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In short, the job of the preamp tube—when used in an actual preamp stage rather than an effects or phase-inverter stage—is to take a low-voltage audio signal that comes into it and ramp that up to a higher-voltage signal that is sent along to the next stage of the amplifier.More to the point here, though, is the fact that the gain of the first preamp tube—often referred to as a “gain stage”—very directly impacts the tone that you achieve from the amp as a whole.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.
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Do preamp tubes change tone?
More to the point here, though, is the fact that the gain of the first preamp tube—often referred to as a “gain stage”—very directly impacts the tone that you achieve from the amp as a whole.
Do preamp tubes have to match?
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.
What do vacuum tubes (valves) do?
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What is the difference between power tubes and preamp tubes?
Power amp tubes are much larger than preamp tubes. These take the preamp signal you have dialed in and amplify it to speaker levels, controllable by your amp’s master volume control.
How often do preamp tubes need to be replaced?
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.
What 12AX7 tube is best?
- JJ ECC83S.
- JJ ECC803S.
- Tung-Sol 12AX7.
- Genalex 12AX7.
- Mullard 12AX7.
- Electro-Harmonix 12AX7.
- Sovtek 12AX7LPS.
- Svetlana 12AX7.
Can you mix 12AX7 tubes?
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.) But do not swap different types of power tubes unless you are absolutely sure you know what you are doing — damage may result.
Do tube preamps sound better?
As a tube creates distortion it produces harmonics which are known as ‘even harmonics’. Essentially these are tones which are the same note but are produced higher in octaves. This is why typically a tube amplifier is said to sound better, because the harmonics it produces are much more pleasing to the user’s ear.
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Can you mix preamp 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.
How do you match a preamp tube?
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.
Can I use a preamp without an amp?
No. Even if you have the best mic preamp, there is no way to use it without an amp. A preamplifier is a supplementary device, while an amplifier plays a critical role and cannot be excluded from the system.
What amplifier do I need for 8 ohm speakers?
This means that a speaker with a “nominal impedance” of 8 ohms and a program rating of 350 watts will require an amplifier that can produce 700 watts into an 8 ohm load. For a stereo pair of speakers, the amplifier should be rated at 700 watts per channel into 8 ohms.
Why use a preamp and a power amp?
A preamp boosts a weaker signal, bringing it to line level, and a power amp boosts the line level signal before it goes to the speakers. In other words, a preamp increases signal strength to an acceptable level to transmit to the equipment in your chain.
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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.
How do I know if my amp needs new tubes?
- Excessive noise (hiss, hum) including squealing or microphonic tubes.
- Loss of high end. …
- A muddy bottom end; Sounds like there is too much bass and note clarity is lost.
- Erratic changes in the overall volume. …
- The amp doesn’t work!
Can you leave tube amps on?
Long story short, unless you plan on using your amp a lot throughout the day, you should turn off your tube amp when you are done using it. Here’s why: Tubes deteriorate with use, so leaving a tube amp on shortens tube life. Many tubes produce a significant amount of heat.
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.
Do gold pin tubes make a difference?
AFAIK, there’s no difference between regular and gold pin tubes. As already mentioned before, the pins are only gold plated, but the reason for the gold plating of pins (or any other connector) is to prevent the metal surface to corrode.
Do tubes need 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.
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.
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!
Which is better solid-state or tube amp?
Are Tube Amps Better Than Solid State? Tube overdrive is much smoother and more responsive than solid-state. It can be influenced by adding high-gain pedals to the signal chain between the guitar and amplifier, and this gives players much more control over the sound.
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Why do tube amps sound better loud?
We use tubes simply because they make the music we create sound better: smoother, warmer and cleaner. Ditto for guitar amplifiers used in creating music. The ways that tubes distort when pushed to the edge are much more musical than the artificial sounds that come from transistor amplifiers when overdriven.
Is tube better than solid-state?
The tube overdrive provides musicians with a smoother and more responsive than a solid-state amp. Tube amps can also be changed by adding on high gain pedals to signal the chain between the amplifier and the guitar, which provides musicians with the opportunity to control the sound that’s being produced.
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