$19.95. The main circuit is based on Andy Zeug's "Anvil" preamp lead channel (which in turn is a modded take on the Soldano SLO), but I added a switchable gain stage with its own 3-band EQ (based on a Fender blackface tonestack) to give some pre-dirt boost and EQ shaping. Note! Add to Wish List. SIZE. "High Gain" isn't BS, there is an actual rating called "Mu" that correlates to gain in preamp tubes. This is my take on the "High Octane" amplifier project from the online amp building community at AXAT4.com (sub 84 for AT4). 4. This Soldano-like circuit uses any 12A_7s, with maximum gain achieved by fitting two 12AX7s. In this case though, "high" is 60, not 100. Mullard Ltd, established in 1920 takes pride in its reputation for manufacturing premium vacuum tubes . The high valued grid stoppers are common in high gain amps. #12. I thought some Parasound amps have gain control which would be quite helpful if experimenting with a tube pre. Product Details. I'd recommend a Ruby 12AX7AC5 HG or Amperex 12AX7 if you wanna go older. The gain is far too high for this amplifier's design. $549 $99 price drop. Dec 26, 2010. Good reliability and a great price. 12AU7 is used for this lowest medium-gain preamp tube in the US with its European variant known as ECC82. 5751 - Gain Factor 70. ECC83S High Gain. The tubes are a brand new JJ Teslas. Use V2a as another voltage gain stage and V2b as a cathodyne PI, and you can get pretty respectable preamp gain and still drive a pair of 6V6 or EL84 tubes with room to spare. Our Products: Preamp Tubes > ECC83S (12AX7) Price: $19.50. It works with 4 ECC83 JJ/Tesla tubes, channelswitching is done be relays. However gain isn't the only thing involved in getting 'breakup'. $18.95. Add to Cart. Two 12AX7 tubes are used in the high-gain preamp section of the circuit. A more modern type of circuit, the high-gain preamp has some elements in common with the traditional low-gain preamp, but it uses additional gain stages, meaning extra preamp tubes, beyond those needed for basic initial gain and EQ duties, purely to enable you to produce more distortion from this part of the amp. Re: Dual channel high gain preamp build hum and buzz issues. Brand: Electro-Harmonix. Preamp tubes take the small signal from your pickup and amplify it to "line level." As the signal passes through, preamp tubes influence the various EQ stages found in your amp, such as distortion, gain boost, tremolo and reverb. As tubes are high impedance devices, the tube preamps of the 50s and 60s needed input and output transformers to interface with low impedance microphones and studio equipment. Ruby 12AX7 JJ HG High Gain Preamp Tube 12AX7ACZ. Just contacted Dougs tubes as I saw he had the 9th gen chinese. modern Marshalls). Our high-gain tube preamp kit - Z-PRE - is based on London Power's Zen amplifier - a high-gain monster built for shredders and modern guitar soundsmiths.. Modern high-gain guitar sounds are easily produced with a pair of 12AX7 tubes in a cascaded four-stage preamp. As special feature this preamp is MIDI switchable, all channels and switches can be switched by a MIDI controller. An external power supply unit, providing 18 V of alternating current, is used to power the device. The Ruby 12AX7AC5 High Grade Plus tube is the Shuguang 12AX7 9th gen tube, but distributed by Magic Parts. How much will vary from tube to tube. JJ 12AX7A / ECC83 Preamp Tube. Ruby does not manufacture vacuum tubes, these are various branded tubes with Ruby's sticker on it which means its been hand selected from lots of tubes to meet the Ruby's desired specification and they are . ADDITIONAL FEATURES. These are handpicked for maximum gain on both triodes! TUBES. Sold out. Incorporate the VLD1 in your rig as a preamp, a pedal or by going direct. Single tube. FX AUDIO GE5654 Tube Preamplifier for Home Audio HiFi Stereo Vacuum Buffer Tube Preamp with Bass and Treble Control with RCA Input/Output 12V/1A Power Supply (Black) 9.4. Based on the schematic Im including Im looking for input values on what resistors and caps in the preamp Clean/Crunch would make this as high gain as possible. The Home of Tone®. Preamp tubes are generally not driven that hard and will usually last longer than the other tubes in the amplifier. 4.7 out of 5 stars. HIGH GRADE 12AU7 Tesla/JJ. However, in reality there are comparative gain differences among 12AX7s. Call the manufacturer of the preamp and ask if you can replace with a lower gain tube. Over this summer, I built a high-gain all-tube preamp using three 12ax7s. The best tube preamp is made on the basis of components of a very high class. The amp uses a single EL84 output tube to deliver 5 watts of Class-A power. All Magic Parts™ pre-amp tubes are properly tested for quality assuran.. $17.83. This means it has the most effect on the sonic quality. The gain produced by this pedal sounds natural, with ear-friendly harmonics which resemble a slightly cranked preamp section of a vintage tube amplifier. Click to expand. 06-11-2005, 01:07 AM. A 12AX7A that blends high gain and low microphonics. They provide the maximum level of high gain output with low sensitivity to microphonic noise while producing a balanced response across the tonal spectrum that is . The rest are pretty much fair game though, so have fun~! These tubes sound Very Good in Marshall Amplifiers. I suppose you could burn out a small signal tube's grid by persistant overdrive, but you won't want to listen to the result long enough for that to happen anyway. High Gain Preamp Tubes. $450. The radioactive sources of 55 Fe, 241 Am, and 137 Cs were adopted to measure the energy spectrum and energy resolution, and a collimated X-ray source was used for the measurement of uniformity. The 12AT7 (ECC81) is similar to the 12AX7 in that it has a high μ. Little Bear T7 Vacumn Tube Mini Phono Stage RIAA MM Turntable Preamp & HiFi Tube Pre-Amplifier (Black) 9.4. MESA® preamp tubes are among the highest quality available and selected for their exceptional full-range tonal quality, stability, low noise and low microphonics. Any of my search term words; All of my search term words The Birth of the High Gain Amplifier 2203 Master Volume 100 Watt, 2204 50 Watt and JCM800 Lead Series Preamp. The tubes I used were:-TAD 7025HG, Sovtek 12AX7, Mesa 12ax7-A, Electro Harmonix 12A. It basically means the tube is best suited for the most sensitive first gain V1 spots. No solid state tricks or clipping diodes. 5. 5. With that tube installed the amp is turned up to obtain the highest clean output possible. This means it has the most effect on the sonic quality. #2. Octal preamp tube, high output/gain, balanced with good clarity, great replacement for most older Fender® & Gibson® amps. Good tone, detailed highs and a rich bottom end. 230 ratings. keennay, Jan 5, 2015. The test starts using the highest gain pre-amp, the 12AX7. A 12AT7 has a mu of around 60, and a 12AX7 has a mu of 100. The two selected high gain ECC83S tubes are optimized for the preamp stage of Fender amplifiers of all eras which use a 12AX7/7025 first gain stage. The VLD1's tube technology with simple, yet comprehensive and modern features delivers the sound of Steve Vai's Legacy amplifier in a preamp pedal. Therefore I tried to build a high gain preamp, based on a fam… I like the shuguang ninth gen chinese tubes too. An Ultra Low Wattage, High Gain Tube Amplifier: For bedroom rockers like me, there is nothing worse than noise complaints. Add to Compare. If you want or like the "fuzz" then seek out the russian and chinese tubes. This tube has been a favorite of many professional . Bremerton, WA. They aren't a different design with a higher gain. $1,099. Quote. Output Tubes 2 x EL34 Preamp Tubes Channel 1: 1 x 12AX7, Channel 2: 1 x 12AX7 Rectifier: SS Rectifier. Tung-Sol 12AU7 ECC82 Dual Triode Tube. On the other hand, it is a shame to have a 50W amplifier hooked to a load dissipating almost everything in heat. Most high gain tube based amplifiers have two to four preamp tubes--and all of them are usually the ubiquitous 12AX7--but the HT1R only lists two tubes with very different impedances and gain ratings, which could be responsible for a lack of gain in the circuit. #ksramps #ksrvesta #effectspedals #guitar #electricguitar Remember also that I have literally thousands of preamp, and some power tubes that are available to ONLY RavenHeads. RiverRatt, yladrd61 and Kris Ford like this. HG+ Grade: For use in high gain circuits. Ideally, every 12AX7 should yield the same gain when placed in the same circuit. ECC83S High Gain. This high gain tube guitar Preamp is 3-channel guitar preamp, full tube. Create your own Legacy with the VLD1 Legacy DRIVE tube pedal. It also means noise from the tube - both white electric and mechanical - will be more noticeable. Early transistor preamps of the late 60s and early 70s still relied on transformers for signal balancing. The Mullard 12AX7 preamp vacuum tube is a superlative high-gain twin triode optimal for use in hi-fi amps. HG+ has extremely low microphonics and intended for use in the first stage of high gain amps. High Gain Preamp Tubes. You'll note that they don't indicate what the gain is, just that it is higher. Without changing any controls, pre-amp tubes are substituted one at a time while the changes in amplifier output are observed. 9 pin miniature preamp tube (Amplification Factor = 100). 4. ~ Rod . Here is a preamp tube shootout. 100% pure tube gain. I wanted to start with a high gain preamp that will cover Dream Theater grounds, so I started off with Soldano SLO 100 design. by Ruby. Some high gain amplifiers drive these tubes harder than vintage amplifiers, so they may need to be replaced more often. 12AX7 Comparison of Current Made Tubes. If you want or like the "fuzz" then seek out the russian and chinese tubes. Sound great in high gain amps. Preamp tubes are generally not driven that hard and will usually last longer than the other tubes in the amplifier. The test amp was my extremely good sounding 50W Marshall Jubilee on Jubilee 4-12 w/Vin 30's and Tesla JJ E-34L's (10% higher output than EL-34's) I actually lined up my whole collection . You may want clean, compressed, distorted or some combination. | 25 answered questions. The gain factor of a tube simply measures how much it amplifies the input signal. In the case of the high gain tubes, these are tubes that fall on the high end of the bell curve. The ValveSonic series has been carefully designed to provide pristine tone, no matter what your style of performance. Factory pre-selected for closest tolerances and best performance. Tube Phono Preamp vs Regular While a tube phono amplifier utilizes vacuum tubes to enhance the power of output signals, a regular preamp has a set of transistors and operating amplifiers that do the same job. A 12AX7A that blends high-gain and low microphonics. Specially selected from premium Groove Tubes preamp tubes that have been tested to meet the GT standard. If you want high gain and a quieter, even softer tube sound, the 12AX7-B is your best bet. Who is this best suited for: Guitarists who prefer to keep things simple when it comes to assembling their pedalboard will love the easy-to-use design of the Xotic BB Preamp. All tubes were used at the input amplifier stage of the amp since this seems to be where most people develop their perceptions of how good a pre-amp . (Important: this only works for tubes that are pinout and plate voltage compatible.) A Chinese version of 6SN7 tube. In overdrive, it is not quite as defined as the 12AX7-S-JJ, but it offers more crunchy fizz. Used in this way, preamp tubes can produce a scorching, harmonically saturated lead tone . Logged. Check Price on Amazon. Even if the specs say no grid current, tubes are tougher than transistors and don't go FUBAR at the drop of an electron. Northcourt Thirty Tube Amplifier 60's British , EF86, EL34, GZ34. But just as important is voicing. The HOT MOD V2 EVO circuit was carefully designed to give you gradual increases of gain when using the amp's preamp control. This Russian tube is full bodied and well balanced. Thanks for the recommendation. It also means noise from the tube - both white electric and mechanical - will be more noticeable. im just lookin to kick up my sovtek with more distortion. "High grade +" is one of the labels in the measuring system used by Magic Parts. Check Price on Amazon. The tubes in the amp previously were marked "made in china" and were 12ax7R, which I think must be the same as the ax7s, do to their pretty high gain tendency. Ruby 6SN7GTC. If the amplifier starts to sound dull, lacking response and punch, it is a good indication that the tubes need . One of the most popular swaps, a 5751 will reduce the gain of your first preamp stage by around 30 percent, which can often be enough to tame a fizzy overdrive tone without sacrificing too much of the power and muscularity from the amp's overall sound. Preamp Tubes. »Preamp Tubes: Two 12AX7 (dual stage) »Controls: MASTER . On the other hand, it is a shame to have a 50W amplifier hooked to a load dissipating almost everything in heat. It is the tube that defines the sound of your amp in a big way. This means that the tube will simply have a bit more gain than their standard 83S. Great for adding a bit of edge and these tubes have great sustain. Find the schematic for a Soldano SLO-100 for a similar design. This tube from Tung-Sol is a perfect replacement for any 12AU7 or ECC82 circuit. I had to place a passive volume control between the pre and amp. Note! The high-gain and low-gain signals are transmitted through a multi-channel MCA8000A for data acquisition after formation by the main amplifier ORTEC671. Some modern high-gain amps are designed specifically to create extreme yet controllable preamp tube distortion by cascading multiple gain stages, with gain and master volume controls between each stage to control their individual drive levels. The high gain switch increases the power output on the unit and is best for recording with extremely low volume microphones, like ribbon mics. They affect the frequency response, stability, and yes throw away some excess gain. CONTROLS. We hand pick a lot of high gain preamp tubes for our customers who want and need lots of gain but also want the definition and the JJ ECC83S preamp tubes deliver with the hottest gain of any brand. Head Dimensions 20.75" Wide x 9.25" High x 10.5" Depth Weight: 52 lbs. « Reply #30 on: December 19, 2018, 09:25:33 am ». The first stage of guitar amps (often called V1) or audio amps usually amplifies the signal the most. Vision Guitar. Matchless used a paralleled tube tuned for max voltage gain in V1 of the Spitfire to get some nice breakup with minimal parts count, too. In other words, the most common preamp tubes can provide two gain stages. This sets the stage for the entire test. If the amplifier starts to sound dull, lacking response and punch, it is a good indication that the tubes need . It never hurts to have nice strong (higher gain tube) 12AX7 in each slot. If you are looking to upgrade the tubes in your amp, 12AX7 in V1 is where you want to . Tung-Sol 12AU7 ECC82 Dual Triode Tube. Help with Butcher 2 Preamp Mods to make a High Gain Monster. Pro-Ject Tube Box S can work with MM and MC-type heads (the necessary gain is selected using the appropriate switch). These are a very consistently made tube, sweet sounding, and very warm. We hand pick a lot of high gain preamp tubes for our customers who want and need lots of gain but also want the definition and the JJ ECC83S preamp tubes deliver with the hottest gain of any brand. A medium-gain dual/single triode with the lowest gain factor amongst all commonly used preamplifier tubes, the 12AU7 has several names for identical variants. I almost always run a coupe of each depending upon what I hear and where they work in the particular amp. Used - Good. Little Bear T7 Vacumn Tube Mini Phono Stage RIAA MM Turntable Preamp & HiFi Tube Pre-Amplifier (Black) 9.4. Nobsound NS-10P Mini Vacuum Tube Preamp Audio Hi-Fi Stereo Pre-Amplifier Treble & Bass Control Nobsound NS-10P Mini Vacuum Tube Preamp Audio Hi-Fi Stereo Pre-Amplifier Treble & Bass Control $49.99 in stock 3 used from $37.82 as of January 15, 2022 2:37 pm Check Price on Amazon Amazon.com Fosi Audio Box X2 Phono Preamp for Turntable. Our highest quality 12AX7A tube. The version 2 is a fairly tame 2 channel with moderate gain pre and post boost functions. HG is great for use in any stage of low and mid gain amps, and all but the first stage of high gain amps. Some tubes were clearly better suited in one application or usable in both. EH - good tube but all of the ones I have owned have crapped out at he most inopportune times Sovtek LPS - Great tube but high gain guys say long plate tube can cause problems, I've never had this happen. Add to Cart Details. Balanced triode sections. It has a high gain with a very smooth presentation. Your tube high-gain solution is here. One simple tweak that is favored by guitar amp users is to plug in a pre-amp tube with a slightly different gain factor. Measure Volts AC at each power supply tap, I would expect ~~ 2-4vac 1st tap, <20mV AC at last tap. Description. $1,299 $200 price drop. This amplifier uses the high gain 12AX7/ECC83 double triode vacuum tube for the preamp stage, and the 6L6GC beam power tube for the output stage in a single-ended Class-A design. I removed the tone stack, FX loop, clean channel and the power amp. Robust internal structure, well balanced sound. One of my tube pre's has a switch 1 x or 3 x gain https://ibb.co/ygM6WHt. Built to original 6189 specs, it can be useful as a driver or preamp tube. skunx said: Sovtek 12ax7 LPS is a great sounding tube. The Groove Tubes SAG-FHG Fender High Gain Kit includes two high gain preamp tubes and one matched 12AT7 phase inverter. All 12AX7 tubes have an amplification factor (μ) of 100 ("high-mu"). (That said, some more esoteric amp designs use an EF86, a pentode preamp tube popularized by vintage Vox AC15s and modern Matchless DC30s alike, and which has only one gain stage per tube but is capable of more gain than a 12AX7.) In most amp circuits, it is common for each stage to be controlled by one preamp tube. Electro-Harmonix 12AX7EH Preamp Vacuum Tube, Single. You can also use a conventional footswitch, to switch the 3 channels. Ultra low noise thanks to unique spiral filament which eliminates cathode-to-filament induced hum (common on amplifiers that use AC on the filaments) Best all-around choice & best value. The purpose of this comparison is simply to provide guitar players with a frame of . #9. Therefore I tried to build a high gain preamp, based on a fam… Add to Cart. Tube Stage. Also featured on the preamp is a high gain switch, a high pass filter, and phase reverse relay. If that happens, back off the gain. Great modern production replacement for any 6SL7 tube. Sovtek 5751 Tube. I usually like a mix. Tesla ECC83 - Good gain, quiet, best tube for drier sounding high gain amps (i.e. Class-A amps are voltage amplifiers. All SAG kits are selected on a limited basis. But if you want a gain monster for an amplifier and are not worried about noise, the 12AX7-A is your animal. Removing the clean channel left me with a spare triode in the first tube. 12AX7 tube is a high gain dual triode tube found in many tube amps. Because of the extremely high demand for these tubes and the fact that we only get a certain . Better suited for audio amps. This allows the high power, high gain crowd and the more conservative players to get the fairest evaluation possible. Genalex Gold Lion 12AX7 Preamp Tube. #12. Preamp Tube Gain Factor Choosing pre-amp tubes by gain factor. Shootout Results. I have a unmodified 3120 and after . It will overdrive the preamp section going into the power amp and cause distortion. Super-Premium gold pins high-gain twin triode, faithfully reissued from the original Genalex Gold Lion ECC83/B75. 120hz. The issue with 6 stages of gain can be hum, noise and microphonics. Two dual cascading vacuum tubes power the circuitry and are what give the VT-737SP its warmth and power. All Magic Parts™ rectifier tubes are properly tested for quality .. The ValveSonic also features HIGH CUT control to adjust the High Frequency cut in order to roll off some of the high end "sizzle" when the high gain is used. Introduced in 1974, the "Master Volume Lead" series amps were Marshall's first true high gain amplifiers.They cascaded the Plexi's bright channel into the normal channel, added a pre-phase inverter master volume and cold biased "cold clipper" gain stage and tweaked the resulting . Because of the high gain, the 12AX7 tube is often used in the V1 position of guitar amps, which has a lot of effect on sonics. I picked the JJ's at the recommendation of the Jet City's product support guy, and based on some positive feedback from fellow musicians. I have built a 6 stage high gain preamp for screaming lead guitar. Sovtek 12AX7WXT - Better, quieter still, but more $$. The 12AT7 has a maximum plate dissipation of 2.5 W, compared to 1.2 W for the 12AX7. An Ultra Low Wattage, High Gain Tube Amplifier: For bedroom rockers like me, there is nothing worse than noise complaints. Channel 1: Volume, Tone Channel 2: Gain, Edge, Bass, Mid, Mid Boost, Treble, Master Global Presence for both channels. Demo of the KSR Vesta vintage high gain style preamp. Revv Amplification G20 - High Gain 20 Watt Tube Head with Two Notes Torpedo. Like Ken said your amplifier is high gain and is setup to provide high gain no matter what brand or model 12AX7 preamp tube you use in its slots. Sovtek 12AX7WB - Darker than the WA, better gain. Special Order : Sovtek 6SN7 - $13.95 each so filaments are out, and PS, or inductive coupling from the PS are in. The Groove Tubes SAG-MHG Marshall High Gain Kit contains 2 SAG ECC83S and 1 AX7-MPI tubes optimized for the preamp stage of Marshall-style amplifiers. Changing a higher gain tube for a lower gain tube won't do much, you need to change the feedback loop components to reduce the gain, a job for a good tube tech. ••• V1 is the start of your chain, so that's where you'd want your highest gain preamp tube. High gain metal riffs using a Randall T2. Likes Received: 2,326. The first stage of guitar amps (often called V1) or audio amps usually amplifies the signal the most. FX AUDIO GE5654 Tube Preamplifier for Home Audio HiFi Stereo Vacuum Buffer Tube Preamp with Bass and Treble Control with RCA Input/Output 12V/1A Power Supply (Black) 9.4. HG Grade: RUBY standard grade that will work in all positions in an amplifier except in very high gain circuits, usually the first gain stage in a combo amplifier. In a Class-A amplifier the output voltage's wave shape is the same with the shape of the signal voltage applied to the grid. Tonight, I did a preamp tube shootout, just to see what pre tubes are the KING of high gain. New Demo Unit! Breakup happens when your gain hits the wall of headroom. A tube amplifier, also known as a valve amplifier, utilizes vacuum tubes which enhance the audio signals' amplitude.
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