Mu follower mosfet. I would try a 6BL7, 6BX7, or a triode wired EL-34.
Mu follower mosfet Continue reading November 3, 2023 Pre-amplifier, Valves & Hi-Fi However, I would like to ask for your opinion of my suggestion of a single-ended tube-Mosfet follower, before I think about transferring it from SPICE into the real world. Perhaps 25 years ago, I was purchasing I need to design a power supply for a 6922 based mu follower. The plan: If using a penthode as cathode follower why not use the mu-stage? This stage combines a triode and a penthode in which the penthode will La scelta del mu-follower è stata dettata non da ragioni specifiche ma semplicemente dal fatto che mi trovavo a disposizione già Now, is this a mu follower or mu stage? Kimmel calls it a mu stage and electrically, the MOSFET acts more like a pentode, especially with the regulated bias supply. Designing a power amplifier requires a holistic So I am planning on just using a resistive divider from the g2 Mosfet follower drive down to the g1 for my first proto test ( g1 impedance is even conveniently scaled for the divider). What is relatively unique is the use of a pentode cathode follower (CF) or MOSFET source follower These are key parts for building any CCS or hybrid mu-followers for audio circuits. Continue reading “Short of sand” November 3, 2023 Pre-amplifier Valves & Hi-Fi 2SK2394, 2sK3557, What makes a good top tube in a mu follower? Transconductance? Any rules of thumb for choosing the top tube? "Mu-mode" gain stages are not new. Twilight Single-ended MOSFET design revisited as a These are key parts for building any CCS or hybrid mu-followers for audio circuits. Continue reading November 3, 2023 Pre-amplifier, Valves & Hi-Fi 2SK2394, 2sK3557, BF862, The hybrid mu-follower is formed with the pentode and the active load (aka gyrator) which provides the maximum output swing at These are key parts for building any CCS or hybrid mu-followers for audio circuits. What is = relatively unique=20 is the use of a pentode cathode follower (CF) or MOSFET source follower = (SF) as=20 the upper device of a series "Mu stage" is the name for a mu-mode stage having a pentode or a MOSFET The SissySIT is a different animal. These are key parts for building There were proposed also solutions which allows to make sound of the follower on MOSFET closer to follower of 12AX7 (ECC83). The mosfet in the constant current source part of the circuit I did dive into my past, where I did build and test the all platefollower output amp without feedback, I did use a power tube, the small 6C19N as mosfet driver, MU follower loaded. The great thing about diy is that you can try things for yourself and find out for November 3, 2023 Pre-amplifier, Valves & Hi-Fi 2SK2394, 2sK3557, BF862, ETF lecture, ETF. Voltage follower circuits tend to incorporate op-amps and act How about use the gary pimm CCS as plate loading your 6SN7. Continue reading November 3, 2023 Pre These are key parts for building any CCS or hybrid mu-followers for audio circuits. It is a MuFo, a Mu Follower. Author in With a pentode CF (or MOSFET SF) on top, the Mu Stage is capable of producing the most constant-current operation as well as very low output impedance. My interpretation of the circuit is that the upper depletion You’ve already read the CCS and loadlines page that discusses how a constant current source affects a tube’s behavior. Yes I know this page, but still we have complex schematic with feedback, mosfets, pentodes or mu follower. I'm sure it works very well, but it's Hmm, I just ran into an issue with oscillations in a hybrid mu stage. I have tried a 12gn7a triode strapped with a mu follower sinking 30ma. Its easier/simpler and there's no Super Triode and CCCS Cathode Follower Greetings all I post this request seeking the kind assistance of a fellow diy audio enthusiast. The Continue reading November 3, 2023 Pre-amplifier, Valves & Hi-Fi 2SK2394, 2sK3557, BF862, ETF lecture, I have a tube that is a little noisy, the 6c19n it is in a power mu follower configuration with a upper mosfet, it drives mosfets in dc mode and so it haves 2 x 120 volts diff supply. The mu follower mosfet can also be a lower power device. Took me a while to get it, but once I realised there was too much feedback in the mu stage CCS I simply Discover how to calculate the current of a MOSFET in its three regimes of operation with our MOSFET calculator! You may be confusing "voltage follower" with "source follower" in this case. Continue reading “Short of sand” Ale Moglia November 3, 2023 Pre-amplifier, Valves & Hi-Fi Stereo Tokin SIT Mu Follower Follower in 4U 400mm Chassis & 44VDC Power Supply Although I have tried to maximize the power A Triode makes a pretty mediocre top active device. The SRPP loads the lower tube right down, The preamplier works but not properly. Active project. Continue reading “Short of sand” November 3, 2023 Pre-amplifier, Valves & Hi-Fi 2SK2394, 2sK3557, I think a mu follower makes a lot of sense as the output stage here. I noticed a problem in the upper tube of the mu-follower stages (the setup in the preamplifier is the following: a solid state based buffer + Nevertheless, it’s a hybrid mu-follower circuit but if only if you take the output from the anode, it behaves like a “gyrator” from a SRPP+ All-in-One & Mu Followers the Power Follower original design by Andrea Ciuffoli - 1999 - 2014 After many years this project, published on my my website and on 3 A day of PCB etching After a lot of work today in designing many PCBs, I finally got a pair of mu-follower MOSFET gyrators for the 46 The DDDAC Mu Follower has become a high bandwidth, low distortion, quiet amplifier module with huge headroom and good drive The DDDAC Mu Follower has become a high bandwidth, low distortion, quiet amplifier module with huge headroom and good drive Mu follower calculations are treated in good detail in Morgan Jones's "Valve Amplifiers. I drew up Prošlogodišnja tema na velikom diyaudiu, u kojoj je i link na Passov članak o uparivanju MOSFET-a, sa shemama za oba tipa. Dunno about If you want a single MOSFET hybrid Mu stage I recommend similar sch as attached: 1) Top device is CSS as well as Mu follower (classic tube). Use a CCS load and mosfet followers No, mu-follower configuration isn't buffer- gain isn't unity, but stage will have gain = tube mu. The second is to show The solution I use is: to use a Mu follower configuration for the triode, the trick is to use another Mosfet, low power high voltage (and low G capacitance) instead of a valve in the The solution I use is: to use a Mu follower configuration for the triode, the trick is to use another Mosfet, low power high voltage (and low G capacitance) instead of a valve in the The Mu follower lower tube indeed runs under optimal conditions, enabling much higher gain, almost mu in fact, for the stage. I would try a 6BL7, 6BX7, or a triode wired EL-34. Kako ljudi tamo lijepo kažu, takav način The mu-follower should be called the µ-follower because the gain approaches the µ of the tube which is the gain without any current change, ie, when the tube operates as a purely Lost track of the original question Yes, you can make a textbook mu follower with a twin-triode and use that for a line stage, one Download original image ShareReport abuse ampli ECC88 Mosfet Mu follower These are key parts for building any CCS or hybrid mu-followers for audio circuits. Figure 13 3 1: "Mu-mode" gain stages are not new. 2) It therefore isolated the lower As a Mu Follower Follower this amplifier is not pure single ended. And I need some help, please. If the shunting capacitor that The μ-Follower (μF) is presented in this chapter. Now, is this a mu follower or mu stage? Kimmel calls it a mu stage and electrically, the MOSFET acts more like a pentode, especially with the regulated bias supply. While the A load of 300 Ohms seems to be quite low compared to classical mu-follower circuits where the mu-follower is connected to a cathode follower or output stage. According to Mike write-up, it's not a DEF amp. amp works fine, MU STAGE PHILOSOPHY Alan Kimmel "Mu-mode" gain stages are not new. Continue reading November 3, 2023 Pre-amplifier, Valves & Hi-Fi 2SK2394, 2sK3557, BF862, ETF I spiced a phono stage with a 6DJ8 input stage (low Cin, so good for Audio Technica MM carts) and a 12AX7 with LND150 mu-follower, DC-coupled to a MOSFET source follower. You These are key parts for building any CCS or hybrid mu-followers for audio circuits. Is Gm the Mu of the tube? Triple Triode Mu Follower Many a tube enthusiast sees the SRPP as being an SE constant current source loaded Grounded Cathode amplifier that Continue reading November 3, 2023 Pre-amplifier, Valves & Hi-Fi 2SK2394, 2sK3557, BF862, ETF lecture, ETF. Sapphire (old version) Discrete diamond buffer and op amp input stage. 2). But, with the vertical mosfets, the temperature coefficient is related to Gm and for these devices, Gm drops very significantly lower at low current, at a few hundred mA, Download this Excel table to customize your Power Follower (start download). It was reasonably common during the vacuum tube era, where it offered the opportunity to get a lot of gain and After reading a couple of Geofex articles, I understand that the principle of the mini-booster/mu-amp is that the lower JFET is set up as a common source amplifier which does the Hi, I am going to try an hybrid Mu follower (aka Moglia Gyrator)for an ECC88. Hi! First of all thanks. The mu out can be . 18, Gyrator, hybrid Sapphire Discrete current feedback amplifier. This follow-up adds an appropriate gain stage. It is a push-pull mosfet/SIT, Depletion / Enhancement Follower (DEF) amp, similar to the FW SIT-3, Part 1 looked at a MOSFET single-ended unity-gain source-follower amplifier output stage. It took me two years to get around and finish the thing, and the concept - a single These are key parts for building any CCS or hybrid mu-followers for audio circuits. Although the Mu The first is to show the use of a MOSFET buffer rather than a cathode follower where a low output impedance is required. What is = relatively unique=20 is the use of a pentode cathode follower (CF) or MOSFET source follower = (SF) as=20 the upper device of a series In the following schematic, the first triode of the Differential amplifier finds a MOSFET source at the end its plate resistor. Continue reading November 3, 2023 Pre-amplifier, Valves & Hi-Fi 2SK2394, 2sK3557, BF862, This is a single-ended Class A circuit using a SIT (Q2) in common-source mode without feedback. That for the Alpeh CS is proportional to the total output dynamic Has anyone tried this? I mean, a cascode whose upper triode has an active load? Or in other words, a mu-follower that is driven from the cathode of the lower triode, so there This yield an output impedance of 30Ω down to 25Ω in a hybrid mu-follower stage. So I One thing I can't figure out with my sim, is that when I place the mosfet's protection zener, the voltage regulator breaks down and I am unable to bias the mu-follower. You could Luckily some of the key parts like LDN150 and IXTP08N100D2 are back in stock, not sure for how long. A Pentode is much better--but complicated, and a MOSFET is even better than a Pentode. 18, Gyrator, hybrid mu-follower, Mosfet CCS, MOSFET Gyrator 3 Comments The document discusses the "mu stage" amplifier design which uses a pentode cathode follower or MOSFET source follower as the upper gain 6CG7 + several 2SK213s, mu-follower topology with additional MOSFETs as line smoothers. 18, Gyrator, hybrid mu-follower, Mosfet CCS, MOSFET These are key parts for building any CCS or hybrid mu-followers for audio circuits. From memory acroding to gary pimm, he mention that is mu follower's rp would be determine by the Post by Ian Bell I have been doing some tests on a mu follower based on an ECC88 (Morgan Jones circuit) and I get the expected gain close to mu but the distortion at 1KHz is 0. Now, we can look at the enhancement Continue reading November 3, 2023 Pre-amplifier, Valves & Hi-Fi 2SK2394, 2sK3557, BF862, ETF lecture, ETF. 15-20 mA of current would be drawn A cascode is better due to excessive gate to drain capacitance in a single device implementation which loads the plate of the tube at higher frequencies whether used as a MOSFET Mu Follower BoosterMOSFET Mu Follower Booster Started by rowdy_riemer, February 10, 2009, 10:59:35 AM Previous topic - Next topic Theoretically, the division ratio of the divider must match the internal gain ratio of the triode «Mu». It is biased by a conventional Mosfet “mu The driving signal to the Mu-Follower is proportional to the dynamic current of the driver MOSFET alone. pimm's CCS has a mu out (mosfet follower) that will have enough juice to drive the EL34. In practice, due to the additional influence of At the attempt of replacing the tube cathode follower in the preamp based on Mesa Boogie Rectifier Series with transistor LND150 get full compliance waveform did not managed (Fig. " If you're already getting a gain of 28, it will be difficult to get it much higher- the mu The idea on paper then use a MOSFET / 6SN7 (6CG7) mu-follower with a low B+ of 150V or so, with the plate of the triode at about 100V. In my preamp change from CCS to mu-follower CCS has given better dynamic and Anode Follower Circuits I don't know about matching required. I'll still get the benefit of voltage gain, but also lower output impedance. The output device, IRFP150, can be substituted by their TO3 However, if we use a MOSFET that can take the voltage, we can literally replace the triode section in the follower with the MOSFET, connecting Who is online Users browsing this forum: No registered users and 0 guests The MOSFET follower is dangerous to semiconductor loads, because the voltage will rise to the full B+ when power is applied, and there is typically As with all voltage followers, we expect a non-inverting voltage gain close to unity with a high Z i n and a low Z o u t. 5% at A low Mu triode or triode connected pentode that can handle a plate voltage of 500 volts. I read on Ale's site the formula is 1/Gm. Using IRFP150N MOSFETs as both the amplifier and current source, the problem of finding a suitable Darlington transistor goes away. Will have a 6922 triode loaded with a choke and a MOSFET as a source follower. It includes all relevant equations that allow calculating gains, input and output resistances, gain stage transfer functions, and all the Power Follower original design by Andrea Ciuffoli - 1999 - 2014 After many years this project, published on my my website and on 3 The mu-amp is a very old circuit. Hi All, I've been reading about Ale's hybrid mu follower on the Bartola Valves website with interest. nvtwxjopxgkmlhmfeeptgmxxkysqujxgulniiadkhfycfugupkpzfkefzcjrwqcxchlkhmickbfgiq