As you probably know, preamp tubes are called dual triodes. Each tube contains two circuits that should be matched. However, in the real world, they aren't. However, the tube really isn't that perfect, it just looks and sounds good from the seller's perspective.
I just did a massive amount of research on this, some of which I posted on another thread. Bottom line is that tubes do not have to be perfectly matched. For years I insisted that the phase inverter be matched. Now I find out it doesn't have to be. The author of this research paper did say that power tubes should be within 8 per cent of the highest to the lowest. This has to do with proper bias adjustment.
You wouldn't want a strong tube and a weak tube together and then try to bias it. It will bias, but the current flow will be way off on one tube and it will get hot. Take a Peavey amp with cathode bias. Peavey is assuming that you will replace the tubes and that they are somewhat of a close match.
Throwing in a wide set could cause some problems. Personally, when it comes to power tubes, I like a matched set, because it makes biasing so much easier to accomplish. Now as far as preamp tubes go, I'm not going to concern myself that much whether the tube is "close" or "wide.
In closing, I studied this research paper and I have to agree with it. There are so many other variables in an amp that are not balanced, that to insist all the tubes be is just plain nonsense. I think there is no harm nor do I think it is dumb behavior if you want to use matched tubes. I say, "Go for it! For safety's sake use a little common sense on the power tubes and make sure they are not real "wide.
Not a problem. Also, I see a lot of post where people are giving advice about swapping power tubes. A lot of the older Marshall that used "non-EL34 tubes" usually had lower plate voltages. This needs to be taken into consideration if EL34's are to be used.
Another more dangerous scenario is taking EL34's out and going with a tube that operates on a lower voltage. Get professional advice before doing a tube swap. EL34's are usually set at around V and they can take a lot more voltage than that. On the other hand a , 6L6 and KT66 cannot take that sort of punishment over a long period of time. A 6L6GC's maximum plate voltage is and you really wouldn't want to operate it like that, no manufacturer would.
So get some advice from your tech before swapping tubes. Find out what your actual plate voltage is and the bias range for the power tubes you plan on using. This will ensure a quick and easy installation and bias adjustment. This allows the valves to resist the power that is being supplied to them, resulting in a balanced tone, improved longevity, and minimal risk of damage. Preamp tubes are often overlooked when discussing the components of a valve amplifier, but in reality, they are equally as important as power tubes and any other inner components.
However, without preamp tubes, amplifiers simply would not be able to function. These devices are much smaller in size than power tubes, and their primary function is to shape the tonal output of the amplifier. They receive a signal from your guitar or another line-level instrument and then pre-amplify it. This signal is then sent to the power amp, which takes over the amplification process from there. If a preamp tube is overdriven, the result is a pleasant tone of saturation that is rich in harmonics.
The natural, authentic-sounding distortion that preamp tubes produce when they are pushed to their limits is highly sought after by guitarists. Valve amplifiers usually have dedicated effects units installed within them.
Famously, vintage Fender amplifiers often housed a spring reverb channel and a tremolo channel. These two effects are the most common. A solid-state amplifier uses transistor circuits that convert electrical signals into audio signals.
There are two stages of amplification with solid-state amps: firstly, the preamp stage, and secondly, the power amp stage. This depends entirely on how they have been used. Preamp tubes should be used until they no longer work.
It will be very noticeable when they have worn out, but this varies depending on the usage. What is amp bias? What will I learn? So why is Tube Amp Bias important? Run the valves at optimum — This is somewhere between hot and cool where the valves can perfectly resist the power coming at them.
Happy valves means happy tone and a very happy player. This is the balance between tube life, and ultimately, the best tone. Tube Amp Bias is like water through a tap If your perfect bias is a steady, smooth stream of water flowing from a tap, then having the amp incorrectly biased can drastically alter that flow. When does a tube amp need to be biased?
But you now want to change tube brand or spec… 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. Featured Products. Did you enjoy reading this article? The Tweed PRinceton is single-ended and cathode biased as well. All Tweeds through the schematics were cathode-biased.
Power tubes in all other Orange amplifiers should be biased by a qualified amp technician when they are replaced. Failure to bias power tubes can result in shortened tube life and damage to your amplifier. Improperly biased tubes can also effect your amplifiers tone. The circuit below is the output stage of the common Vox AC amplifier, which features a cathode-biased output stage: The plate voltage is set to match the factory schematic, which shows V.
Neither you nor a tech can adjust the bias on these amps. Many, many great amps, on the other hand, also carry the Class AB designation. The Vox AC30 is a guitar amplifier manufactured by Vox. It was introduced in to meet the growing demand for louder amplifiers. By using a high-frequency filter across the two signals, and making it adjustable, you cancel out the highs the more you turn it up. Now we have come to the AC30 power amp. The Vox AC30 is one of the classic tube guitar amplifiers that shaped the sound of popular music.
Introduced in by Vox, the original AC30 amp featured 30 watts of Class A power into a inch Goodman watt speaker. The basic idea with the Vox amPlug is that you simply plug it directly into your electric guitar, then plug in some headphones.
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