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Circlotron otl amplifier for sale

Proudly present,the first amplifier to launch our of the new Ianus Series is our flagship of the Series, the Geminae. This is a Class A amplifier, using a floating circlotron using TriodeFet elements as output stage devices. Power delivery is W 8ohm W 4ohm while never leaving true Class A operation, even at very low loads. The active elements never go into cutoff even at full power at 4ohms.


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WATCH RELATED VIDEO: OTL Circlotron на живой акустике

100 Amplifiers – Part 3 , 1955 – 59


Here I am going to describe something about how we designed our unique OTL amplifiers. OTL amplifiers have always had a reputation for excellent sound, the idea to be able to remove the output transformer with its inherent imperfections in a tube amplifier make it possible to design an amplifier with very high bandwidth and stability even with relatively high level of feedback.

However, How do you really design an OTL amplifier with high reliability? Reliability is not what you spontaneously think about when you hear the acronym OTL. OTL amplifiers have often instead been synonymous with low reliability, using many tubes and very low efficiency. Use as few tubes as possible and don't overload them. Most commercial OTL amplifiers have many parallel connected tubes, sometimes 16 or even 32 in order to provide enough output power. These tubes have often been biased at maximum of their specification or even beyond that.

As it is difficult to get that many tubes that are closely matched, these amplifiers use unmatched tubes which are bound to have different performance and thereby draw different current so some live a very easy life while others are very overloaded from the start. When one of these overloaded tubes inevitably fails, the other tubes will also be overloaded and this start a chain reaction often taking out several or all tubes at one time.

To use matched tubes in a an OTL using 16 or more is not a practical solution, it is a monumental task to match 16 tubes close enough. A much better way is therefore to minimise the number of output tubes, To find a pair or a quartet of tubes that are matched is of course much easier than to find 16! Use the circuit with lowest output impedance. The solution for being able to use few tubes is both to find the circuit that can give the lowest possible output impedance and to find the most potent output tube available.

The OTL circuit giving the lowest output impedance is the so called inverted Futterman configuration which gives an output impedance which is less than half of the commonly used Circlotron. The most potent output tube available today at a reasonable price is the Russian 6C33C. This tube is able to withstand continuous anode currents of mA with peaks of more than 2. The first prototype OTL we designed with this tube is still equipped with the original 6C33C tubes which are still working well despite being used since We use Cloudflare and you can find cookie policy hier.

Website made by Tom Beijner. Design criteria 1: Use as few tubes as possible and don't overload them. Design criteria 2: Use the circuit with lowest output impedance The solution for being able to use few tubes is both to find the circuit that can give the lowest possible output impedance and to find the most potent output tube available.

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OTL amplifiers

David, aka Grumpy, needs our help. Great news. David is home! It was quite the ordeal to get him home and into the house, but it is done. Thank you to everyone for their support.

built 2 monoblocks, then a stereo circlotron amp using 6- tubes in to accomplish regulation so may have to buy a few and experiment.

Tube DIY Asylum


Posted by ojd A on June 05, at Has any inmate ever built or has experienced the sound of a circlotron amplifier? I know the Atma-Spheres are loosely based on the circlotron designs of EV in the fifties but I have never seen one or know of anybody who has either. They look realy interesting. Scroll down the webpage to find the schematics. But, high on my list of things to do for years now ; is to build an 'Iron Circlotron. A single power supply can run both channels of a stereo amp. There was a company in America that made a big name for itself selling iron Circlotrons with pentodes. Thiers were extremely complex, but the basic topology doesn't require it. I doubt whoever said OTL sounds like "a skeleton rather than a flesh-out human being playing your music" has actually done his audition homework properly????

OTL Asylum

circlotron otl amplifier for sale

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By Coytee , September 11, in Talkin' Tubes. None of them had the relaxed "presence" that the OTL had, even my wife and independent of her, her sister both, made comments while system was playing about how "real" it sounded.

circlotron OTL amplifier


Read times. Pages: 1 [ 2 ] 3 Go Down. OTL power amps, power and price. Quote from: jtwrace on 23 Oct , pm. Quote from: zybar on 23 Oct , pm. Clio09 Jr.

The story about the reliable low distortion OTL amplifier

User Name Remember Me? I guess I'll use this thread to plot my progress or regress as the project continues. One will be a lower power stereo chassis and the other will be higher power monoblocks. I am at a point now where the only thing left is to get the chassis made up so they will look professional. I am working out the final layout and drawings now and will hopefully have chassis in another month or so if funds permit. These amps are based on the Atma-Sphere designs with some popular mods and a few mods of my own. With 10 tubes per channel it should put out about 72 wpc into a resistive load at 8 ohms and a little over at 16 ohms.

With the astronomical prices copy for some tube OTL amplifiers: The Ultra-Mega use the cathode follower driven circlotron from the.

Atma-Sphere M-60 Mk. 3.1 OTL Monoblock Amplifier Review

Return to OTL Asylum. A salute to Dickie and Macovski Posts: Location: Texas Joined: December 6, Posts: Joined: April 19,

Review Summary Sound "An utterly clear and uncongested view into the music" -- "these amps breathed life into vocals"; "but this clarity and immediacy could be a double-edged sword" with less-than-perfect recordings; bass "certainly lacks solid-state weight and slam," but it "has punch. I would love to own separate systems that utilize each, but not because either is more accurate than the other. In general, I enjoy the sound of tubes more than solid state, but for reviewing, having a system that makes best use of solid-state amplification would be a wonderful tool. But there are factions within each of the larger categories, and I won't be wishing to have systems that conform to each of them. With over 25 years of experience designing and building OTL amplifiers under his belt, Ralph Karsten of Atma-Sphere is the dean of current OTL makers, and his designs are both old and new. The latter, as Doug Schneider and I found out when we visited Atma-Sphere, is the part of his design that Karsten considers his real achievement.

Here I am going to describe something about how we designed our unique OTL amplifiers. OTL amplifiers have always had a reputation for excellent sound, the idea to be able to remove the output transformer with its inherent imperfections in a tube amplifier make it possible to design an amplifier with very high bandwidth and stability even with relatively high level of feedback.

February World Premiere! Review By Dick Olsher. E ven 60 years after the concept gained some traction, the notion of an output transformerless OTL tube amplifier still seems mind blowing. Transformation of the high-impedance and low-current tube plate circuit into the high-current and low impedance needs of a loudspeaker appears to require the services of a good output transformer. Early OTL attempts were handicapped by low power and the need for a special high-impedance voice coil speaker.

Technical specifications and detailed information on the valve audio amplifier , including its development history. Valves also known as vacuum tubes are very high input impedance near infinite in most circuits and high-output impedance devices. The characteristics of valves as gain devices have direct implications for their use as audio amplifiers , notably that power amplifiers need output transformers OPTs to translate a high-output-impedance high-voltage low-current signal into a lower-voltage high-current signal needed to drive modern low-impedance loudspeakers cf.




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