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Using 12AX7s as an example, matching these preamp tubes is a good idea, but by no means essential. These tubes, along with the 6DJ8 variety, are known as linestage tubes. When they are matched, this will ensure that you get even gain from both tubes.You should be able to swap preamp tubes of the same type without problem. For example, any 12AX7 should be compatible with another 12AX7. With power tubes, you can swap different brands of the same tube. (For example, 6L6 tubes from different manufacturers.)Preamp tubes don’t need to be matched. The two triodes in preamp tubes operate independently in different circuits. So there is no need to match them.
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Can I mix and match preamp tubes?
You should be able to swap preamp tubes of the same type without problem. For example, any 12AX7 should be compatible with another 12AX7. With power tubes, you can swap different brands of the same tube. (For example, 6L6 tubes from different manufacturers.)
Is it important to match preamp tubes?
Preamp tubes don’t need to be matched. The two triodes in preamp tubes operate independently in different circuits. So there is no need to match them.
Why vacuum tubes need matching
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Do 12AX7 tubes need to be biased?
With preamp tubes, you don’t need to worry about things like biasing or using matched pairs as you do with power tubes. As long as your new tube is the same model as what you’re replacing (12AX7, 12AT7, 6SN7, etc.), you’re good.
Do vacuum tubes have to be matched?
Power tubes require matching because the way they amplify signal can create exceptionally bad sound if they are poorly matched, but pre-amp tubes generally aren’t used this way and so matching them is unnecessary.
Are all 12AX7 tubes the same?
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.
How important are matched 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.
What 12AX7 tube is best?
- JJ ECC83S.
- JJ ECC803S.
- Tung-Sol 12AX7.
- Genalex 12AX7.
- Mullard 12AX7.
- Electro-Harmonix 12AX7.
- Sovtek 12AX7LPS.
- Svetlana 12AX7.
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How do you know if your tubes are matched?
To be specific, mis-matched tubes can be bias-adjusted so that output sound is centered. However, if the tubes aren’t a true match, then one channel will not sound as “lively” as the other – sort of like a dead can. With experience, this is easily discernable by ear.
How are vacuum tubes matched?
Some companies offer matched sets of replacement tubes. This means that the tubes have been tested — the plate current draw is measured under normal operating conditions — and each tube in the set has been determined to have the same current draw.
What happens if tubes are not biased?
If you changed to tubes with a lower resistance without biasing the amp you would quickly burn through those tubes and potentially damage the amp and yourself in the process. This is because the amp is still pushing out current at a higher level than the valves are able to take. Until it’s been correctly re-biased.
Do you need to Rebias preamp tubes?
You absolutely DON’T need to re-bias pre-amp stages in a guitar amp. In 99.99% of guitar amps, these are cathode biased stages, which bias themselves essentially. Power tubes are a different story, and depend amp to amp whether biasing is necessary.
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Are preamp tubes self-biasing?
In the vast majority of cases, preamp tubes are self-biasing. Therefore, there’s no need to tamper with the bias at all, even when replacing the tubes with a new set. A mechanism called a fixed resistor takes care of the biasing process.
How do you match tubes without tube tester?
Oh, you could use a preamp or power amplifier to match tubes, taking measurement of plate current, bias current but you really have to know what you are doing as you are working with 100 to 500 volts and enough current to kill, but this is a very accurate way to check tubes as they are “in” the circuit intended for …
What is the highest gain 12AX7?
If you go with new production the JJ ECC83S(12ax7) is the highest gain out of all the new production pre amp tubes. I have actually found that Chinese Shuguangs, and Russian RI, Tung Sol, and RI Mullard tubes to have more gain than the JJ ECC83 which is actually a much darker sounding tube than most CP tubes.
How long do 12AX7 tubes last?
Small signal tubes like a 12AX7 or 6922 will work well on average for about 10,000 hours. If you leave your equipment on 24 hours a day, well you do the math: There are 8,760 hours in a year.
What amps use 12AX7 tubes?
The most common preamp tube for tube guitar amplifiers is the 12AX7. They have been in use since 1947 – so the Fender Tweed’s, Vox’s, Supro’s, and many other amps up through the modern Marshall DSL100 amps use 12AX7 preamp tubes.
What is a matched and balanced tube?
Balanced: When the plate current draw of each triode is the same, we refer to that as having balanced triodes. High Gain: Tubes that measured to have higher gain. Matched: Each triode of the preamp tube has matching gain.
What is Apex tube matching?
Apex Tube Matching® is a complex multi-step process designed to ensure that you get the highest-quality matched tubes available. We perform extensive testing and analysis on each tube that runs through our system to provide an incredibly accurate and precision-matched tube set.
What is a burned in tube?
For burn in, 50-100 hours is how long most new tubes need to sound their best. You don’t need to play music through the tubes, just leave it on for the time to put the hours on. After that every time you turn it on it takes about 20-30 minutes for the tubes yo warm up. 1.
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.
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How do I know if my preamp tubes are bad?
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. Bad preamp tube symptoms can lead you to the faulty one if you know what to look for.
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.
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