you optimal sound quality and tube longevity.

Is ECC82 the same as 12AU7? ›

The 12AU7 name is its American or “common” name while the ECC82 title is its European name and Mullard Phillips tube designation. There is no difference between the components of the two tubes and they are interchangeable.

Is 12AX7 the same as 7025? ›

The ECC83 (12AX7) Valve

In 'theory' you'll get a bit lower noise and lower hum with a 7025. Otherwise, they are identical.

What is the gain of a 5751 tube? ›

5751 is the designation for a low-voltage, low-noise avionics vacuum tube popular as a pre-amplification tube in guitar amplifiers. The 5751 is a modified version of the 12AX7 and, having a gain factor of 70-80 (as opposed to the 12AX7's 100), is used to "soften up a harsh modern amp".

How do I know if my 12AX7 tube is bad? ›

How to Spot a Bad 12AX7 Preamp Tube by Eyesight - YouTube

How long can tube amps be left on? ›

How long can you leave a tube amp on? A tube amp is designed to be on for long periods of time. This, however, is not a recommendation. Most manufacturers will recommend no more than 6 to 8 hours of continuous play with at least a 30-minute cool-down break.

What does a bad preamp tube sound like? ›

A bad preamp tube will become very noisy and produce hiss, crackle, and pop sounds, or create volume drops or loss. In some rare conditions, the tube can also lose its vacuum and fail completely.

Videos

1. Fender Hot Rod Deluxe Tube Shoot-Out (12AX7 vs 12AT7 & 6L6 vs 6v6)
(Second Day Music)
2. Telefunken 12AX7 vs Tung Sol 12AU7 vs Sylvania 12AT7
(VACUUM TUBES AND GUITARS)
3. 12AX7, 12AT7, 12AY7 - Guitar Preamp Tube Shootout (Milkman Hi-Fi 5W Mini Amplifier Head)
(Adjustable Bias)
4. 12AX7 vs. 12AU7 in V1 and V2: Distortion/gain comparison
(Wrigglyaudio)
5. What's with the tubes??? 12AT7 vs 12AU7 vs 12AX7
(Volture Pedals)
6. RCA 7025 vs GE 12AX7 vs TUNG SOL 12AX7 vs 3 RCA 12AT7 Tube Tone Comparison
(VACUUM TUBES AND GUITARS)

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