Triode t of a 6k7 variable mu pentode, strapped in triode mode. Have had these speakers from new for just short of 2 years they have been used in my second tier setup in the bedroom. Note that there are triode, pentode and tetrode symbols under misc in the components drawer. The t is of poor quality, showing structural tting problems for more negative grid voltages, but also at low anode voltages at moderate grid voltages. At worst, the results are deceptive, since the computational accuracy of course doesnt match the fluctuations of the real components and constructionrelated dependencies. In a power pentode there are three grids instead of the triode s single grid. Lt spice fast fourier transform output of common cathode gain stage. In spice you can easily fiddle around with the values of the individual components, and immediately view the results directly in the frequency response. Nearly all manufacturers have a spice equivalent for most of their parts. May this tool help you to get the best from them and unleash. The license agreement for the files of the vacuum tube modeling. The model card keywords nmos and pmos specify a monolithic n or p channel mosfet transistor. We can modify frequency of carrier, modulation frequency and modulation depth. However, you can also skip to chapter 3 for the installation procedure.
Use ltspice iv windows version on mac os x jackenhack. Save it to the folder where you will be putting your schematics. Help ltspice help can be found on the fileeditwindowhelp menu at the. Its a fantastic piece of software for testing almost any kind of component. The model card keyword vdmos specifies a vertical double diffused power mosfet. Converting a triode model into an ltspice component. Amplitude modulation source in ltspice electronics forum. The ac sweep simulation of the single gain stage shown in figure 2. Triode stage 12ax7 tube spice model tutorial youtube. Below is a simulation of using a sine function to vary a resistance with time, along with an ac currentsource, to generate an am signal and a dsb suppressedcarrier modulated signal. Hence, triode gets out in the field, listens to the users, understands them and experiences their reality. The speakers are in mint, totally unmarked condition, they c. Ltspice model of 6l6 as beam power tube vs triode mode. Electrical engineering stack exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts.
Engineering reports improved spice model for triode vacuum tubes walter sjursen, aes member j sarnoff corporation, princeton, nj 085435300, usa an improved pspice analog behavioral model for the triode vacuum tube is given. These model improvements allow better simulation of the circuits operating the triode at low plate currents, low plate voltages, or with positive grid voltages. Using 3 sinus voltage sources parallel or in series. The users guide was written by frederic broyde and charles rydel. The motivation for developing livespice is to help prototype guitar effects and amplifiers, without requiring constructing a physical circuit or waiting for an offline simulation to run to try it out. Improved vacuum tube models for spice interface technologies. Download the generic triode model click link on the left, you want the pspice one as ltspice understands them just fine. Vishay has developed a number of software support tools to assist design engineers. The information gathered is the fuel for marketdriven innovation and creativity, both essential to the development of profitable products and services. The pentode model equations, as defined by koren, have one very, very important property. Running yakopcics models and creating the knowm model. Am signal as an addition of carrier and 2 side waves. Arsov faculty of electrical engineering and information technologies ss cyril and methodius university skopje skopje, macedonia g.
It works well for triodes, i dont know if it can be used for pentodes though. The actual developer of this free software for mac is linear technology. An improved pspice analog behavior model for the triode vacuum tube is given. Ltspice and vacuum tube models last updated 111107 17. Ltspice 3 ways how to get an am amplitude modulated signal. The spice model of the pat4006cfb in appendix a3 matches plitrons published data very closely. This video shows how to download, install, configure and start working with ltspice on a mac. Much more power at a beam power tube with the necessary addition of a screen supply. Livespice is a spice like circuit simulation tool for processing live audio signals. Click on the appropriate link, and check back regularly to find new releases or additional design tools. Later on in the model we can find the commented line with following r63.
The default filename for the programs installer is ltspiceiv. Included in the download of ltspice are macromodels for a majority of analog devices switching regulators, amplifiers, as well as a library of devices for general circuit simulati. I am attempting to simulate a long tail pair phase splitter using two 12ax7 triodes in ltspice. Ltspice model of 6l6 as beam power tube vs triode mode with 5k and 6. Parametric spice model for static induction transistor sit. The model used in the tool is koren improved triode 5. The light blue line is dc bias voltage second filter cap c2. Apr 01, 20 4p1l triode spice model after playing for some time with dmitrys great dht composite triode models, i looked at refining the model by matching my own set of curves of the 4p1l in triodemode. Due to popular demand, a version for spice 3f4 compatible engines is now available for download. The program consists of a highperformance spice simulator that greatly.
Included in the download of ltspice are macromodels for a majority of analog devices switching regulators, amplifiers, as well as a library of devices for general circuit. These include spice models, custom calculators, and thermal simulation tools and are listed by product category. Below is a simulation of using a sine function to vary a resistance with time, along with an ac currentsource, to generate an am signal and a dsb suppressed. A triode model is based on the following equations. The knowledgeable among you probably know they are multi award winning speakers and are highly rated across the board. The element values are taken from a table of values in 5 for resistancecoupled amplifiers using the 3av6, 4av6, 6av6, 6eu6, 12av6, 12ax7a, 20ex7, and 7025 highmu vacuum tubes. The 6bm8 works if you choose the tetrode symbol and the above spice directive for the 6bm8p. If you have any working models that you would like to add, please let me know.
Circuit simulations with spice systems are not necessarily required for simple triode circuits. Actually, i use korens model since i found it to better adhere to real plate curve data. You have to rename the symbol from tetrode to 6bm8p to match the spice directive. Considering the triode model described in the previous section, the above schematic becomes. Triode and tetrodepentode models contain a diode for. I installed ltspice on a mac with mojave and i would like to replace the standard models in the libcmp directory by the improved version. Much of the material in here originally appeared in glass audio, vol. The distortion of the signal is intentional, this is from a guitar amp with high distortion. This is a freeware spice simulator downloadable from linear technology, the ic company. Spice ing such triode composites is fairly simple, as for instance, the parameter kg1 for the koren models must be divided by the number of slices in the composite, which results in curves identical to the base tube, no other transfer function changes needed i tried that, ive developed java applets to match the tubes.
An inverse riaa signal is used as an input, either as a passive predistorted signal, or as a laplace function of an ac voltage source download ltspice file. Components library and circuits ltwikiwiki for ltspice. Simulating triodes in ltspice, long tail pair phase splitter. At the moment only a few tube are present in the library but i hope to develope a good and useful thing. Ltspice 3 ways how to get an am amplitude modulated. If you want to use the heater model, a symbol will need to be made up for it this is easy with ltspice. A lot of this is on duncan munros site, but for more or less completeness, heres how to add tube spice modeling to lt spice. In this post i will run a few of chriss memristor model simulations in ltspice followed our own and ltspice then will model saturation and hysteresis. I want to know if the circuit is wrong, or if the simulation is wrong.
View topic drop down menus for selecting your tube. Triod e goes where you go with your iphone and ipad. Add external models of components into lt spice schematic and. Aes elibrary improved spice model for triode vacuum tubes.
Parametric spice model for static induction transistor sit in triode mode of operation goce l. Livespice is a spicelike circuit simulation tool for processing live audio signals. Download ltspice section of ltspice homepage doubleclick the downloaded dmg file to mount the volume. Improved vacuum tube models for spice simulations, part 2. Getting started with ltspice for mac woolsey workshop. It does not explain how to use the circuit simulator but will give the user a better understanding how the model behaves and tips on convergence issues.
Laniers pspice triode calculator is a promising program for finding tube model parameters. I tried multiple subcircuit models for the triode, all yielding the same results. The component will then show up as a menu selection. Nevertheless, you can use spice as some kind of pimpedout calculator. In a power pentode there are three grids instead of the triodes single grid. Lets have a sinus carrier of khz from medium waves range and a modulating 1 khz sinus wave.
Jan 30, 2012 note that there are triode, pentode and tetrode symbols under misc in the components drawer. Just playing with different configurations of a 6l6 running as a beam power tube and as a triode. The effects of initial electron velocity, low plate voltage, and positive grid voltage are included in the model. Ltspice model of 6l6 as beam power tube vs triode mode with. Before i start testing a new idea for an electronic circuit and building it on a breadboard, i usually want to check it with ltspice. Help ltspice triode electronics forum circuits, projects. Our vacuum tube modeling package can help you check your new ideas and to better understand and improve your vacuum tube circuits. Due to popular demand, a version for spice 3f4 compatible engines is. The best way to enjoy all of your favorite internet radio station s wherever you go. Spice model triode or whatever at least one subcircuit is named in your normally used. Ltspice does not have a generator for amplitude modulation so heres a way to do that. These are as much fun as shampooing cats, so lots of luck.
This resistance is intended to model the skin effect losses, which is proportional to sqrts. In this paper however a software tool called ltspice is used as an aid in the design process of an guitar amplifier. Included in the download of ltspice are macromodels for a majority of analog devices switching regulators, amplifiers, as well as a library of devices for general. Primary and secondary resistances have been omitted for the sake of simplicity to avoid bumping into the limits of the pspice evaluation package and because they have very little effect on performance. For all of these components, place the subcircuit and the component in their respective folders, then restart ltspice. Oct 30, 2017 just playing with different configurations of a 6l6 running as a beam power tube and as a triode. Apr 25, 2016 ltspice does not have a generator for amplitude modulation so heres a way to do that. Here are models of a few popular audio tubes that have been generously donated by others.
This is a new model which is designed to offer significant increases in accuracy over previous models that we have made up, or which have been referenced here. As my principal pursuit is now photography, i wont have much time to update this article or answer difficult questions. An example of using a dot command is adding a special model you want to use for. Parametric spice model for static induction transistor. Model description microchips op amp spice macro models were written and tested in orcads pspice 10. These instructions dont follow every possibility with every model, but if you run through this one you will get the general idea. I did this simulation in order to have a known starting point for developing some of my newest vacuum tube and hybrid circuitry. After youve installed pspice on your computer you must install or create the tube models.
In the swcadiii directory thats the default where all the schematics you create reside usually under program files and ltc or whatever place the include files. However, the mathematical model of a vacuum tube triode is usu ally a dualport. Spice simulation of a loudspeaker with thiele small parameter. Walks through how to change an nmos transistor from the default model to a model from an external source. Spiceing such triode composites is fairly simple, as for instance, the parameter kg1 for the koren models must be divided by the number of slices in the composite, which results in curves identical to the base tube, no other transfer function changes needed i. Aes elibrary spice models for vacuumtube amplifiers. After playing for some time with dmitrys great dht composite triode models, i looked at refining the model by matching my own set of curves of the 4p1l in triodemode. Ltspiceswitchercad iii is a complete and fully functional spice program electronic. The dark blue line is the dc voltage at node 2 first filter cap c1. The pspice user community is your destination to find pspice resources, ask and answer questions, and interact with your industry peers and pspice experts.
There is a program ive used available that will let you take published tube curves, fit the model to the curves, and then spit out a spice subcircuit. On top right you will find all parameters for a spice simulation. Jan 28, 2005 a lot of this is on duncan munros site, but for more or less completeness, heres how to add tube spice modeling to lt spice. Dmitrys tool for pentode is difficult to fit to the pentode curves, not as the triode tool which is very accurate. Laboratory manual for engineering electronics galileo open. The mosfets model card specifies which type is intended. Ltspice iv is a fourthgeneration spice simulation program from linear technology.