the driver tubes with a marking pen 1,2 and three, noting there positions on the board. If all three are the same tube start here. Check out dougstubes.com for a nice selection of various pre amp tubes. What tubes would you suggest for upgrading the ones on this unit? I know that the 12AX7 can be changed for other tubes such as AY7/AT7/AU7, etc. I'm wanting to replace the tubes I currently have in my Marshall TSL60 but want a different tone. It plays the most important role in shaping the distortion characteristics, it influences the interaction between the tube and the circuit built . Afterwards we swapped the stock Bugera EL84 and 12AX7 tubes with Electro-Harmonix tubes in his Bugera V5. Preamp tubes can be replaced, but be aware that different tubes draw different current. Harp (harmonica) players may get a kick out of using a 12DW7, also known as an ECC832, in V3. Rest assured, this is no cause for alarm and you can take care of the problem yourself in a matter of minutes by simply swapping tubes. It drives the output tubes unequally, which causes distortion pretty much all the time. That could be due to the particular tubes that are being swapped out, or the preamp circuit design, or a combination of both. Here's my question: 2. The kit is """6J1 tube preamp amplifier board Pre-amp Headphone amp 6J1 valve preamp bile buffer diy kits + shell""". Posted by 4 years ago. Re-tube your McIntosh C2500 Preamp with our specially selected vacuum tube sets. Hi guys, I think one of my preamp tubes might have failed so I'm going to have to replace them. It's for stereos, not guitars. If you had an amp that is using a 12AT7, 12AY7 or 12AU7 and it doesn't . « Reply #2 on: January 13, 2022, 07:28:17 am ». Carefully extract the tube by gently rocking it back and forth and pulling upwards. That's a 40w amp and it will always be able to play that loud. That was a 5Z3P --> 274B swap. I estimate that the previous tubes have about 1500-2000 hours of power running through them. Can I swap out the preamp tubes without damaging anything? With power tubes, you can swap different brands of the same tube. Re: Preamp Tubes for High Gain. Joined: Oct 2, 2010 Messages: 278 Likes Received: 32 Location: United States. That's true foe line pres and power anps as well. by Ronnie Robinson » Wed Jan 14, 2015 9:39 pm. I usually buy a few tubes and spend an hour or two swapping them in and out to see what sounds best. 2021-01-05 6:57 am. It comes stock with a 12AY7 for the preamp tube and 12AU7 for the output driver tube. Preamp tubes can be replaced, but be aware that different tubes draw different current. Yum!). Cheers! (For example, 6L6 tubes from different manufacturers.) In terms of tube phono pres, the lowest noise you can get out of a phono pre is mostly bounded by the cartridge's own thermal noise, but yes, on average, a tube phono pre is likely to.have higher seld noise thatna decent or better solid state one. While I can already get a nice clean sound for bebop/mainstream jazz sounds; I was wondering if I could get even more of a warm clean sound. You'll often hear amp nerds talk of tweaking their tube amps to the nth degree by swapping out preamp tubes to tailor gain, frequency response, overall sonic character and other factors. Swapping the first preamp tube is an easy way to change the tone and feel of an amp. Replacing or Swapping Tubes Saga accommodates any 6SN7, 6N8S or 5692 tube type. Unlike tube phono preamps, once you buy a solid-state phono preamp, there's not much else that can be done in the way of improving sound quality from it. If the dead channel moves to the other channel, it's not your power amp. If the amp is not . If noting changes then you need to rule out the center gain tube. Discussion in 'The Workbench' started by khan, Apr 7, 2014. khan Active Member. Preamp tubes do not need to be matched imo. Interested in the ULTIMATE course for Reaper? Also a trick for re. Having given that disclaimer and warning, here are a few guidelines: You should be able to swap preamp tubes of the same type without problem. I might also just swap the M out altogether and see what I hear. 40w is full rock and roll . The good news is that preamp tubes can be swapped without causing any problem in the amp. The gain is far too high for this amplifier's design. Let's roll them in and see if they make a difference. For example, any 12AX7 should be compatible with another 12AX7. So, my 800 has an extra preamp tube (got it that way) and gets dirty really fast. From what i can tell, this tends to minimize the differences between the tube types. Here's what I'm working with right now- 32-bit 3200+ amd pc running xp Sonic Foundry Acid 6.0 M-Audio fasttrack USB interface ART MP studio preamp Logitech 2.1 speaker system MXL condenser and Blue Encore 200 mic (oh man . #3. swapping preamp tubes Discussion in 'Glowing Bottle Tube Amp Forum' started by popthree, Jan 25, 2021. It will overdrive the preamp section going into the power amp and cause distortion. Where every little thing is covered? The 12AX7. I love the 5150 for the high-gain channel, but would kill to have a more clean clean channel, and so I was wondering if there was a possible way to swap a tube that would affect the clean channel but not the high-gain. This is because 99% of tube testers are incapable of testing tubes at the actual voltages and currents to which they are subjected in the context of a working circuit. The 12ay7 tames the gain while still leaving plenty on tap (more than enough in my opinion). Close. The rectifier tube upgrade made the most significant improvement. Both tubes are darker than the stock 12AX7. Now I have a NOS GE JAN 12ay7 preamp tube in V2, which has made the biggest difference of all with regards to my tube swapping, which isn't a surprise. Swapping Tubes in the Blackbird by Phil Taylor The Blackbird's all-tube circuitry has been specially designed to function with a variety of different tube types (12AX7, 12AY7, etc) allowing guitarists to tailor the pedal to their own specific playing style and fine-tune their guitar tone to the absolute nth degree. My "guitar amp" is an ion block rocker which has a mic input and an . Not even sure how to describe it but to say the sound is much more defined and clearer now. Posted January 23, 2011. Just remember I am in Texas. In this video, we walk through the steps for swapping out the power and preamp tubes (Ruby) for some Tung Sol tubes on the Peavey 6505+. I heard SRV just swapped preamp tube #2 to drive the amp differently (and cleaner) but that it only would affect the clean tone. gain is thick, creamy and articulate. We will take a look at why you might, or might not, want to swap out these different types of tubes. Joined: Jan 25, 2005 Location: a hawk makin lazy circles. This is a hybrid tube that has the gain of a 12AX7 on one side and the gain of a 12AU7 on the other. Post. Now, depending on your guitar pickups, the higher gain . Swap the interconnects going between your preamp and power amp left to right at the preamp only. My number is: 936-662-5100. The 12AX7 is by far the best-known preamp tube among guitar . For example, any 12AX7 should be compatible with another 12AX7. Check out our course here:- http://hoppole.co/reaperBuy 12AX7 tubes from T. Seattle Area. You can hear how the gain content decreases with each . EHX.com | 12AY7 Mic Pre - Class A Tube Microphone Preamp | Electro-Harmonix It already sounds good but I'm wondering if it could be even better with a tube swap. The 6AU6 is a seven-pin miniature tube having a transconductance of 5,200 microsiemens (μS) when used with a 150-V plate supply. Yes, you can use an AU7 in your amp for the last preamp driver (although the preamp gain will be less that if a 12AX7 triode was in that stage). 2. Owner was kind enough to also send me a pair of matched 6N3P-E matched vintage NOS Russian tubes bought from Amazon which cost US $47.50. You can hear how the gain content decreases with each . chervokas, Dec 5, 2021. An excellent old-timer for audio preamps is the 6AU6 and its 3-, 4-, and 12-V cousins the 3AU6, the 4AU6, and the 12AU6. The swap yielded noticeable improvements in high end sparkle and low end thump ( sorry . Right now I have a GT12AX7M Mullard reissue in V1, and Shuguang 9th gens in V2-V4. But when the amp is good and loud it's freaking decent I think, you just gotta balance the preamp and power amp. For the PA stage, you will need to increase the cathode resistor for an AU7 triode to something between 4k7 and 6k8. A number of experts have recommended a lower gain rated preamp tube would do the trick so I grabbed a TungSol 5751. Preamp tubes for ART Pro Channel preamp : Hey guys, I'm relatively new to the forum. To lower the gain of a preamp stage a little, you can swap a 5751 into any socket that carries a 12AX7. #1. The swap made a really big improvement in sound. I asked the original owner if he had ever re-tubed. Con: Digital Sound While a solid-state phono preamp is a digital device, the way that transistors amplify sound can mimic that of digitalized gain enhancement which can add in good sounding . Hi guys! swapping preamp tubes on jcm800. among the collection i have a handful of varied 12ax7a preamp tubes. 3. His answer was no. V1 makes the most difference in tone/gain, so really swap that one out with several different types. The Gain Range: Four Levels of Hot-to-Cool Tube Types. To that end, let's consider what four compatible nine-pin, dual-triode preamp tube types can bring to the table as regards the gain-making potential of your first preamp-tube slot, and how swapping one for the other can noticeably alter your amp's performance. I just purchased a used Access Tube pre-amp (used of course). Chinese, Tung Sol Reissue, JJ and Sovtek are some of the most common types. Fender Super Champ X2: Tube Swapping. huge difference between it and the stock tube. Additionally, swapping cartridges means no fussing about with patch cables and signal routing. Wait a while for the tube to cool. It's fun and easy. Any tricks to slide off the metal casing that covers the tube? With power tubes, you can swap different brands of the same tube. I want to get better at recording, so I'm focusing on adding gear to round out my studio. Dec 27, 2016. THe inputs are rca. If you have a question about preamp tubes, you can ALWAYS call me, any day any time. Also a trick for re. For instance, the JJ sets to a lower hardness than the Sylvania (I think 7.0 for the JJ and 8.4 for the Sylv). You may notice more midrange from a higher gain tube. The first four clips demonstrate swapping V1 (the first preamp tube) in a Fender '62 Princeton Chris Stapleton Edition (a reissue of the brownface Princeton 6G2 circuit) from the original 12AX7 (Clip 1) to progressively lower-gain tubes: a 5751 (Clip 2), 12AT7 (Clip 3), and 12AY7 (Clip 4). I just ordered a tube preamp kit from aliexpress,, you can find them on ebay as well. Post by caldurham » Fri Jun 30, 2017 11:50 pm i've tried a few different tubes in my micro dark. An extreme case of this behavior is the way certain 12AX7 tubes operate in preamp circuits. 6SL7s also work, but have higher distortion and higher output impedance. Diagnosing Pre-Amp Tube Problems: With an all tube amp design, it is quite possible that at some point you will experience minor pre-amp tube noise. 6N3P-E Tube Measurements. So if you adjust the hardness you can see more difference between the . I recently reviewed the Nobsound Douk 6N3 tube preamp. The trouble is, it's difficult . Re: Orange Micro Dark - is worth to swap preamp tube? by way of an estate sale i came into a box of old tubes. (For example, 6L6 tubes from different manufacturers.) The first four clips demonstrate swapping V1 (the first preamp tube) in a Fender '62 Princeton Chris Stapleton Edition (a reissue of the brownface Princeton 6G2 circuit) from the original 12AX7 (Clip 1) to progressively lower-gain tubes: a 5751 (Clip 2), 12AT7 (Clip 3), and 12AY7 (Clip 4). 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 . For some people that means the amp is "quieter" now but you've literally changed nothing except a number on a faceplate. For a lot of the amps we use, this can have a pretty big effect on the tone that comes out. Posts: 7,061. Marshall preamp tube swap? It's not too unusual to find a situation where a certain Tungsram 12AX7 for instance, works well in the phono stage of a particular preamp, but a certain smooth plate Telefunken does not; causing the gain to fall 10dB and the distortion to increase 10 . The only real rule is: NEVER USE A 12AX7 TUBE in any row. I've been toying around with the idea of trying different preamp tubes to . Try a lower/mid gain tube such as a Chinese one by Shuguang or a higher gain tube from Russian by Electro-Harmonix to determine what fits your style. The starting point on the PrimaLuna Dialogue, my second tube pre-amp, was already pretty high - so one has to work that much harder to squeeze out a performance improvement. I think it's best to get a matched pair of power tubes this will ensure the valves are working efficiently together, will probably last longer and the amp will sound at its best. I just love it and find it to be a awesome sounding pre-amp with all the features I had with a modern "modeler" which is saying a lot for a pre-amp that is over 20 years old. 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. Plate voltages of around 300V are also covered in order to cook up those tubes. A 12AT7 while lower gain than 12AX7 can draw more current. The thing is, I usually swap preamp tubes immediately after getting a new or used amp. . I was at a fiend's house yesterday for lunch (delicious Italian stuffed peppers with ground beef, sausage and mozzarella. Carefully insert the replacement . That's all a preamp tube swap will get you - the amp will be just as loud as before but the number it says on the knob will be higher. I love the peavey 6505+ amp but don't have the money to buy one. Re: Swapping 12AX7 with 12AU7. Counter-intuitive though it might sound, armed with the above knowledge regarding preamp tube distortion, many players have learned to create a bigger tone by using lower gain preamp tubes. Jan 25, 2021 #1. popthree Poster Extraordinaire. This makes it possible to power all-tube preamp modules which the API system wouldn't handle. Granted changing power tube types requires modification in several types of amps But this thing just sounds so amazing, that I wonder if it could be, that the preamp tubes are still usable after over 20 years. Key word is "some." I think there are many scenarios where tube rolling doesn't seem to make much difference in tone. Dec 6, 2021. Watch the preamp hardness change as you swap the tube types. If the amp is not . I'm aware that the stock tubes are Chinese made and don't sound very good. i finally settled on a genalex gold lion ecc83/b759 with gold pins. A 12AT7 while lower gain than 12AX7 can draw more current. Haroldo, ccouch7, mexicanyella and 1 other person like this. I don't mind spending the extra money on a quality preamp like a Univesal Audio 610 Solo (preferably tube since I'm looking to get a warm, vintage feel to my recordings), but a rather cheap preamp called the Art Tube MP II caught my eye. Never done it before so any help is welcome. So, I've been preamp tube swapping with my various amps a lot, which apparently is now called "tube rolling". Preamp tubes of different gain factors should make a big difference. Use whatever sounds best for you. Swapping preamp tubes in Peavey 6505MH. As someone who got into the tube game long after the big stocks of surplus tubes dried up, I am limited mostly to the current production tubes. For me, there really is a tone difference with * SOME * tube swap-outs in * SOME * preamps. The effects of such thoughtful tweaks reach beyond the realm of tone into the world of gain and headroom. I have a Super Champ X2 tube amp with a 12AX7 preamp tube plus two 6v6 tubes. This is true unless your talking about changing tube types, IE EL34 vs 6L6/5881 vs KT66 or swapping preamp tube types, IE 5751 vs 12ax7. The Gain Range: Four Levels of Hot-to-Cool Tube Types.
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