813 tube amp schematic software

The rigs swr protection circuit winds back the output so much that it is not possible to get. Tube amp dontcrack audio plugins software downloads. 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. The gm70 and the 8 with graphite plate are not very good so you should use only copper plate for the gm70 and metal plate for the 8 fu shuguang. The rig runs a pair of 8 s in the final, modulated by a pair of triodeconnected 8 s, and is based on the k1jj design. Maybe youve been curious about really big single ended power tubes.

However, it would be beneficial to extend that coverage to 40 if at all possible. Wingfoot 8 plate and platescreen supply circuit description and. Im planning to build a linear based on two 8 valves in parallel and in the traditional groundedgrid configuration. Charlie originally planned for the transmitter to cover 160 and 80 meters. The 2x 8 linear amplifier mike bohn, kg7tr 20 april, 2016. The sound this plugin produces varies from a mild warm overdrive to a fuzzy distortion. Also, later this evening ill see if i can rework the schematic a bit to include a. The 8 is a good general purpose beam power tetrode and used to be popular with amateurs in the old days as a power amp valve. I had pretty much all the components needed in a box of junk. The amplifier employs a pair of gl8 tubes in a neutralized pushpull circuit. Sometimes i get excited about my latest circuit and after looking for just the right tubes, output transformers, coupling caps, and low noise resistors, the power supply design becomes almost an after thought.

It uses a single pentode as the driver a 12hg7 video amp tube, and a solidstate power supply with a microprocessor controller. Instead, i am going to try a little known, but apparently very efficient circuit known as a bifilar tuned input circuit. People such as zl1axb, and joby, n5apr get watts output from a pair of 8 s using this circuit. Jan 06, 20 a low cost 600 watt ultralinear amplifier for 40, 20, 17, 15, 12, and 10m this compact little amplifier is the brainchild of pat murdoch, zl1axb, in auckland, new zealand. The plate and platescreen supply provide the plate and screen voltages needed by the 8 tube. The shishido wavac 811a tube amp schematic in the photo above, the kairo modified schematic and gantis schematic in the photos below. Having recently been commissioned to design and build four 1kw tube amps, yes four, i decided to use four of the classic 8 tubes rather than. After much thought the decision was made to use a single 8 beam power tube wired in the not so famous g2daf configuration. Copy any of this at your own risk the cct is derived from a number of sources but with added innovation. The spice model i developed for the 8 see above seems to match reasonably well the hand plotted curves.

Hello, all you highpowered tube amp maniacs out there. A low cost 600 watt ultralinear amplifier iw5edi simone. You can glean some info from previous triode 8 gg amp designs. There has been many 8 amplifier articles written over the years in a half a dozen radio magazines and this one is not much different except for some outback engineering and humor in building it. Here are a few pictures of my four 8 s desktop g2daf amplifier built about 18. This amplifier uses a pair of 8 beam power pentode tubes. If the bud box were just one inch deeper, i would have no reservations recomending this project to other audiophiles. About homebrew 8 linear amplifier the resource is currently listed in in a single category. The 8 is a generalpurpose transmitting beam power tube with thoriatedtungsten filament with a maximum plate dissipation of 125 watts. The arrangement affords near maximum power tube utilization with moderate plate voltages. The availability and proven dependability of the 8 make a pair of them the logical choice for the kilowatt. Jul 15, 2017 i ran across a schematic for an amp using an 8 tube. As a single 8 linear it had allowed me to test acquired 8 tubes.

This update adds reports for the kt88 version of the matrix amp and for the 8 version of the matrix amp. As you can see, this is a typical 8 amplifier schematic with the exception of the input circuit. Marcellino, w3bym 806 parkland drive, rockville, md 20853 this project began in the summer of 1981 at a hamfest held at. In most respects it is a typical grounded grid linear amplifier, with the exception of.

I just finished an pair of 8 pp 100 watt mono blocks. Diy audio projects forum 8 pp amp 100 watt rms output. Circuit description and schematic diagram power supply photos. Here are a few pictures of my four 8 s desktop g2daf amplifier built about 18 years ago while living in the outback here in australia. The 2x 8 linear amplifier mike bohn, kg7tr 20 april, 2016 introduction the 2x 8 homebrew linear amplifier shown in figure 1 was constructed to complement my octal tribander transceiver described elsewhere on the website. As regards the preamp stages, once again i think the schematic s are very self explanatory. Warning if you are not a qualified technician please do not attempt any repair you are not confident with. With plate dissipation of watts they are not as rugged as some more expensive tubes. I dont always spend as much time on my power supply designs as i should. Here is a link to a basic schematic, but you will need to change the output tuning to a pinet.

If you didnt wish to include the very frontend and tone circuits, then you just simply stop at preamp schematic number two and your input is as a slaveamp would be. I would like to make a compact single tube amp for 16040 if i find an old rca tv transformer. Champ 1,000 watt tube amplifier vintage amp repairs. A multiband grid tank allows the input circuits to be permanently shielded and. This is a singleended triode amp that i built using the 8 transmitting pentode, connected as a triode. As long as the circuit diagram is closely followed, this tube amp should work. Welcome to steves vacuum tube related web site jacmusic. Wingfoot 8 circuit description and schematic diagram.

A high output linear amplifier dwight borton, w9vmq w9vmq outlines his experiments with a screen grid driven linear amplifier possessing high plate efficiency and excellent linearity. They are physically smaller than the 8, and have a 5v filament drawing 6. Electrically, the amplifier is very similar to the. The 3500z is a relatively inexpensive tube and has been around for a long time. How to build the dx811a allband linear amplifier cq. Wingfoot 8 amplifier main page and front and side views. I had to make a socket for my first 8 amp as i had just one. The main peculiarity of the amp circuit, i guess, is the singletube pentode driver. Here are some interesting schematics for the 811a tube. The main category is amateur linear amplifiers that is about hf amplifiers for ham radio use. I have changed the series resistor at the top, since the last time i posted the schematic. How to build the dx811a allband linear amplifier cq magazine september 1982 by f. The aa8v wingfoot 8 amplifier high technology of the 1950s in the 2000s by dr.

Looking at the loadlines you can easily get 20w at 1. Provision has been made for convenient changing from one mode to an other as well as to any of the bands from 80 through 10 meters. This tube amplifier uses the dual triode 12ax7 tube to first amplify the small signal. All of this data was used as background for the design of the 2x 8 amplifier described.

The aa8v wingfoot 8 amplifier high technology of the 1950s in the 2000s by. The algorithms behind a vva are based on real vacuum tube circuits and nonlinearities, mathematically simulating the largesignal transfer functions. Assembly manual schematic parts list tubes and applications design simulations. My own designed phase splitter circuit ecc81 and directly coupled cathode. I had to compromise the thd throughout the audio spectrum rather. Power required to drive an 8 in grounded grid linear. Maximum ratings in linear amplifier service qrz forums. This amplifier without modifications will allow to use the gm70 and the 8 fu output tubes. In my amp the 8 was triode strapped thanks for the curves and running. A trio of software programs for the intrepid tubephile. Note the size of this amp compared to the cigarette packet. Its much easier to analyze an amp circuit by studying its schematic than looking at its layout diagram. Greg latta circuit description and schematic daigram.

This applies the full output of the bias supply to the 8 grids to cut the tube off. 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 wanted to have a small but nice sounding tube power amp that i can use with my preamps and pedals. The circuit requires no bias or screen voltage and the low control grid. As promised, ive added matrix amplifier information. It is the same physical size and features identical styling. Lets start by looking at the simple standard tube amplification circuit that you will see again and again as you study tube amp schematics. You can rightclick this graphic and select open image in new tab or save image as to make it easier to access while looking at the schematics below. And maybe youve seen these amps on ebay but didnt want to wait forever to get one. A virtual valve amplifier vva is software algorithm designed and sold by diamond cut. Tube amp is an audio effect plugin that applies asymmetric tube triode overdrive usually found in single tube microphone pre amp boxes. More details of this part of the circuit are found on the 8 input circuit page. The gm70 and the 8 fu in a direct comparison with the 845 have the same sound quality but these tubes have the great advantage of a higher voltage gain to allow an simple driver stage.

After many years designing single ended amplifiers i have decided to start a series of test about the push pull amplifiers. Not only does it do the job it looks the biz with its bright yellowwhite filament. Leistungsstarker kwpa mit 400600 watt senderleistung. May 17, 2015 ive been running 2 years now with the 814se a2 amp so if you are interested on alternative topologies for a2 operation then you can read some of that here. Each tube has an anode dissipation of 500 watts, 20watt grid dissipation and plate voltage up to 4000 volt. Still no majik smoke, and the diodes giving a nice purple glow.