Results of his output transformer research were published at aes conventions in. See my book modern highend valve amplifiers based on toroidal output. Toroidal transformer is not always better, it depends on other factors. Krell ksa100 arguably, the first highend solidstate superamp. The weakest point of an tube amplifier are the output transformers. Thoroughbred horse racing playing for profit by ray taulbot.
Rw20 is r core audio output transformer for single. Some use modern plastic bobbins and some use paper bobbins. The wide bandwidth toroidal pushpull output transformer 6040. Pdf building valve amplifiers download full pdf book. The majority of output trannys were the minimum size, made. A valve amp using toroidal speaker output transformers.
Aes elibrary universal system and output transformer for. Pdf download audiophile vacuum tube amplifiers volume 3. The basis for the creation of the whole fezz audio project is a family business known as toroidy. Subject index and experitriental investi gation of, 2317 selfsaturating, tinme constant of, 2318 subminiature, a. As designer of the new widebandwidth toroidal output transformers plitron. The unit is based on 4x el84 output tubes, and one ecc83 driver tube. Fezz audio are based in poland and make the fezz audio silver luna valve amplifier. If you require further info please send me a message. Toroidal transformers have two major problems regarding noise. The product is enclosed in the square case on the left.
The use of toroidalcore output transformers, developed by the author over the past 15 years, has contributed to this revival. Motorboating was a problem throughout the era of vacuum tube electronics but became rare as vacuum tube gear was replaced in the 1970s with modern solid state designs, which are directcoupled. The circuit is designed by menno vanderveen, and the published in his book modern highend valve amplifiers based on toroidal output. Probably his bestknown work is his book, modern high end valve ampli. The first problem is the extremely low leakage inductance of even a sloppily wound toroid. Z amps use heyboers as do many other high end builders. There the resistors r5 and r6 perform the same trick. I also read that most receivers, even bigticket models. Menno vander veen modern highend valve amplifiers based on toroidal output transformers elektor electronicspublishing dorchester,england. The right on the photo is the r core output transformer in bare condition. Imagine an output transformer in a push pull or single ended valve amplifier.
The wide bandwidth toroidal pushpull output transformer. The majority of output trannys were the minimum size, made from the least expensive materials. Whether you are into the clean, free spirited single ended tube output or high efficiency, high power, pushpull audio, we have the output transformer for you. Everything else being equal, it does offer some advantages e. Aes elibrary signal level and frequency dependant losses. Low level audio signal transfer through transformers conflicts with permeability behavior. Hiend power and output toroidal transformers by toroidy. Frequency domain calculations for toroidal output transformers. The toroidal transformers have almost perfect magnetic properties and dont have an air gap. Valve amplifiers download ebook pdf, epub, tuebl, mobi.
Vacuum tube guitar and bass amplifier theory, tino. Vacuum tube guitar and bass amplifier theory, tino zottola. Oct 08, 2015 toroidal transformer is not always better, it depends on other factors. Tube output transformers aesthetics we have also paid close attention to the look of our units as they are as much on display in some designs as the tubes themselves.
The circuit is designed by menno vanderveen, and the published in his book modern high end valve amplifiers based on toroidal output transformers. The schematic diagram of a valve amplifier often appears to be very simple at first glance, but anyone who has built a modern valve amplifier knows that a lot of critical details are hidden behind the. The 3db frequency range 55 the lower 3db frequency 57 the upper 3db frequency. He wrote over 360 articles for various dutch high end audio magazines and is the author of the book transformers and tubes. Based on toroidal output transformers book online at best prices in india on. The circuit is designed by menno vanderveen, and the published in his book modern highend valve amplifiers based on toroidal output transformers. Even now tube amplifiers still sound great perhaps better than ever before. Figure 1 shows several pushpull tube amplifiers only the power tubes and the output transformers. I also read that most receivers, even bigticket models, cant spare enough internal real estate to house humongous transformers and hefty power supply capacitors that powerhouse amps need. The last decade has seen a growing microsoft equation editor pdf interest in valve amplifiers, which is not only due to. Build vanderveen 70 and 100 watt single channel amplifiers. The recent resurgence in popularity of traditional tubetype audio equipment in guitar amplifiers and home audio systems has led to a reappearance of.
Measuring output transformer performance plitron manufacturing. Frequencydomain calculations for toroidal output transformers. Marantz and denon no longer use toroidal power in their. Abstracts and references the design fea tures are discussed of a pushpull amplifier using a pair of type5881 tubes in the output stage to feed a general radio type942a toroidal output transformer. The first tube amplifiers were constructed with triodes, directly coupled to high impedance loudspeakers, with interstage transformers, but without output transformers. Amplifier circuit details are available in chapters 54, 66 or 67, 69 and 95. There are also high end gear that dont use toroidal transformers. Explains the whys and wherefores of toroidal output transformers at various technical levels, starting with elementary concepts and culminating in complete mathematical.
Based on the rejection of amplified radio frequencies at the control grid, the. Feb 15, 20 todays receivers may be jampacked with the latest technology, but it seems they they lack the muscle of high end power amplifiers. Explains the whys and wherefores of toroidal output. The modern high end valve is in great condition strictly collection from delivered anywhere in uk or i can possibly deliver depending on your location. For valve amplifiers we make a range of mains transformers, output transformers and chokes. Pdf building valve amplifiers download full pdf book download. Abstracts and references the design fea tures are discussed of a pushpull amplifier using a pair of. Audiophiles, guitarists and general hobbyists alike will find this book an invaluable source of detailed information on transformers, rectifiers, smoothing, high voltage. Our high fidelity units are manufactured with high grade laminations m6 and machine wound with high quality copper wire. The ten most significant amplifiers of all time the. The schematic diagram of a valve amplifier often appears to be very simple at first glance, but anyone who has built a modern valve amplifier knows that a lot of critical details are hidden behind the apparent simplicity. The year was 1980 and who would know that the ksa 100, right outofthebox, would establish krell as one of the greatest brands of all time. Because our main goal is not a cost, but quality, we chose the toroidal transformers because of their unparalleled sonics, low distortions, and 3d sound qualities. For high end audio amplifiers we make low noise transformers and transformers using mumetal laminations.
The power tubes have an effective total internal resistance ri and. Vacuum tube amplifiers need an output transformer as impedance converter between the high impedance vacuum tubes and the low impedance loudspeaker. Modern high end valve amplifiers based on toroidal output transformers. Everyday low prices and free delivery on eligible orders. Valve amplifiers are regarded by many to be the ne plus ultra when it comes to processing audio signals. Modern highend valve amplifiers based on toroidal output transformers, pages 1523. Whitaker, television receivers, mcgrawhill professional, 2001 isbn 00780426. Results of his output transformer research were published at aes conventions in 1994 and 1998. Subject index and experitriental investi gation of, 2317 selfsaturating, tinme constant of, 2318 subminiature. The transformers that have been used in these proofofconcept products were 4x the toroidal speaker output toroidal transformer, of the expo series, and a supreme series unit as the toroidal power transformer, with a power handling cabability of 250va. The modern highend valve is in great condition strictly collection from delivered anywhere. What resistance should the resistors r1 and r2 have in the ul40s2. Menno vander veen modern high end valve amplifiers based on toroidal output transformers elektor electronicspublishing dorchester,england. This ebook pdf explains the whys and wherefores of toroidal output transformers at various technical levels, starting with elementary concepts and culminating in.
The plitron patpcb1 is designed for use with the pat4004 or pat4006 output transformers. Modern high end valve amplifiers based on toroidal output transformers, pages 1523. This, together with the fact that the flux stays within the core, helps to reduce leakage, distortions, greatly minimizes losses, and offers better coupling. The demand for greater output power led to paralleled triodes and triodes in pushpull configurations with balanced output transformers. The combination of classical technology and modern components has resulted in a revival of the valve. Matching the valve and transformer impedances 52 5. Todays receivers may be jampacked with the latest technology, but it seems they they lack the muscle of highend power amplifiers. The use of toroidal core output transformers, developed by the author over the past 15 years, has contributed to this revival. He is the designer of special toroidal output transformers for tube amplifiers in close cooperation with plitron and amplimo.
The transformers that have been used in these proofofconcept products were 4x the toroidal speaker output toroidal transformer, of the expo series, and a supreme series unit as the toroidal power. These are discussed extensively, in connection with designs for amplifiers without output powers ranging from 10 to 100 watts. Exploring vanderveen trans tube amplifiers amazon s3. Based on toroidal output transformers, elektor international media, 1999 isbn 0905705637. Designing power supplies for valve amplifiers is a unique guide to the operation and practical design of linear power supplies, especially for valve equipment. Dan dagostino proved to the world that solidstate output devices could actually reproduce music. Marantz and denon no longer use toroidal power in their high. Modern highend valve amplifiers based on toroidal output transformers. Signal level and frequency dependant losses inside audio signal. The combination of classical technology and modern components has resulted in a revival of the valve amplifier. Universal system and output transformer for valve amplifiers. Tube amplifier circuit board plitron manufacturing.
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