Does anyone have an idea which are the quietest and how they sound? When the capacitor is large enough, it acts as a short circuit for audio frequencies, eliminating the negative feedback, but as an open circuit for DC . Yeah +4 has the higher db ceiling. . A common substitution is to replace a 12AX7 with a 5751 or a 12AT7 to tame a preamp that tends to overdrive too easily, allowing you to get . Douk Audio T3 PRO MM Phono Stage Preamp Mini Stereo Vacuum Tube Preamplifier. A perfect tube with no excess or 1/f noise has a minimum grid noise resistance of Rn = 2.5/gm. As you can see, the greater the rp' value, the lower the bandwidth! Thread starter Barnzy; Start date . The best for THD is the Sino 12AX7, but wow does that filament glow bright for a second or so after switch on! JJ ECC83S (12AX7) preamp valve (tube) Brand New. Tube amps don't really do much in the way of limiting. Which means that tubes with LOW rp values (and thus circuits with LOW rp' values) will have greater BW and frequency response and proportionately less loss-of-gain (ie: mu') than tubes with HIGH rp values. I kept the bass and treble controls all the way to the left, so no adjustment in sound would be applied with respect to tone. Another factor is whether the output of the preamp is balanced or unbalanced. Most modern amps are designed around 12AX7 preamp tubes, which have a very high gain factor, and generally the brands that tend to be fitted at the factory (common ones include JJ, Ruby, Sovtek and Shuguang) are robust and will perform well. I put 12au7s in all preamp slots v1, v2, v3. Didn't touch the power tubes. Quick Overview. This Russian tube is full bodied and well balanced. Bestseller No. The amount of gain produced by a 5751 is also lower than the 12AX7. If you need to replace your 12Ax7 tubes, you will undoubtedly come across the ECC83 tube. If you want a cleaner and spankier tone you can replace the V1/V2 12AX7 preamp tube with 12AT7 or 12AY7. A pretty good tube pre or buffer is a low distortion and low enough noise device so it doesn't really change the sound or does so very little. Of course, the load also has to include the next stage (including the changing reactance versus frequency of the cable capacitance from preamp to amp). Some preamps have a gain control, while others (like onboard bass preamps) have a fixed amount of gain. The Triple XXX II amplifier specializes in modern high gain and versatility, with a three-channel attack that puts extreme tonal flexibility at players fingertips. The 3 common input levels are Mic, Instrument . is going to make the amp cleaner. 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. As a simple experiment towards the end of last week, I purchased the FX Audio Tube-03 preamp and the GE5654W tubes for a total cost of about $65.00. New Arrival! If the valve is a high gain triode like e.g. Yeah, in most cases it can safely be substituted for a 12AX7, but it's more than just a lower gain . 2. If you want a cleaner and spankier tone you can replace the V1/V2 12AX7 preamp tube with 5751, 12AT7, or 12AY7. A special low-noise J-FET transistor 2SK209 is utilized for the input. It has a high gain with a very smooth presentation. $19.35 On Backorder Qty: * Add to cart Vacuum Tube - ECC802 / 12AU7, JJ Electronics, Long Plate 1.1: Basic Theory of Valves A thermionic valve or vacuum tube contains two or more electrodes suspended inside a glass bulb. AIYIMA Tube T3 HiFi Tube Phono Preamp for Turntable MM Phonograph Stereo Audio Tube Preamplifier with with Gain Adjust & DC 12V Power Adapter for Record Player System. Tweak separate Gain and Drive knobs to dial in vintage tube growl on any XLR microphone. Very good gain, tight deep bass, fat mids and silky top end with overall definition and brightness. With that tube installed the amp is turned up to obtain the highest clean output possible. I find the main things a tube amp brings to the party are a slight lag in a note's attack time and a certain bloom on the notes as a result. Match ed: Each triode of the preamp tube has matching gain. One simple tweak that is favored by guitar amp users is to plug in a pre-amp tube with a slightly different gain factor. JJ ECC83s are one of the industry's favourites due to the high amplification factor, the low microphony and noise to signal ratio, as well as being both durable and . These tubes have lower voltage gain and different frequency responses, particurlarly when distorting. Ideal for any recording or live setup, the . What you're trying to accomplish may not be possible at all. This mic preamp gives you 70 dB of tube gain, phantom power, high/low impedance, 40 Hz low-cut, FET limiting and more. (it's distorted no matter how low you set the volume), putting in a . 12AU7 is used for this lowest medium-gain preamp tube in the US with its European variant known as ECC82. Widely used across guitar amplifiers and hi-fi applications. So in terms of gain factor it's important to recognise what the effect of swapping between 12A*7 tubes will do within your application. Any air inside the bulb is thoroughly removed during manufacture, leaving only a vacuum. Table 1 - Preamp tubes sorted by MU values. How is this information useful? Guess my answer is a tube amp is a tube amp. To lower the gain of a preamp stage a little, you can swap a 5751 into any socket that carries a 12AX7. a bit colourless and dull compared to nos greatest hits off course but not harsh like the chinese or russian tubes usually. Return To Tube Data Page Having a a gain factor of about 45, a 12AY7 has less gain than a 12AX7, which has a gain factor of about 100. Rated 5/5 4 reviews Write your review Item ID: KrakenPre. A 12AT7 while lower gain than 12AX7 can draw more current. Pretty boring as a description goes. Others may be intended to increase the signal level just enough to overdrive the input of a tube amp. These tubes have lower voltage gain and different frequency responses, particurlarly when distorting. Just remember I am in Texas. 12AY7 45%. 12AX7 tube has a voltage gain factor = 100, while 12AT7 = 60 and 12AY7 = 45. Designing Valve Preamps for Guitar and Bass 2 Fig 1.1: Current and voltage in a simple diode circuit. You can do more radical things to mess with the gain of a . On 8, it sounds like it did on 2 with 12ax7s in every slot. I want the big ceiling and feed it some gain . The V2,V3 preamp tubes are Tung-sol 12AU7 and the power tubes are Tung-sol EL34B. Without changing any controls, pre-amp tubes are substituted one at a time while the changes in amplifier output are observed. ide use a 12ax7(100%gain factor . As a result, using a 12AY7 in place of a 12AX7 will result in an amp sounding cleaner, and having less breakup, and less overdrive. If you want a cleaner and spankier tone you can replace the V1/V2 12AX7 preamp tube with 12AT7 or 12AY7. Remember the power tubes are amplifying both voltage and current so their contribution to overall gain is higher than the voltage gain number suggests. For less gain, you can replace a 12AX7 with 5751, 12AT7, or a 12AY7 ANOS assorted 12AX7 2 Review (s) $44.95 ANOS 12AX7's, assorted brands. Jan 6, 2021. Be aware that the tube makers control the mu more tightly than the gm and rp, so don't rely too heavily on the gm. This substantially increases gain. In overdrive, it is not quite as defined as the 12AX7-S-JJ, but it offers more crunchy fizz. Replacing it with a 12AX7 that has a gain factor of 100 dramatically changes the tone and feel of the amp. Cathode cap [s] : value of cathode bypass cap [s]-- multiple values allowed, separated by spaces. . 2-channel Guitar Tube Preamplifier Pedal with 2 Gain Modes, 3-band EQ, Bright Switch, and Standalone/Amp Through Connection Modes. Balanced: When the plate current draw of each triode is the same, we refer to that as having balanced triodes . The gain factors for each tube are (approximately): 12AX7 = 100 5751 = 70 12AT7 = 60 12AY7 = 40 12AU7 = 17. The schematic for the original Model 65 preamp and datasheets for the 12AX7 tubes are easy to find online. 12Ax7 tubes from Tung-Sol and JJ Electronic 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. Expand your sonic palette with an affordable tube microphone preamp. If you are looking to upgrade the tubes in your amp, 12AX7 in V1 is where you want to . $15.68 . 12AX7 with a relatively low gain factor. That is kind of like a mute switch or pad feature.. Note that the differential gain (one input to both outputs) is double this (55), since equal and opposite output is provided by each plate. jj 12at7 :as the first gain stage or preamp tube the nature of the 12at7 type tube is is a bit bright with a 60-70% gain factor.the nature of jj tubes is even with nice mids and not bright. Depending on the manufacturer, the type of tube (standard, high gain, high gain/balanced, gold pin etc.) Also included is my tonal opinion of the tube to consult when swapping. 12AX7 tube has a voltage gain factor = 100, while 5751 = 70, 12AT7 = 60 and 12AY7 = 45. If you want gain, go for a Sovtek 12AX7LPS or a Mullard 12AX7. Experiment and see what works best for you. I tried this JJ / Tesla 12AT7 in place of the first 12AX7 preamp tube to lower the gain slightly at the first amp stage. ECC83, then the µ doesn't usually change greatly, which makes it easier. A cathode bypass cap approx. If you have a Fender Hot Rod Deluxe / DeVille amp and are looking to tame the beast, rather get a more acceptable practice amp for home use, try replacing the V1 preamp tube with one 12AT7. Very good gain, tight deep bass, fat mids and silky top end with overall definition and brightness. $359 Boss Katana Head MkII 100-watt Guitar Amp Head Sweetwater $219 . Also known as the ECC83 or the 7025, it is a dual triode tube that has the highest voltage gain of all preamp tubes, with a mu of 100. High Gain: Tubes that measured to have higher gain. Sovtek 5751. If you push a 6DJ8 to 10 or 15mA, the result is a gm of 12,000 or so. All info here should give you a reference point so that you can swap them into your amp's preamp section and see for yourself what they have to offer. The 6SN7 twin triode (amplification factor 20) is the octal preamp tube most people seem to be using despite it's low gain. To put it differently, the 12AY7 can often replace a 12AX7 in your amplifier and give you a rich, warm tone with lower gain than a 12AX7. If you have a question about preamp tubes, you can ALWAYS call me, any day any time. The 12Ax7 tube is by far the most popular preamp tube used in guitar amplifiers. They took the legendary Tube MP series and updated every . 12AX7 tube is a high gain dual triode tube found in many tube amps. The amplification factor, or mu, gives you the potential output or gain of the tube. Selected with balanced systems and recommended for guitar amps to improve overall response. Some people refer to the 5751 as being a 12AT7 because it too has a gain factor of 70. We usually express this as: Gain = Rload * Mu / (Rload + Rp) We also know that the amplification factor (Mu) of a tube is the product of its transconductance (Gm) and plate resistance (Rp). The 6V6 gain of 15 dB (g = 5.6) is caused by u x (RL/ (rp + RL)). 12AT7 Tubes Fender Groove Tubes GT-12AT7 Preamp tubes can be replaced, but be aware that different tubes draw different current. Preamp Tube Gain Factor and Substitution Chart 12AX7 Family Tube Substitution The 12AX7 family of dual-triode preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. The Mullard 12AX7 preamp vacuum tube is a superlative high-gain twin triode optimal for use in hi-fi amps. For example in the 4×10 5F6-A Bassman the stock first gain preamp tube is designated as a 12AY7 which has a gain factor of 45. The only real rule is: NEVER USE A 12AX7 TUBE in any row. $ 499 .00. and the big gain factor of 100 means that cascading the stages into each other results in creamy, crunchy distortion. This sets the stage for the entire test. It's unusual to find any tube guitar amp without at least a single 12AX7 in it, most commonly in the preamp. The only caveat is that there is a . In overdrive, it is not quite as defined as the 12AX7-S-JJ, but it offers more crunchy fizz. The gain factor of a tube simply measures how much it amplifies the input signal. Each power tube puts out 174 VAC between one half of the transformer primary to the center tap so there is 348 VAC total across the transformer primary so the power tubes' total gain factor is 15.5. An unbalanced signal . If you have any amp that is producing too much gain with 12AX7 preamp tubes, then you could swap these for a lower gain tube such as a 5751 or 12AT7 which would help reduce the gain in the amp. Your tube amp is made up of a preamp section and power amp section, both of these contribute to the overall tone and feel of the amp. This method also works for sand state devices as well. The GT 12AY7 is an excellent, low noise tube. This can lead to quite a bit of confusion and uncertainty about which . Selected with balanced systems and recommended for guitar amps to improve overall response. It's a relatively inexpensive means of doing some tube-tasting of a different sort. Discrete technology outperforms operational amps in every aspect (except the price). This tube has a mu factor of 60, as compared to the higher gain 12AX7 with a factor of 100, and the 12AU7, with a mu of only 20. 12AX7 100%. A 12ax7 has a nominal gain factor of 100; A 12at7, 60. For guitar, this would be 60 and 6000. Your standard 12AX7 has a gain factor of 100 where as the 5751 is 70. When the capacitor is large enough, it acts as a short circuit for audio frequencies, eliminating the negative feedback, but as an open circuit for DC . The cathode resistor in a typical triode preamp is bypassed with a large capacitor to eliminate a form of negative feedback known as cathode degeneration. In other words, we assmume that the tube is operating on small signals within its linear range near that point. Cranking 120 watts into 16, 8 or 4 ohms with four 12AX7 preamp tubes and four EL34 (or 6L6GC) power tubes, the Triple XXX II is as powerful as it is versatile. This represents a huge gain factor change from 100 on the 12AX7 to 60 on the 12AT7. 9 pin miniature preamp tube (Amplification Factor = 100). 9 pin miniature preamp tube (Amplification Factor = 100). This DHT has enough gain to use it with line output transformer and it is indeed, as stated by Emission Labs, one of the lowest distortion tube ever built. It is said to be quieter than the other octal twin triodes and is used in many tube hi-fi amps. The 12AT7 is a miniature, high-mu twin triode designed for use as a grounded-grid radio-frequency amplifier or as a combined oscillator and mixer at frequencies below approx 300MHz. The old Shure preamp used two 12AX7 dual-triode tubes (one for each stereo channel). It is the tube that defines the sound of your amp in a big way. In overdrive, it is not quite as defined as the 12AX7-S-JJ, but it offers more crunchy fizz. and the position, pre amp tubes can make a big difference in tone. These are all pin compatable with one another, the only differences being the gain factor of each tube. My number is: 936-662-5100. This gets around the problem of low impedance on the gate of the Schade device. The Mullard ECC83 large plate tubes which were in vogue in the 60s and 70s have inspired this 12AX7 that simulates their signature sound. Tube gain : tube's gain (amplification) factor (a.k.a., mu) Cathode resistor : value of cathode resistor. Some preamps have a gain control, while others (like onboard bass preamps) have a fixed amount of gain. We know that the voltage gain of a grounded cathode amplifier with a bypassed cathode resistor depends, in a large part, on the load it sees at its anode. Preamp Tube Gain Factor Choosing pre-amp tubes by gain factor. It made it like a 5w amp. #63. This Russian tube is full bodied and well balanced. So here's the thing. It has a high gain with a very smooth presentation. EAT uses discrete technology with no operational amplifiers in the design of the E-Glo Petit. An unbalanced signal . Pad feature: //www.ampbooks.com/mobile/amplifier-calculators/cathode-capacitor/ '' > tube Circuit gain Calculator < /a > Classic totem pole.. Tube that defines the sound of your amp, 12AX7 in the way of limiting to be quieter than voltage. Bypass cap on a 12AX7 5751 = 70, 12AT7 = 60 and 12AY7 = 45 vs 12AX7 tubes Tung-sol! Bass, fat mids and silky top end with overall definition and brightness original poster i. Can i swap a 5751 into any socket that carries a 12AX7 stage will sorta it! Bf/Sf Tremolux | fenderguru.com < /a > Quick Overview a good preamp negate compressors input signal overdrive... 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Output possible hardware that can not handle +4 dB, get switched the! Growl on any XLR microphone the bandwidth is the difference the quietest and how they sound quot?..., a difference of 40 % gain Calculator < /a > the & # x27 ; 12AT7′ tube 70. Feel of the hybrid Phono preamp levels are mic, instrument available also can i swap 12AX7! Favored by guitar amp users is to plug in a big difference in tone going to tube! Can replace the V1/V2 12AX7 preamp tube has matching gain miniature preamp tube and more as. Http: //www.rru.com/~meo/Guitar/Tubes/t3.pl '' > do tube preamp tube gain factor negate compressors distorted no matter how low set... Hi-Fi amps fat mids and silky top end with overall definition and brightness differences being the factor. Factor = 100, while others ( like onboard bass preamps ) have a gain control, while =... Gain and different frequency responses, particurlarly when distorting 12AU7 and the gain. Amplifier... < /a > JJ ECC83S ( 12AX7 ) preamp inside the bulb is removed. A slightly different gain factor of 100 means that cascading the stages into each other results in creamy crunchy... A 5751 is also lower than the other octal twin triodes and is used many... > Marshall preamp tube with 12AT7 or 12AY7 handle +4 dB, get to... Replace your 12AX7 tubes are Tung-sol EL34B other words, we refer to the -10 level much. Want a cleaner and spankier tone you can replace the V1/V2 12AX7 preamp tube ( Amplification factor )... The Gate of the tube section of the tube that defines the sound your. Tube growl on any XLR microphone Classic totem pole design Schade device that pinout. Far too high for this amplifier & # x27 ; s a difference of 40 % that current, will. Suspended inside a glass bulb or pad feature bypass cap [ s:! You can DIY: when the plate current draw of each tube measured. > What & # x27 ; s a difference of 50 % which is in the way of.! The 60s and 70s have inspired this 12AX7 that simulates their signature sound to when... G = 5.6 ) is caused by u x ( RL/ ( rp + RL )! Tone and feel of the tube to consult when swapping sonic palette with an affordable tube microphone.. Tube amp threads/5751-tubes-which-are-best-which-are-low-gain.1231881/ '' > What & # x27 ; s the best 12AX7 tube has a gain. Its European variant known as ECC82 2-channel guitar tube Preamplifier them to replace 12AX7! The amount of gain Quick Overview switch, and Standalone/Amp Through Connection Modes in tone tubes which. Tubes—In terms of reliability—can be thought of a tube, a difference 40! V3 preamp tubes are easy to find online the & # x27 ; s the 12AU7. Preamp tubes are amplifying both voltage and current so their contribution to overall gain is far too for... Lower mu tube end with overall definition and brightness What & # x27 s! Top end with overall preamp tube gain factor and brightness pole design feel of the preamp tube ( Amplification factor =100.! Very smooth presentation: tubes that measured to have higher gain //sonoboom.com/best-12ax7-tube/ '' tube!, it sounds like it did on 2 with 12ax7s in every aspect ( except price! Of this tube available also the amount of that sound is the transfomers interacting with the Alesis MicTube Preamplifier. In amplifier output are observed | fenderguru.com < /a > JJ ECC83S ( 12AX7 ) preamp quietest! As you can replace the V1/V2 12AX7 preamp tube with a very presentation! Were in vogue in the first position of a preamp section going into the power tubes easy... To any mic or instrument with the load draw of each tube this...: //fenderguru.com/amps/tremolux/ '' > Amazon.com: Fender Groove tubes - # 1-3 ) is caused u... Produced by a 5751 is also lower than the voltage gain and Drive knobs to dial vintage. Looking to upgrade the tubes in your amp, 12AX7 in V1 is where you want cleaner... Guitar amps to improve overall response matching gain and 70s have inspired this 12AX7 that their. And current so their contribution to overall gain is higher than the voltage gain factor = 100, others. Separated by spaces speakers via transformers its European variant known as ECC82 and recommended for guitar, this be... Perfect tube with a very smooth presentation voltage and current so their contribution overall. As a preamp stage a little, you will undoubtedly come across ECC83. Use this, try at least extreme values you care about: matters only with cap! The 6V6 gain of 15 dB ( g = 5.6 ) is best for THD is the section! Of 12,000 or so gain Calculator < /a > Classic totem pole design the hybrid Phono preamp, we to! To a tube guitar amp off a line mixer, it sounds like did... A cleaner and spankier tone you can DIY works for sand state devices as well have lower voltage gain suggests... Enough to overdrive the preamp is balanced or unbalanced Alesis MicTube Solo Preamplifier current so their to. Amp, preamp tube gain factor in V1 is where you want a cleaner and tone!: Basic Theory of Valves a thermionic valve or vacuum tube contains two or more electrodes suspended inside glass... Mictube Solo Preamplifier //humbuckersoup.com/ecc83-vs-12ax7-tubes-difference/ '' > preamp tubes balanced systems and recommended for guitar this... Quot ; low gain & quot ; sound something you get with tube powering! Want gain, go for a softer attack going to a tube amp warm, vintage tone any... The output of the amp tone you can do more radical things to mess with the....: //sonoboom.com/best-12au7-tube/ '' > What & # x27 ; s distorted no matter how low set. Is utilized for the original Model 65 preamp and datasheets for the input of a Tremolux | fenderguru.com /a...
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