12ax7 cathode follower

Can't find any reference to 7119. cdn$269 ON SALE!!!! Since every portion of a typical linear power supply in a vacuum tube amplifier is coupled (in part) to the output, changes in any component in a power supply can often radically effect the resultant sound - rectifier tubes, power transformers, resistors, capacitors, and inductors all can and do effect the sound. A 12AX7 cathodyne phase inverter. Example 4: Determining the cathode resistor for self-bias. The Mullard cathode is perfectly round, with a thick, even coating (except where it got scratched removing the grid). A second gain stage consisting of one half of a 12AX7, leading to a 12AX7 cathode follower that drives a tone stack with independent treble and bass controls and local negative feedback. The Bassman cathode follower has according to the schematic, 215 Vollts on the cathode, minus your 6.3 heater, still leaves you in excess. This corresponds to a bias current of 0.75 mA. Some vacuum tube op amp manufacturers provided chopper-stabilizer "add-on" units. One final thought, the 12ax7 in v2 may not be the best choice for a cathode follower, since the 12ax7 is designed to be a high-gain voltage amplifier. There is grid current on the grid of the CF, which also affects the plate voltage of the cathode bias gain stage. but i see all these warnings about cathode followers. TUNG SOL 12AX7 reissue,EH 12AX7,SOVTEK 12AX7LPS,MULLARD 12AX7 reissue. Placing it at the "traditional" resistor to ground (R13) significantly clips the negative side of the signal. A low noise tube is not critical, however the heater-cathode insulation must be good quality. So, I'm working on step 1 of my plan outlined here to improve the sound of my Blackheart Killer Ant amplifier (2 x 12ax7 tubes, 1/4W, Class A) by replacing the 12ax7 "power" tube (V2) with a 12au7 for more clean headroom. Most of the New Sensor Tubes can only handle . . The 12AU7 contains non-linear triodes. Regular $383. The cathodyne phase inverter's total differential gain is slightly less than 2. . - Jsawyer09 08:27:58 09/09/19 (0) At the time it was made, were 12AX7s massively cheaper, or was the company too cheap to as a cathode follower? Post by JTM50 What are the ups and downs of running a 12ax7 (cathode follower, gain stage, I got rid of the clean option and added a very useful bright pot. Brimar 12AX7 says 250v. Chinese, JJ, Sovtek, Tung Sol RI, EH 12AX7's are not that expensive, and the ones you don't use become your backups. The Russian (Sovtek) tube is NOT reliable as a cathode follower. If you really need line stage gain, the linked PCB will work fine, with 12BH7 s populating the sockets. It's better than a 12AX7, but not as a good as a 12AT7. Master the basics Design your amp Know it works Amp Design for the 21st Century. The Shuguang 12AX7 that is sold under (Ruby, Penta Labs, etc), JJ 12AX7's and of course NOS tubes all can take the Cathode follower position. Preamps with 12AU7 cathode-followers aren't much better, sounding very "tubey," rolled-off, and old-fashioned. From the plate, the signal is now strong enough to drive the voltage doubling rectifier. The fourth stage is configured the same as the first but with just a slightly higher plate supply voltage, so it has approximately the same DC operating point: a DC plate-to-cathode voltage of 176V and a cathode-to . Half of the remaining 12AX7 dual triode was operated as a second gain stage, which in turn drove the remaining section as a cathode follower. Lloyd. Typically that tube swap is not a problem. The third tube is wired as a cathode follower buffer stage, which has no gain, and therefore substituting a 12AU7 in that spot won't affect the preamp gain. We say yes this kind of 12ax7 Cathode Follower graphic could possibly be the most trending topic behind we portion it in google gain or facebook. Its submitted by government in the best field. Despite its detractors, the 12AX7 is actually intrinsically very linear, even more so than the 6SN7 in the test I did. You will need double the heater current. The ECC83 (also known as the 12AX7) is the most commonly used preamp valve. 12AU7 has over twice the plate power (Ppd) capacity of a 12AX7, which makes IT excellent for cathode-follower operation (in addition to its much lower 7.7KΩ rp). Link to comment. Its lows demand attention when playing full bar chords. There's also a very good chance the 12AU7 cathode follower will sound better than the 12AX7, but of course that will depend on the particular tubes. Significant elements of this design were the 12AY7 first stage preamp, the 12AX7 cathode follower tone stack driver and long-tail phase inverter, the pair of 5881 fixed bias output tubes, the 5AR4 tube rectifier, and the four Jensen 10″ speakers in an open backed cabinet. NOS JAN 12AX7s are recommended for this position. The SVT's preamp uses the 12DW7 (half 12AX7, half 12AU7) with the "12AX7" side as a gain stage and the "12AU7" side as a cathode follower. The 5687 has more Gm than a 12AU7, but burns three times the heater current. The 12AX7WC has closely matched sections making it ideal for phase inverter circuits. And there's the 12ax7 cathode follower between the driver and output stages, direct coupled to the input grids and therefore having the -45V bias voltage on their cathodes. Spiral filament 12AX7 tubes have problems in cathode follower circuits due to the fact that most cathode follower circuits in guitar amplifiers exceed the maximum cathode to heater rating of 100 volts. So, the gain is 80 x 0.9 x 0.9 = 64.8 Without this cathode follower circuit, the tone control addition would have reduced both gain and sound quality and become a negative factor for this amp design. so im looking at getting a new sovtek 12ax7lp for my 5150 ii for the phase inverter. Grade 2 (higher than average microphonics) Not recommended for V1 but good for phase inverters, cathode followers, tremolo tubes, $25.00 Taxonomy upgrade extras: Catalog's Front Page Cheers, Ian ••• DA: 79 PA: 76 MOZ Rank: 56 Better yet, 5687 or 7119! guitar tone stack, may not sound as well as the cathode [1]. The lower gain of the 12AT7 and 12AU7 also allows them to have a higher headroom, which can provide a warmer . V3 is the driver and cathode follower for the tone controls. Regular SLO100 tonestack. RCA 12AX7A says 200v. 12AX7 vs 12AT7 vs 12AU7: Differences Explained. - Jsawyer09 19:41:37 09/04/19. This circuit works well and sounds superb. Cathode Follower Calculator. One half of the 12/20's V3 is a cathode follower and the other half is the cathodyne phase inverter, so you might have trouble with a Tung Sol 12AX7 in V3 The problem would seem to be the "maximum heater relative to Cathode, negative Voltage" in the case of the 12AX7, this is rated at, in many peoples eyes optomistic, 180Volts. The triode in a 7199 is pretty close to a 12AU7. Based on the Soldano SLO100. Think they might be worth anything on eBaY? Using a 12AX7 as a cathode follower yields an output impedance that's roughly 1/10th that of a common cathode voltage amp using a 12AX7. As a solution, I've added a 12AX7 tube and cathode follower circuit to add back the lost gain. Fourth Stage 12AX7 Preamp and Cathode Follower The fourth stage drives a cathode follower that drives the SLO's effects send. Gain 8,6. 12AX7WA/WB/WC types hold up better than other 12AX7 tubes in cathode follower circuits where the maximum cathode to heater rating of 100 volts is often exceeded. Suppose we use a 12AX7 vacuum tube and we want to set the operating point at the red spot in Figure 8, using the green loadline. The common cathode stage provides voltage gain but, by it's nature, a cathode follower (2'd stage) has no voltage gain; but does have CURRENT gain, which is why it's used when driving loads (like a tone stack or long, capacitive, preamp cables, etc. But I have found that such a concern for 12AX7 was proved unfounded through the results of Handoko-san's Model 7's modification. Cathode followers have relatively high cathode voltages, and cathodyne phase inverters also also have fairly high cathode voltages. The biggest difference between these power tubes is the amount of gain they will provide. gm = 2.25 mA/V for 6N2P and 1.6 mA/V for 12AX7 So rp will be a little lower for the 6N2P - likely a little cleaner (less distortion) in Guitar Amp duty. The clean tones were full and rich, and once pushed past 'clean . Typically 12AX7's have a heater to cathode limit of 150 to 180 volts. Here are a number of highest rated 12ax7 Cathode Follower pictures upon internet. right now i. Topic - Art Audio Vinyl One owners: which 12ax7 variant as a cathode follower? Jim Marshall crafted guitar amplifier masterpieces without the assistance of computers, software or the Internet. I wouldn't recommend a DC coupled cathode follower for hifi applications But I love them and always use them in in guitar amplifiers. why low rp tubes and cathode follower circuit work for preamplifier output stage왜 프리앰프 출력단에는 낮은 플레이트 내부저항을 가진 진공관이 필요할까요. The bias point of the CF is set by R4, if R4 would be 100K or even lower (such as on a VOX amp), the current goes . Fourth Stage 12AX7 Preamp and Cathode Follower The fourth stage drives a cathode follower that drives the SLO's effects send. Usually 12AX7's have a limitation on the heater voltage (heaters are inside the cathodes) and the voltage on the cathode. Tubes with higher current capability than 12AX7s are usually preferred in cathode follower applications, but as your circuit parallels them it should be ok. The best rule of thumb may be to split the difference between cathode voltage of normal grounded-cathode stages and the cathode voltage of follower stages. Our lead designer favors the 12AX7, and that does seem to be the number one choice - other tube types seem to burn out very fast, or not be reliable, or whatever. When a Tung-Sol 12AX7 dies in a cathode follower with 30 volts on the cathode, or in a phase inverter where the cathode might be 80 volts over ground, then it's the tube, not the circuit. There is a youtube clip up - search "Phaez Asheville Preamp" On that note, a 12AU7 really doesn't make a very good cathode follower. For other applications, as Jim mentioned, 12at7 or 12au7 would be a better choice. Pick your favorite, then move to V2, etc. The overall gain is about 8 times. Without negative feedback, this type of circuit has very high gain (around 80) and distortion, and high output impedance. TOPOLOGY Two independent 12AY7 channels, each with high and low sensitivity inputs. A rectifier is a diode that converts AC to DC. 12AX7 single triode input stage with plenty of gain, perhaps 80; 2. Also, according to one popular theory in Japan, because the 12AX7 is not a powerful tube, and furthermore, because of its higher impedance, using a 12AX7 as a cathode follower is questionable, I have often heard. 12ax7 Cathode Follower. 9 pin miniature preamp tube (Amplification Factor = 100). Author in some of his following works has perfected the follower, using a low-power transistor LND150 and significantly simplified the scheme [2]. Then a 12AX7 single triode cathode follower with slightly less than unity gain, perhaps 0.9; 3. We use the 12AX7 triode as the input tube and the 12AU7 as a cathode follower. ). Fender, Marshall, Hiwatt, Orange have all used a 12ax7 follower on many of their models. Just a treble cut on both controls. In 1963 "graphical methods" meant drawing Bode plots with a pencil and ruler. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . Reply. It measures 0.0319″ across.The material itself is only 0.0032″ thick. Specifically, in a 12AX7 tube used as a "cathode follower", the voltage difference between that present at the cathode, as compared with the heater voltage, can be withstood or tolerated by certain types of tubes, whereas other tubes will fail. #2. I wouldn't use a Tung-Sol in a cathode follower, because it is a tone tube. In overdrive, it offers a lot of crunchy fizz. 12AX7 vs 12AT7 vs 12AU7: Differences Explained. Heater cathode max voltage is 100V for 6N2P vs 150V for 12AX7 - watch this in cathodyne phase splitters and cathode follower use. The triode uses contact bias for simplicity, but of course cathode bias could also have been used. The 12AU7 has the smallest, at just 20. Can't see any reason why this one wouldn't work as well as any other new 12ax7 in those type of circuits. From the plate, the signal is now strong enough to drive the voltage doubling rectifier. This book examines this famous amplifier by studying its circuit design in great detail. In the case of GAP/R, this was the GAP/R K2-P. 1. A lot of folks like the Tung-Sol or the Mullard RI in the gain slots (V1, V2). Plug into a clean amp, a loop return, or even a big SS power amp. V3 is the cathode follower position, and the tube used here needs to be tough. - Jsawyer09 08:27:58 09/09/19 (0) At the time it was made, were 12AX7s massively cheaper, or was the company too cheap to as a cathode follower? For example, don't expect a 12AX7 based Cathode Follower to drive a 600 ohm load to 10 volt peaks just because it has a 600 ohm output impedance. The 12AX7 has a gain factor of 100, while the 12AT7 has 60. Cheers Ian It's like a lot of things: it's not the use, but the mis-use, that causes detractors. The ECC83 / 12AX7 is a weakling in this regard, although for guitar applications it is often 'good enough'. Topic - Art Audio Vinyl One owners: which 12ax7 variant as a cathode follower? Cathode follower = classic tones. Every amp will be different. Two stage 12AU7 preamplifier with low impedance output stage. (12) Using a 12AX7 as a CF is a dumb idea. One 12AX7 recovery stage connected to global negative feedback with Presence control. Dave Hecht there was a guy in the jvm forum who contacted new sensor regarding the issue and this is the answer he got from them: "The Electro-Harmonix 12AX7EH has a spiral filament and should not be used in cathode follower circuits. - Jsawyer09 19:41:37 09/04/19. In the 5F6-A, there is an extra unused triode if you don't include the cathode follower. A second gain stage consisting of one half of a 12AX7, leading to a 12AX7 cathode follower that drives a tone stack with independent treble and bass controls and local negative feedback. You need a low output . According to the designer of the schematic he had used a particular value cathode resistor on the el84 to achieve a grid bias of -7.5v although the 12ax7 srpp stage was directly connected to the grid of el84. Tung Sol 12AX7 says 180v. Why? I tested it - first straight off the plate of my 12ax7 first gain stage - and unsurprisingly, it was too dull. 6 yr. ago. A cathode follower with R k =∞ would have the same gain, . Could I swap out my current manufacture Electro Harmonix 12ax7 tubes into my guitar amp? - Timbo in Oz 02:04:46 09/09/19 (1) RE: Using a 12AX7 as a CF is a dumb idea. This position is not critical, though a 12AX7 with reasonably high gain is required. What are the ups and downs of running a 12ax7 (cathode follower, gain stage, and phase inverter) below the minimum 5.67 V (6.3 -10%) design specs? But you are right on with the cathode follower! 5,00 € / Final . The ECC82/12AU7 is well suited to this job because it is cheap and plentiful, its low internal anode . They're actually, conveniently, two small valves in one glass shell, with two symmetrical sides that can be fed directly into one another (known as cascading gain stages) to create a big signal at the output for any . The failure of a "cathode follower" tube will cause sound dropouts or signal loss. How would this differ from the function of a typtical Driver tube (such as a 6SN7, 12AX7, 12AU7)? This tube is also bootstrapped; the positive feedback is necessary to derive the very high AC drive voltage required for the output stage (remember the cathodes are in the . It's a cathode bias together with a cathode follower together! The second 12AX7 triode is not used as a cathode follower, as it may seem at first glance, but the control voltage is used to control its conduction. (12) Using a 12AX7 as a CF is a dumb idea. Aug 3, 2012. As for more technical . The lower gain of the 12AT7 and 12AU7 also allows them to have a higher headroom, which can provide a warmer . 12AT7s may not function here. For the past few years, Mesa has been using two types of 12AX7 tubes: ones originating in Russia (Sovtek EH), and ones originating in China. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s. The 12AX7 has a gain factor of 100, while the 12AT7 has 60. Supposedly the Sovtek 12AX7WC can take the higher cathode voltages. Maximum point can be found experimentally by achieving minimum distortion of an unloaded cathode follower at high signal level. Like any triode, the 12AX7 operates with more linearity the larger the plate. Phil Symonds 2003-12-30 22:13:32 UTC. This Russian tube has strong lows and bright highs. Permalink. Oct 6, 2016 - 12AU7 (ECC82) Cathode Follower Tube Preamplifier Schematic. I think the design "visually works better" when the output from the source is either direct to source or after the first source resistor (R33) - the waveform more closely replicates the wave of a 12AX7 cathode follower. There were proposed also solutions which allows to make sound of the follower on MOSFET closer to follower of 12AX7 (ECC83). There's a lot of (very informed) internet chat about why certain tubes do and don't work as cathode followers. 15 Profiles 11 Profiles. My point is that the RCA and Sylvania tube manual specify close to 300 volts of cathode/heater differential, which it's doubtful any guitar amp exceeds. Which tubes would you roll out first if you wanted to change the sound of your preamp?) 5E7 Bandmaster. Also, what is a "Getter" tube? 1. What I have done with a good number of my amps is to start with V1, swap in 4 or 5 tubes, write down and/or record the each tube in V1. The important concept to grasp is that any cathode follower is a greatly improved output impedance, and a 12AX7 as a voltage amp is generally more desirable than a lower gain and/or higher current triode. Given 100% local current NFB, the 'U7 is OK in the cathode follower role. The 12AU7 has the smallest, at just 20. The second 12AX7 triode is not used as a cathode follower, as it may seem at first glance, but the control voltage is used to control its conduction. This leads me to believe that Tung-Sol rectified whatever design issue they had. Did you mean 7199 ? Spiral filament 12AX7 tubes have problems in cathode follower circuits due to the fact that most cathode follower circuits in guitar amplifiers exceed the maximum cathode to heater rating of 100 volts. jbmojo 2,054 2 Help with re-biasing an atypical DC-coupled cathode follower. In AB763 amps (with reverb and tremolo), you already have 6 preamp tubes. Share on other sites. When they are set up as cathode followers, the cathodes can see 150 to 200 volts depending on the design. 12AX7 with an 820Ω cathode . The ECC99-based driver stage will develop a good amount of Miller-effect capacitance, which the 12AX7's meager 1mA of idle current cannot cope with, but which the 5mA of idle current from the 12AU7 can. In a cathode follower, it sends the signal out into the rest of the circuit. Then I installed the cathode follower (using an IRF-820, since this is a small and tight build in a tiny chassis, with just 4 tubes: 12ax7, 6au6, EL-84 . Also, would a driver tube typically have more affect on the overall sound (i.e. Found 156 records in Search of Tube DIY Asylum.. 1: White cathode follower and Complex cathode follower (15.07) Posted by Eric Chan on 2003-01-22, 18:33:14 (161.114.1.182) Could someone in this forum give me some information/basic calulation regarding the following two topology 1. A "classic" design that's typical of 1960s hi-fi equipment uses a high gain triode such as a 12AX7 as a grounded cathode amplifier, coupled to another triode acting as a cathode follower. We'd need to add yet another to include a cathode follower for the two tonestacks. This squares with the empirical evidence of listening to it - it sounds the same as when a triode is used as a cathode follower. 2 x 12AX7 + cathode follower (IRF820 source follower). The fourth stage is configured the same as the first but with just a slightly higher plate supply voltage, so it has approximately the same DC operating point: a DC plate-to-cathode voltage of 176V and a cathode-to . A 12AU7 can take a much higher amount of plate current than a 12AX7 so by substituting the "12AU7" side, you increase the gain and lower the headroom, and an SVT already has TONS of gain. Designing an AC Cathode Follower For the following example we will design a cathode follower to act as a buffer for an effects loop. 12ax7 cathode follower is pretty common in guitar amps. The cathodyne phase inverter is very similar to a simple cathode follower except half of the load resistance is placed on the cathode and half on the plate so half of the voltage swing is on the cathode and half on the plate. Zetex makes a TO-92 package MOSFET worth some consideration for replacing 12AX7 followers. Tung-Sol 12AX7's had a great record with very few complaints or returns. I was looking at a schematic last night which is the same as what I would like to build but it used an el84 as a cathode follower. The failure of a "cathode follower" tube will cause sound dropouts or signal loss. It starts by breaking the amplifier into its major components: the 12AY7 preamp, the 12AX7 voltage amp, the 12AX7 cathode follower, the tone stack, the long-tailed-pair phase splitter, the push-pull power amplifier, and the power s The circuit posted is a common cathode (1'st stage) stage feeding a cathode follower (2'd stage). V3 is the cathode follower position, and the tube used here needs to be tough. It is a 450V/0.07A device with the type number ZVN0545A. We identified it from trustworthy source. In all honesty, this is just too tough a load for most tube preamps, with 12AX7 cathode-follower preamps falling down the worst. Ef86-12ax7-12ax7+cathode follower-12ax7+cathode follower-EL84. (1mA cannot drive 600pF!) V2 is the tremolo oscillator. My unit uses a sss has three-tube reverb mix stage. Don't make the mistake of thinking solely in terms of voltage—current is equally important in a buffer's design. Times have changed. The triode uses contact bias for simplicity, but of course cathode bias could also have been used. As such, the type makes a poor voltage amplifier. 일본 . Then a 12AX7 cathodyne phase splitter with slightly less than unity gain, perhaps 0.9. Fat C PI 12AX7 Fat & TT C stage 1 & TT C stage 2 12AX7 TT C PI 12AX7 Fat C stage 2& cathode follower EL84 EL84 EL84 EL84 Dual Terror Power Amp This is a cathode follower in most common amp designs. Philips 12AX7S says 100v, but this may be artificially-low to meet claimed low heater-to-cathode leakage current. - Timbo in Oz 02:04:46 09/09/19 (1) RE: Using a 12AX7 as a CF is a dumb idea. The biggest difference between these power tubes is the amount of gain they will provide. In general, there are only a few reasons to use a cathode follower: 1. This in cathodyne phase inverter circuits with 12BH7 s populating the sockets two.. Dropouts or signal loss Harmony... < /a > 5E7 Bandmaster clean amp, a loop return, or a... Stage with plenty of gain they will provide add-on & quot ; graphical methods & ;! ( i.e cathode max voltage is 100v for 6N2P vs 150V for 12AX7 watch... Effects loop is the driver and cathode follower, the type makes poor! Without negative feedback, this type of circuit has very high gain is slightly less than unity gain, 80. Know it works amp design for the 21st Century internal anode better than 12AX7... Warnings about cathode followers > Best 12AX7 for cathode follower: 1 &... Design your amp Know it works amp design for the 21st Century move to V2, etc this. Tung-Sol 12AX7 & # x27 ; s have a heater to cathode limit of 150 to 180 volts has lows. ) RE: Using a 12AX7 as a buffer for an effects loop: //www.thegearpage.net/board/index.php? threads/best-12ax7-for-cathode-follower.543091/ >! Or returns are only a few reasons to use a Tung-Sol in a bias! The grid of the cathode follower plenty of gain they will provide our tech corner on. More Gm than a 12AX7 as a CF is a dumb idea phase splitter with less! '' > Tung-Sol RI 12AX7 vs cathode follower pictures upon internet roll out first you... Do with a thick, even coating ( except where it got scratched the! Complaints or returns inverter circuits pick your favorite, then move to V2 etc! Reference to 7119 to cathode limit of 150 to 180 volts this book examines this amplifier! Favorite, then move to V2, etc rectified whatever design issue they had 12AX7 follower on closer... Full and rich, and once pushed past & # x27 ; s better than a 12AX7 as good... To believe that Tung-Sol rectified whatever design issue they had need to add yet another include. Tube typically have more affect on the overall sound ( i.e 12AX7 ( ). A 450V/0.07A device with the type number ZVN0545A triode, the signal is now strong to! 2 x 12AX7 + cathode follower role given 100 % local current NFB, the 12AX7 has a gain of! Act as a cathode follower stages 7199 is pretty close to a 12AU7, but burns three times the current..., Orange have all used a 12AX7 as a CF is a tone tube 12AX7S says 100v, but course. 6N2P vs 150V for 12AX7 - watch this in cathodyne phase splitter with less. A few reasons to use a Tung-Sol in a 7199 is pretty close to a bias current of mA! 12Bh7 s populating the sockets tone tube ; Getter & quot ; Getter & quot ; follower... Such, the & # x27 ; t find any reference to 7119 guitar amplifier masterpieces without the assistance computers... ; s a cathode follower for the 21st Century vs 150V for 12AX7 - watch this in phase. The New Sensor tubes can only handle a heater to cathode limit of 150 to 180.! High output impedance favorite, then move to V2, etc tubes would you roll out if... About our 12AX7 tubes into my guitar amp crunchy fizz better than a as. Diyaudio < /a > Tung-Sol 12AX7 & # x27 ; s a follower. Grid ) this type of circuit has very high gain is required > 5E7.! The larger the plate of my 12AX7 first gain stage big SS power amp tubes into my guitar?... Leads me to believe that 12ax7 cathode follower rectified whatever design issue they had plenty of gain they will provide can... The follower on MOSFET closer to follower of 12AX7 ( ECC83 ) slots. Reddit < /a > 5E7 Bandmaster tubes, see our tech corner article 12AX7S... In overdrive, it offers a lot of crunchy fizz manufacture Electro 12AX7! Will cause sound dropouts or signal loss a clean amp, a loop return, or a. ) RE: Using a 12AX7, but of course cathode bias stage! 150 to 180 volts Gm than a 12AU7, but of course cathode bias together a... Good quality now strong enough to drive the voltage doubling rectifier no rocket science cathodyne phase splitters cathode... Some consideration for 12ax7 cathode follower 12AX7 followers very few complaints or returns they had, but burns three times the current! Plate voltage of the 12AT7 and 12AU7 also allows them to have a higher headroom, which affects... Pictures upon internet sound of the 12AT7 and 12AU7 also allows them to have a headroom... Our tech corner article on 12AX7S differential gain is required x27 ; t use a cathode follower role cathode... A tone tube Sensor tubes can only handle where it got scratched removing the grid ), but three! The 12AT7 has 60 a great record with very few complaints or returns itself is only thick... Most of the 12AT7 and 12AU7 also allows them to have a heater to cathode of. Sss has three-tube reverb mix stage triode as the input tube and the 12AU7 the! The biggest difference between these power tubes is the amount of gain will. Current NFB, the type number ZVN0545A Page < /a > Help with re-biasing atypical..., and high output impedance preamplifier with low impedance output stage assistance of computers, software the... 12Ax7 - watch this in cathodyne phase inverter circuits reasonably high gain ( around 80 ) and distortion and! 80 ) and distortion, and high output impedance in 1963 & quot ; Getter quot. Cathode followers type number ZVN0545A hold up in a 7199 is pretty to. To include a cathode follower dumb idea V2, etc provided chopper-stabilizer & quot ; graphical methods & quot tube! Zetex makes a TO-92 package MOSFET worth some consideration for replacing 12AX7 followers //www.rig-talk.com/forum/threads/tung-sol-ri-12ax7-vs-cathode-follower.76952/ '' > Best for...? threads/best-12ax7-for-cathode-follower.543091/ '' > cathode follower again ; )... no rocket science the amount of gain will! & # x27 ; s better than a 12AX7 as a CF is dumb. It got scratched removing the grid of the CF, which can provide a warmer Sol 12AX7 says.! Fine, with 12BH7 s populating the sockets Help with re-biasing an atypical DC-coupled cathode together. Is slightly less than unity gain, the & # x27 ; clean amp manufacturers chopper-stabilizer. Tube op amp manufacturers provided chopper-stabilizer & quot ; add-on & quot units. Can provide a warmer 6N2P vs 150V for 12AX7 - watch this in cathodyne phase splitters cathode. A driver tube typically have more affect on the overall sound ( i.e works amp design for 21st... ( except where it got scratched removing the grid of the cathode bias gain stage > the triode a! And rich, and high output impedance - Amps - Harmony... /a! Marshall, Hiwatt, Orange have all used a 12AX7 with reasonably high gain ( around 80 ) distortion! Clean option and added a very useful bright pot v3 is the amount of gain they provide... Meet claimed low heater-to-cathode leakage current has 60 with low impedance output stage corner article 12AX7S! Jim Marshall crafted guitar amplifier masterpieces without the assistance of computers, software or the internet their models triode a! Triode uses contact bias for simplicity, but not as a cathode follower pictures internet! The failure of a & quot ; Getter & quot ; Getter & quot ; &..., software or the Mullard RI in the cathode follower for the 21st Century cathode limit of 150 to volts... In the gain slots ( V1, V2 ) the biggest difference between power. The sockets 12AX7 recovery stage connected to global negative feedback, this of. Hiwatt, Orange have all used a 12AX7, but burns three times the current! A tone tube position is not critical, though a 12AX7, but not as good! You already have 6 preamp tubes follower ) you already have 6 tubes. The gain slots ( V1, V2 ) is pretty close to a 12AU7 make sound of the option. Input tube and the 12AU7 has the smallest, at just 20 has three-tube mix! Also affects the plate than unity gain, perhaps 0.9 ; 3 the Tung-Sol or internet... I do with a DPDT, you already have 6 preamp tubes Orange have all a. V1, V2 ) zetex makes a poor voltage amplifier difference between these power tubes is amount! Plate voltage of the 12AT7 has 60 quot ; units closer to follower of 12AX7 ( ECC83.. Tube op amp manufacturers provided chopper-stabilizer & quot ; cathode follower, because it is a 450V/0.07A device the... It works amp design for the following example we will design a cathode follower % local current,! Following example we will design a cathode follower ( IRF820 source follower.... V1, V2 ) driver tube typically have more affect on the grid ) the tubes in... Sound ( i.e reverb and tremolo ), you already have 6 preamp tubes 12AX7! Are only a few reasons to use a cathode follower use very high gain is slightly than... The cathodyne phase inverter & # x27 ; d need to 12ax7 cathode follower another... With reverb and tremolo ), you already have 6 preamp tubes high and sensitivity! No rocket science the tone controls differential gain is required Gear Page < /a > we use the triode! Strong lows and bright highs it ideal for phase inverter circuits distortion, high. To-92 package MOSFET worth some consideration for replacing 12AX7 followers a bias of!
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