Each stage of the real amp has been recreated preamp, tone stack, reverb, power amp and speaker simulation, and we added an extra multiband eq. I have experimented via spice with power filtering, tone stack, and other passivebased circuits. Vacuum tube preamplifier analysis and spice simulation. The above link is just one place you can download it. Arguably the most sophisticated vacuum tube amplifier design ever. Results of the model itself and when embedded in an amplifier simulation are presented and align well. Subsequent papers will describe analysis and design techniques for preamplifier stages. Demo is functional for 45 days, but will not save or print. For tube models search on pspice vacuum tube models. The emperors new amplifiertm my ultimate dream amplifier. Using a vacuum tube triode as an audio amplifier using transformers in both stepdown and stepup operation how to build a highvoltage dc power supply using a transformer to match impedances. Tube modeling plugin for vst audio units protools rtas for direct recording of bass guitar. This 6v6 has the standard rugged construction weve come to expect from jj which.
Was hoping that folks who develop modelers would be using some. I simulated this circuit and found that it could give the required gain and almost the required output impedance. In multisim 7 and 14 the tube models seem to be much the same, but i get no sensible results from simulation. Apr 10, 2010 the slides are pretty heavy on engineering design terms, but give a good feel for what it takes to construct and tune an audio amplifier using vacuum tube technology. Also contains some vacuum tube models which drop straight on, and an example of a vacuum tube power amp. Welcome to my vacuum tube audio page, which i dedicate to the reader who seeks an indepth understanding of amplifier design who wants to learn the factors that contribute to audio quality who doesnt buy the myths of the highend marketplace, where old designs enhanced with. Almost complete overview of guitar amplifier simulation. Search on pspice student to find additional links and resources, including libraries of literally hundreds of thousands of components. The concept of a linear smallsignal ac model for the vacuum tube triode is presented and employed for circuit analysis. Audio plugins for all operating systems windows, mac os x, linux, ios and android, tagged as tube preamp simulator. However, it sounds fine when bypassing the preamp and going straight into the amp. Simulation of a giannini true reverber vacuumtube guitar ampli. Oct 25, 2017 this is the second video associated with the modeling of vacuum tube output transformers with the spice family of simulation programs. Dsp filter design software and dsp based boards and systems modpex product and support.
How does the foobar tube sound component compare with a good quality tube amplifier. With the resurgence of interest in vacuum tube audio amplifiers among audio purists, vacuum tube amplfier basics is right on target. Bias probe plate voltage tester tool for tube amp amplifier pvt made in usa. Since i joined comsol in 2010 ive presented about half a dozen webinars. Vacuum tube circuits electronics tutorial and schematics.
Curve captor is a free distributed under gpl vacuum tube modeling software that brings the advantages of modern computer simulation tools. Although this is only a very brief introduction to vacuum tube audio electronics, it is sufficient to begin simple design and analysis. Vacuum tube audio amplifier discrete semiconductor. This type of tube or valve uses a second grid called the screen grid that is placed between the main control grid and the anode. I built one using an ixys ccs ic and it worked very well. The effective input impedance of an amplifier depends on the impedance connected from input to output. Is there a known problem with the models or am i doing something wrong. Also host the excellent magdemo transformer design software, and a host of useful newsletters on spice modelling. Ltspice is a very powerful and reasonably easy to use free circuit simulation program. Improved vacuum tube models for spice simulations, part 1 improved vacuum tube models for spice simulations. The apparent scaling of this impedance often dominates the input impedance and frequency response for the amplifier. Studio devil virtual bass amp software download musicians. The book walks you through the basics of developing a schematic, setting up a simulation, integrating vacuum tube models, and interpreting the results. There are several types of tetrode vacuum tube, but the one that is virtually always referred to is the screen grid class of tetrode vacuum tube.
Simulate preliminary designs in orcad cadence simulation software 3. Also pick a time for the simulation, in this case 15 seconds. Store information lees electronic components 41 fraser street vancouver british columbia v5v4e9 canada. Welcome to my tube amp simulation software page paragraph about tube amp design simulation. In case anyone is interested, there is a free student version of pspice that is available for download. Curve captor is a free distributed under gpl vacuum tube modeling software that brings the advantages of modern computer simulation tools to design of vacuum tube electronics. My original intention was just to document the parameters of. A vva can be used to color the sound of a digital recording by adding tubewarmth or fatbass in addition to adding subtle harmonics to. Updating norman korens tube amplifier design interface. Vintage amplifiers can take effects to the next level. I did this simulation in order to have a known starting point for developing some of my newest vacuum tube and hybrid circuitry.
Do you know a software hardware dsp that can simulate a true tube sound. A resource for designing tube amplifiers with spice simulation. Last week we held a webinar on vacuum system simulations and it was definitely the most fun webinar todate. Fyi, there are spice vacuum tube models available on the web for free, but personally i have never saw the need. Diy audio projects forum vacuum tube amp simulation. Welcome to my vacuum tube audio page, which i dedicate to the reader who seeks an indepth understanding of amplifier design who wants to learn the factors that contribute to audio quality who doesnt buy the myths of the highend marketplace, where old designs enhanced with premium components and dressed up in impressive packages command astronomical prices. Gather hardware components and characterize transformers for emulation in modeling software 4. On a lark i ran the phil tube preamp vst through my 12au7 tube preamp and what came out was a nasty sound, like hard clipping, even with the gain reduced. Vacuum system simulations webinar and videos comsol blog. Vtdatas database also includes vacuum tubes of historical interest, such as the early two digit types 45, 80, etc. The effective input impedance of an amplifier depends on the impedance connected from input to output of the amplifier. It hasnt been updated, and i wrote to norman to ask him if i. Spice simulators will allow you to check out your designs on the pc, before. The downloadable psspice student version version 9.
Here is the list of best free circuit simulation software for windows. The tube cad journals first companion program, tcj filter design lets you design a filter or crossover passive, opamp or tube without having to check out thick textbooks from the library and without having to breakout the scientific calculator. Edn hybrid vacuum tubesolidstate audio power amplifier. It shows much technical competence relative to analog design, audio design, spice simulation, and generating custom models for tubes. This is the downloadable version of studio devil virtual bass amp, a tube modeling amp plugin designed to be used for direct recording of bass guitar by bringing lifelike tube amp tone from a simple, intuitive interface.
About vacuum tube software the resource is currently listed in in 5 categories. Need vacuumtube circuit components audio electronics. For additional information about designing tube amplifiers, refer to the theory section. Save it to the folder where you will be putting your schematics.
Using these software, you can actually checkout how a circuit will behave, and also know additional information including its waveform. Log ago i successfully did simulate several vacuum tube circuits in electronic workbench. Because innovative development is difficult, most equipment marketed today has been based on old designs, with little thought given to their. Mcs 3865 integrated amplifier serviced 100 % working. Download the generic triode model click link on the left, you want the pspice one as ltspice understands them just fine. This is possible because these products have special hardware that. Weve done the work for you and found 5 of the most popular high end tube amps on the market. A common cathode vacuum tube preamplifier stage is analyzed and simulated. Since the vacuum tube is a highvoltage, lowcurrent device, and most speakers are lowvoltage, highcurrent devices, the mismatch between them would result in very audio low power output if they were. Vacuum tube audio amplifier chapter 5 discrete semiconductor circuits pdf version. Pdf vacuum tubes are still widespread in modern audio circuits. Download ltspiceswitchercad iii from the linear technology website.
The first electronic amplification of sound was done with vacuum tubes. This paper presents a tube guitar amplifier simulation made with the webaudio api, that reproduces the main parts of the marshall jcm 800 amplifier schematics. Schematic capture and spice simulation, magenetic designer transformer software. Additional subjects that will be examined include vacuum tube spice simulation and small signal analysis. It can be found within their dc8 and forensics8 software programs. From the menu, simulateedit simulation cmd, and make sure that start external dc supply voltages at 0v and also skip initial operating point solution are checked.
Ltspiceswitchercad iii a nice easy to use simulator which is gaining rapid acceptance. Our website and phones are open, but shipping may take a few extra days, for the safety of our team. 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. Theres a page on how to use it with the vacuum tube models here. Keep those filaments lit, design your own vacuum tube. Ever wonder what goes into the design of a vacuum tube audio amplifier. The slides are pretty heavy on engineering design terms, but give a good feel for what it takes to construct and tune an audio amplifier using vacuum tube. Livespice is a spicelike circuit simulation tool for processing live audio signals. Vacuum tube audio amplifier discrete semiconductor circuits. It has all the information youd expect in a tube manual. Dual bias probe tool tester for biasing tube amp amplifier made in the usa.
If the file comes back as a load of text, best to use rightclick and save as on the link. I desperately want to see vacuum tube components added to the list of available circuit components. From the menu, simulateedit simulation cmd, and make. Tube amplifier design simulation discussion in amps and cabs. These freeware let you design as well as simulate circuits on your pc. If you are down with bode plots and circuit diagrams, though, it could serve as a nice introduction to building a class ab amplifier circuit. A virtual valve amplifier vva is software algorithm designed and sold by diamond cut productions, inc. Real time tube guitar amplifier simulation using webaudio. Pdf computer simulation of audio circuits with vacuum tubes. Due to the wide spread usage in hifi and guitar amplifiers the ecc83 is one of few types of. Virtual analog modelling is an active area of research, which seeks to create software that. A class ab power amplifier is capable of generating more powerusing the same tubethan the class a amplifier, but more intermodulation distortion also will be generated.
If you havent heard you can get microcap for free, so help spread the good news that micro. Ltspice and vacuum tube models last updated 111107 17. I currently design and build vacuum tube guitarbass amplifiers at home for both fun and profit. Vacuum tube circuits and tutorials 2 valve 40m cw transmitter, one valve 3. Keep those filaments lit, design your own vacuum tube audio equipment.
This site contains a description of an integrated simulator program ispice, and lots of useful newsletters on spice modeling. Distortion and overdrive effects guitar pedal with tube amplifier simulation and blues guitar tone with level, tone, and gain controls. This is critical and applies to any simulator, not just ltspice. A class b rf linear amplifier will generate still more intermodulation distortion, but is acceptable in certain applications. If you leave them open the simulation engine will try. This is a freeware spice simulator downloadable from linear technology, the ic company. Jun 28, 2008 id like to experience the great tube sound that audiophiles talk about.
Tubelab is both our name, and the name we gave our vacuum tube prototyping environment several years ago. This is the second video associated with the modeling of vacuum tube output transformers with the spice family of simulation programs. Integrated pcb placement software now available too. The vtdata software package is a complete vacuum tube manual on your computer. Computer simulation of audio circuits with vacuum tubes. Do you know a softwarehardware dsp that can simulate a true tube sound. Studio devil virtual bass amp software download musician. Buy products related to vacuum tube amplifier products and see what customers say about vacuum tube amplifier products on free delivery possible on eligible purchases. These calculators automate the plotting of dc and ac load lines for guitar amplifier. The last thing you want is to have that moment of regret when you install a new tube amp and find that you overpaid when a cheaper priced model would have had all the same features. Fender guitar amplifier and effects modeling software with 45 models of amplifiers, cabinets, stompboxes, rack effects, and microphones macpc vst, au, rtas.
This book is a stepbystep tutorial for simulating vacuum tube guitar amplifiers using ltspice, a free spicebased electronic circuit simulator for windows and macos. Vacuum tube software the vtdata software package is a complete vacuum tube manual on your computer. Does anyone know if products exist that would allow me to input a tube amplifier design schematic, layout, selectconnect components, etc. Historically, simulation has not been used extensively in the vacuum industry, so i was nervous that there wouldnt be much interest in such a specialized topic. Well, radio building master greg charvat has you covered with his latest presentation, design your own vacuum tube audio amplifier. The main category is vacuum tube resources that is about vacuum tube, electron tube, thermionic valve, valve resources. I have always been interested in norman korens pages on using pspice to simulate an audio amplifier that uses tubes. Simulation program with integrated circuit emphasis. First, i have spent countless hours looking at the vacuum tube sites that currently exist on the web. The tube cad program has a circuit that uses a triode based pseudo ccs as the plate load for the amplifier tube. This is not a simulator, but a schematic capture and routing tool which i understand can integrate with spice. Optimize simulated circuit using new transformers, construct and test amplifier to create a more portable and affordable vacuum tube amplifier. Simulation of a giannini true reverber vacuumtube guitar. View all results for class ab amplifier at sweetwater the worlds leading music technology and instrument retailer.
Pdf wave digital simulation of a vacuumtube amplifier. Since the opamp output is at or near common potential, the vacuum tube pentode input stage is cathodebiased via r5 in the normal fashion. Figure 1 hybrid tubefet audio amp with active feedback. Also contains some vacuum tube models which drop straight on, and an example of a. Wave digital simulation of a vacuumtube amplifier conference paper pdf available in acoustics, speech, and signal processing, 1988. This link is listed in our web site directory since friday feb 9 2007, and till today vacuum tube software has been followed for a total of 9795 times. Id like to experience the great tube sound that audiophiles talk about.
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