7591 tube amp schematic software

Free schematic diagrams free electronics schematic diagrams downloads, electronics cad software, electronic pcb software, guitar wiring diagrams, tube amplifier schematics, electronics repair manuals, amplifier layout diagrams,pcb software for making printed circuit boards, amplifier design software cad for drawing circuit diagrams. Between the cathode of each tube and ground, install a 390 ohm 5 watt resistor. The 7591 s stay clean with tighter bass and a brighter top end. A well organized and easytounderstand approach to guitar amplifier repair covering. New amp designs using these reintroduced 7591 tubes.

Gamma network on input singleended classa tube amplifier design and construction. Theres more to marshall than just the iconic script logo. A williamson amplifier is a type of vacuum tube valve amplifier whose circuit design uses the same principles as a design published by d. If the tube is drawing the correct amount of cathode current the voltage across. One strange thing im trying to figure out is the bias. The guitar signal flows through the grid stopper resistor to the tube s grid, then out the tube. The tube amp library of information click the link above for tube amp info, schematics, board building information. Based on my experience with these amps, i think you are really going to like the sound produced by these tubes. These tubes have a slightly larger diameter than other el84 tubes so they can not be installed into some 90s era marshall dsl201 or dsl401 amplifiers, some 90s era reissue vox ac15 amps, and bad cat amps. Ozren bilan room acoustics audio site links audiologs. Ive never owned this amp, but, as you know it uses the 7591 power tube which was first introduced by westinghouse. Placechoose a device in the schematic window and simple move the mouse to the layout window to get the corresponding device design.

The following guidelines should be taken into account. Being a guitarist who shares that opinion, i chose to design a tube amp of my own. Aside from the ampeg geminis ive played with those tubes, the 7591 amp i spent the most time with was a real sweet old sano 2x12. The sooner you learn to read amplifier schematics the sooner youll be able to analyze classic amp circuits and learn how the masters of amp design voiced their amps. I feel if the 7591 tube were a car it would be much like the early late50s60s studebaker golden hawk. Either would require the construction of an adapter, or the replacement of the sockets in your amp. 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 tubes like pcl82, pcl84, pcl85, pcl86, ecl82, ecl84 or ecl86 can be used.

My mouser parts arrived today, and the st70 board went together in about 45 minutes. I have collected schematics from 1959 6v6gt, 1961 7591a, 1964 7591a and 1965 6l6. I have the photofact folder for the without amp should you want a copy of the schematic. The input network the input to the amplifier uses a resistive gamma network. Ive attached the schematic for the amp if thats any help. Anyway, been working on a 7591 pp amp build using mostly salvaged parts the transformers came out of an old hammond organ, of course. By trying out several different sets of operating conditions in the computer i could eliminate hundreds of possibilities without playing with electricity. Detailed information yellow jackets yellow jackets tube. In these calculations, 5% of the cathode current is assumed to be screen current. Tube amp schematics, tube amp information, tube amp projects.

I decided to build a premier twin 8 for a harp amp. Audio preamplifier circuits three transistor microphone preamplifiers. Very high transconductance, they bias kind of like an el84, plenty of headroom. Quick change from 7591 to 6l6gc or russian 5881 scott and fisher amplifiers on these amps the cathodes of the 7591as are usually tied together. I plan on replacing the filter caps as well as any other electrolytics. Get a low price and free shipping on thousands of items. Peavey amp schematics to assist you with your amplifier repairs and modifications. But its missing a tube for the tremolo, and i dont see any schematics for it on the amp or on the net. I needed to replace some 7591a vacuum tubes in two eico amplifiers. The vtl bias circuit is exactly what any guitar amp maker with common. And find a 7591 amp schematic to design your pioutput section. I am a frequent reader and very appreciative for this great site. I got the vr75 idea from an altec a340a amp schematic.

The biggest difference is the rectifier the schematic is drawn with a solid state diode rectifier in place of the 5y3 tube used in the day. Their height can still be an issue, though, as they measure 3 38 about 9 cm from the bottom of the base to the top of the glass. The combination of a beam pentodelike the 7591 which came at the tail end of the tube era, as well as a pentode front end end and poly capacitors makes this a fast and very detailed amp. Here weve listed our collection of guitar amplifier schematics. Stereo vacuum tube audio amplifier this simple stereo vacuum tube amplifier is using ecl parallel or pcl serial tubes.

This knowledge is then used to design an electron tube amplifier in the software tool ltspice. This project is about reaching into the past by doing an archaeological dig. The jj and eh were roughly similar for power output in this amp, though. Home amplifiers scott lk72 40 watt per channel 7591 integrated stereo tube amplifier preamplifier. Many variations of this model were offered by premier over many years, and this version utilizes a. Lets start by looking at the simple standard tube amplification circuit that you will see again and again as you study tube amp schematics. I put 10 ohm resistors from the cathodes of the 7591 s to ground, but i only get 110 the voltage i should at the 4 test points. Enter the finale f 7591 for round two in our little contest of small pentode against massive triode. If the amp has tubes usually 12ax7s with filament voltage sourced from this. Scott lk72 40 watt per channel 7591 integrated stereo tube amplifier preamplifier. Discussion in audio hardware started by retrosmith, jul 17, 2009. While the 7591 output tube is becoming more scarce and expensive, it is actually one of a family of three tubes with essentially identical characteristics. For those of you who still have old computers running windows xp 32bit or any other windows 32bit os, i have setup the download availability of my old old standards. Ratings are identical, and the only electrical differences are very, very minor differences in interelectrode.

To view this site, you must enable javascript or upgrade to a. Assembly manual schematic parts list tubes and applications design simulations. These two guitar amp output stage schematics are provided as examples of. The speakers will be ted weber 8inch 4 ohm alnico speakers. I found one that was reverseengineered, like mine, and happily, both of them match. Scott fisher pp 7591 6v6 6l6 el34 beam power tube amplifiers. Here youll find a modest collection of some interesting tube amplifier schematics. Before they came back around, i rebiased my ampeg gemini guitar amp in order to use the 7591xyz tube which, i believe, is the same as a 6l6 with the exception of being pinned for a 7591 socket. Find the wire connecting between the two cathodes and remove it. Jumping over several tube amp projects is this gem of a cl find. I have changed the series resistor at the top, since the last time i posted the schematic.

Vox ac10 10w 1x10 tube guitar combo amp musicians friend. If you see a problem with any of the schematics, please email me so i can fix the problem. A tube amplifier chassis contains lethal high voltage even when unpluggedsometimes over 700 volts ac and 500 volts dc. The original amp peg a mic connected to the top of an endpin for an upright bass and bassamp were first sold by michaelhull and its one of those amps that les paul recounts in the introduction to the book ampeg. If you have built any of these circuits, we would love to hear from you so send us your comments. Projects, mods, transformer diagrams, photos, sound clips. There are hundreds of pages of tube amp information on my library page. Sherwood s5500 schematic audiokarma home audio stereo.

If the bud box were just one inch deeper, i would have no reservations recomending this project to other audiophiles. I think i might start with a premier model 50 7591 circuit champstyle amp, i can get a schematic easily and there are lots of aficionados of these so its probably pretty accessible for my needs. The electro harmonix 7591a tube is smooth, yet punchy, with a sweet harmonix finish. Pp el34 tube amp schematic by mullard with dynaco a420 ef86, 6cg7 input. One suspicious thing ive noticed about the 7591 s currently in the amp is that one of. That means the schematic shown above is probably correct for all 6l6 based premier 50s later, in the 1960s, they changed the circuit when they adopted the 7591 power. Beans hard to find schematics these are redraws of schematics i have found from various places. Ive had a few hilgen amps come thru here that sounded like mini marshalls. Singleended classa tube amplifier design and construction. Ive never seen an official schematic for the premier 50. Cathode current milliamps displays approximate plate current after calculation.

Ampeg amp schematics to assist you with your amplifier repairs and modifications. Tube amp schematics index page there are over 3500 tube amp schematics and other types of schematics in the el34world schematic library. Most amps which take 7591 s are low profile and there is usually not enough room to fit any larger tubes inside the cover. If you are uncertain that you are experienced enough to work on a live high voltage amp, please take your amp to a professional to get it biased. The story behind the sound, where he was in a bad car wreck in the 40s which the amp survived. To view this site, you must enable javascript or upgrade to a javascriptcapable browser. Big red, a home brew 7591 pushpull diy tube amplifier.

The book walks you through the basics of developing a schematic, setting up a simulation, integrating vacuum tube models, and interpreting the results. Biasing an amp requires some knowledge of tube amp circuits and experience with high voltage. Getting started all the files at schematic heaven are in adobe acrobat form. Plate voltage dc voltage measured between plate and cathode. The ecc99 output tube idle at about 17ma and they do require the pearl audio tube coolers for actual cooling, not just tube envelope damping. Despite their best replication efforts, the consensus among performing and studio musicians remains that there is no substitute for a welldesigned tube amp. Discover your sound with our amps, combos, cabinets, fx pedals and more. Prowess amplifiers offers resources for the guitar tube amplifier builder. I put 10 ohm resistors from the cathodes of the 7591 s to ground, but i only get 110 the voltage i should at the 4. I am looking for a schematic for a sherwood s5500 amplifier. This amp has the 7591 output tubes that are horizontally mounted and 5 12ax7. Tubes with part numbers beginning with 7591 tube are in stock and ready to ship. Its deep as the internal hell, clear like tuned piano and makes a world of difference to enjoying music.

Reverbrocket schematic 7591a version r15r superreverb schematic. Oct 11, 2011 the largest difference from the transistor amplifier to the el34 tube amplifier is the bass. 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. They just arent suited to modern tube circuits that use both solidstate rectifiers and. This is our collection of diy and hifi audio schematics. Greetings from mostly a el34 lurker i have posted a few times. Please visit my tube amplifier forum heres the place you can go to ask tube amplifier questions. They contain preamplifier triode and power pentode in one tube. This video features a 1964 premier amplifier, made by the multivox corporation in manhattan, nyc. I am going to use a 7591 tube and use a schematic from 1964. 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. This allows on the one hand an easy integration of simulation tools and on the other hand a very comfortable schematic driven layout. If an amp builder doesnt want to sully the front panel, the least they can.

Get the guaranteed best price on tube combo guitar amplifiers like the vox ac10 10w 1x10 tube guitar combo amp at musicians friend. Antique radio forums view topic substitute for 7591 tubes. Tube bias calculator rob robinettes car and tube amp website. If there is interest, id be happy to post the revised schematics when the new pcb is done. There is also a huge library of effects and solid state schematics.

The 6v6s have more compression and less clean headroom,with a sweeter breakup. Altec lansing diagrams, schematics and service manuals download for free. The tube amp library of information click the link above for tube amp info, schematics, board building information, projects, mods, transformer diagrams, photos, sound clips. They made two versions of the amp, one with tone controls chassis v25122 and one without chassis v251014. The 7591 came near the end of the tube era and has a very modern sound, almost solidstate like.

These may be the best output transformers in the world you can buy. This tube is used in two of my ampsthe scott lk72b and the eico st40. If you have not been trained to work with high voltage then have an amp technician service your amp. Its much easier to analyze an amp circuit by studying its schematic. Its much easier to analyze an amp circuit by studying its schematic than looking at its layout diagram. At first glance, the finale f7591 looks like a basic tube power amp. Schematic for the amplifier, omitting power supply ii. There is a reason why the mcintosh 225 sounds amazingly good thanks also to the 7591 tube well good iron too.

Oa2 voltage regulator tube as shown on the gibson ga30rvt schematic. If you need a guitar amp schematic for your amp repair that is not listed here, contact us and well try to locate it. In this paper the underlying technique of electron tube amplification is investigated to give an insight in how a common electron tube amplifier works. As this section is responsible for a huge amount of trafic each month ive decided to run a few ads here to help cover the costs. It sounds like a truly great ss amp that gives up the bottem end punch ss can deliver, but more than makes up for that with a mid range that is wonderful. Vintage sano tube amplifier 50 watts ebay item 150476536124 end time aug1510 15.

The result is the best el84 tube currently produced. Yellow jackets tube converters allow el84 power tubes to be used in place of the. Almost identical circuit to the el84 amp, except output tube is a single ended 6v6gt. Substitutes are given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. Homemade el346ca7 push pull tube amplifier with diy ultra linear hifi output transformers.

Feel free to send us your hifi audio schematics and we will add them here. Coupled amp will get the longest life of any tube amp from tubes but the sonics are a matter of taste with some listeners. A trio of software programs for the intrepid tubephile. Its not to everyones taste, but after restoring a couple scott 299cs and 299ds, i knew i really liked the 7591 and wanted to build an amp using them. Research shows the amp is rated at 30w, using two sylvania and rca 7591 power tubes, and two 12ax7 preamp tubes that look to. Amplifier schematic diagrams software free download. Free altec lansing diagrams, schematics, service manuals.