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. 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. Theres more to marshall than just the iconic script logo. At first glance, the finale f7591 looks like a basic tube power amp. Jumping over several tube amp projects is this gem of a cl find. The story behind the sound, where he was in a bad car wreck in the 40s which the amp survived. This tube is used in two of my ampsthe scott lk72b and the eico st40. This video features a 1964 premier amplifier, made by the multivox corporation in manhattan, nyc. A well organized and easytounderstand approach to guitar amplifier repair covering. I am going to use a 7591 tube and use a schematic from 1964.

Enter the finale f 7591 for round two in our little contest of small pentode against massive triode. 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. Free altec lansing diagrams, schematics, service manuals. If the tube is drawing the correct amount of cathode current the voltage across.

These two guitar amp output stage schematics are provided as examples of. Its much easier to analyze an amp circuit by studying its schematic. Tubes with part numbers beginning with 7591 tube are in stock and ready to ship. 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. If you need a guitar amp schematic for your amp repair that is not listed here, contact us and well try to locate it. If you have built any of these circuits, we would love to hear from you so send us your comments. 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. There are hundreds of pages of tube amp information on my library page. I also agree its wise to stick with a tried and true circuit, no doubt i have zero chops to design my own lol. This amp has the 7591 output tubes that are horizontally mounted and 5 12ax7.

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. 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. This allows on the one hand an easy integration of simulation tools and on the other hand a very comfortable schematic driven layout. The input network the input to the amplifier uses a resistive gamma network. Getting started all the files at schematic heaven are in adobe acrobat form. This is our collection of diy and hifi audio schematics. The speakers will be ted weber 8inch 4 ohm alnico speakers. Singleended classa tube amplifier design and construction.

Vacuum tubes like pcl82, pcl84, pcl85, pcl86, ecl82, ecl84 or ecl86 can be used. If there is interest, id be happy to post the revised schematics when the new pcb is done. Schematic for the amplifier, omitting power supply ii. 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. 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. 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. Plate voltage dc voltage measured between plate and cathode. Please visit my tube amplifier forum heres the place you can go to ask tube amplifier questions.

Detailed information yellow jackets yellow jackets tube. 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. Big red, a home brew 7591 pushpull diy tube amplifier. Here weve listed our collection of guitar amplifier schematics. They contain preamplifier triode and power pentode in one tube. Amplifier schematic diagrams software free download. 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. If you have an amp using 6v6s do an ab with jjs and either nos or the new tung sol 6v6. Feel free to send us your hifi audio schematics and we will add them here.

Based on my experience with these amps, i think you are really going to like the sound produced by these tubes. Pp el34 tube amp schematic by mullard with dynaco a420 ef86, 6cg7 input. So youll need to download the free adobe acrobat reader via the link below to be able to view schematics. In this paper the underlying technique of electron tube amplification is investigated to give an insight in how a common electron tube amplifier works.

Sherwood s5500 schematic audiokarma home audio stereo. They just arent suited to modern tube circuits that use both solidstate rectifiers and. If the amp has tubes usually 12ax7s with filament voltage sourced from this. Home amplifiers scott lk72 40 watt per channel 7591 integrated stereo tube amplifier preamplifier. Tube bias calculator rob robinettes car and tube amp website. By trying out several different sets of operating conditions in the computer i could eliminate hundreds of possibilities without playing with electricity. Altec lansing diagrams, schematics and service manuals download for free. Homemade el346ca7 push pull tube amplifier with diy ultra linear hifi output transformers. Ive never seen an official schematic for the premier 50. I have changed the series resistor at the top, since the last time i posted the schematic.

But its missing a tube for the tremolo, and i dont see any schematics for it on the amp or on the net. They made two versions of the amp, one with tone controls chassis v25122 and one without chassis v251014. Beans hard to find schematics these are redraws of schematics i have found from various places. The result is the best el84 tube currently produced. The 6v6s have more compression and less clean headroom,with a sweeter breakup. This book is a stepbystep tutorial for simulating vacuum tube guitar amplifiers using ltspice, a free spicebased electronic circuit simulator for windows and macos. Tube amp schematics index page there are over 3500 tube amp schematics and other types of schematics in the el34world schematic library. As this section is responsible for a huge amount of trafic each month ive decided to run a. I am looking for a schematic for a sherwood s5500 amplifier.

A tube amplifier chassis contains lethal high voltage even when unpluggedsometimes over 700 volts ac and 500 volts dc. My rca tube manuals for 7591a says the grid resistor should be less than 300 k ohms with fixed bias, fisher 500c and others used a higher value and should be changed, but that can have an effect on the sound, so ive been told. In these calculations, 5% of the cathode current is assumed to be screen current. There is a reason why the mcintosh 225 sounds amazingly good thanks also to the 7591 tube well good iron too. Scott lk72 40 watt per channel 7591 integrated stereo tube amplifier preamplifier. The tube amp library of information click the link above for tube amp info, schematics, board building information. Stereo vacuum tube audio amplifier this simple stereo vacuum tube amplifier is using ecl parallel or pcl serial tubes. Its much easier to analyze an amp circuit by studying its schematic than looking at its layout diagram. 7591, a tube i dislike personally, but even so tube life is generally. Cathode current milliamps displays approximate plate current after calculation. Here youll find a modest collection of some interesting tube amplifier schematics.

Ampeg amp schematics to assist you with your amplifier repairs and modifications. Many variations of this model were offered by premier over many years, and this version utilizes a. I needed to replace some 7591a vacuum tubes in two eico amplifiers. Oa2 voltage regulator tube as shown on the gibson ga30rvt schematic. These may be the best output transformers in the world you can buy. 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. I plan on replacing the filter caps as well as any other electrolytics. There is also a huge library of effects and solid state schematics. A trio of software programs for the intrepid tubephile. 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. Discover your sound with our amps, combos, cabinets, fx pedals and more. Tube amp schematics, tube amp information, tube amp projects. Reverbrocket schematic 7591a version r15r superreverb schematic.

Ratings are identical, and the only electrical differences are very, very minor differences in interelectrode. Coupled amp will get the longest life of any tube amp from tubes but the sonics are a matter of taste with some listeners. 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. If you have not been trained to work with high voltage then have an amp technician service your amp. Get the guaranteed best price on tube combo guitar amplifiers like the vox ac10 10w 1x10 tube guitar combo amp at musicians friend. 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 feel if the 7591 tube were a car it would be much like the early late50s60s studebaker golden hawk. 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. I decided to build a premier twin 8 for a harp amp. We stock current production 7591 and 7868 tubes for your vintage audio amps. 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. The vtl bias circuit is exactly what any guitar amp maker with common.

If the bud box were just one inch deeper, i would have no reservations recomending this project to other audiophiles. If you see a problem with any of the schematics, please email me so i can fix the problem. Find the wire connecting between the two cathodes and remove it. Yellow jackets tube converters allow el84 power tubes to be used in place of the. Prowess amplifiers offers resources for the guitar tube amplifier builder.

Its deep as the internal hell, clear like tuned piano and makes a world of difference to enjoying music. Ive attached the schematic for the amp if thats any help. Research shows the amp is rated at 30w, using two sylvania and rca 7591 power tubes, and two 12ax7 preamp tubes that look to. Almost identical circuit to the el84 amp, except output tube is a single ended 6v6gt. Discussion in audio hardware started by retrosmith, jul 17, 2009. The guitar signal flows through the grid stopper resistor to the tube s grid, then out the tube.

Vox ac10 10w 1x10 tube guitar combo amp musicians friend. Assembly manual schematic parts list tubes and applications design simulations. The 7591 came near the end of the tube era and has a very modern sound, almost solidstate like. Gamma network on input singleended classa tube amplifier design and construction. The jj and eh were roughly similar for power output in this amp, though. Either would require the construction of an adapter, or the replacement of the sockets in your amp. New amp designs using these reintroduced 7591 tubes. I have collected schematics from 1959 6v6gt, 1961 7591a, 1964 7591a and 1965 6l6. The following guidelines should be taken into account.

If an amp builder doesnt want to sully the front panel, the least they can. One strange thing im trying to figure out is the bias. This project is about reaching into the past by doing an archaeological dig. 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. 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. Anyway, been working on a 7591 pp amp build using mostly salvaged parts the transformers came out of an old hammond organ, of course. Oct 11, 2011 the largest difference from the transistor amplifier to the el34 tube amplifier is the bass. Between the cathode of each tube and ground, install a 390 ohm 5 watt resistor. 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.

Ive had a few hilgen amps come thru here that sounded like mini marshalls. 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 ecc99 output tube idle at about 17ma and they do require the pearl audio tube coolers for actual cooling, not just tube envelope damping. My mouser parts arrived today, and the st70 board went together in about 45 minutes. And find a 7591 amp schematic to design your pioutput section. Scott fisher pp 7591 6v6 6l6 el34 beam power tube amplifiers. Biasing an amp requires some knowledge of tube amp circuits and experience with high voltage. One suspicious thing ive noticed about the 7591 s currently in the amp is that one of. This knowledge is then used to design an electron tube amplifier in the software tool ltspice. Ill be adding more brands and schematics in the near future.

To view this site, you must enable javascript or upgrade to a. Greetings from mostly a el34 lurker i have posted a few times. Audio preamplifier circuits three transistor microphone preamplifiers. 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. Very high transconductance, they bias kind of like an el84, plenty of headroom. Projects, mods, transformer diagrams, photos, sound clips.

The electro harmonix 7591a tube is smooth, yet punchy, with a sweet harmonix finish. 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. Being a guitarist who shares that opinion, i chose to design a tube amp of my own. The 7591 s stay clean with tighter bass and a brighter top end. Ozren bilan room acoustics audio site links audiologs. Get a low price and free shipping on thousands of items.

The book walks you through the basics of developing a schematic, setting up a simulation, integrating vacuum tube models, and interpreting the results. 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. I found one that was reverseengineered, like mine, and happily, both of them match. We have a huge schematics inventory, projects section and forum. I have the photofact folder for the without amp should you want a copy of the schematic.

Placechoose a device in the schematic window and simple move the mouse to the layout window to get the corresponding device design. Antique radio forums view topic substitute for 7591 tubes. Peavey amp schematics to assist you with your amplifier repairs and modifications. Guitar signal shown in pink enters the tube on the left at ac signal in. Most amps which take 7591 s are low profile and there is usually not enough room to fit any larger tubes inside the cover. To view this site, you must enable javascript or upgrade to a javascriptcapable browser. I got the vr75 idea from an altec a340a amp schematic. Vintage sano tube amplifier 50 watts ebay item 150476536124 end time aug1510 15. It have to be experienced as a description is far from enough compared to feeling it in your chest. A williamson amplifier is a type of vacuum tube valve amplifier whose circuit design uses the same principles as a design published by d. Despite their best replication efforts, the consensus among performing and studio musicians remains that there is no substitute for a welldesigned tube amp.