Home of ultrafidelity DIY tube audio amps and high sensitivity point source speakers, the famous netsite is back by popular demand, offering in-depth discussion, schematics, plans and advice.
JUTE ON AMPS
DIY TUBE AMPLIFIERS AND SPEAKERS
"wonderfully well written and reasoned information
for the tube audio constructor"
John Broskie TubeCAD & GlassWare
"an unbelievably comprehensive web site
containing vital gems of wisdom"
Stuart Perry Hi-Fi News & Record Review
TUBE/VALVE AMPLIFIERS BY ANDRE JUTE
THE KISS AMP 300B project is an attempt to take the tube amp designer by the hand and lead him through all the highways and byways of designing an ultrafi amp, including the thought processes, the math and the development. It is half-engineering course, half metaphysics, half bloodyminded prejudice and alltogether infuriatingly complex because the simplicity of KISS has a very high price. It has its own index page for the text and another for the illustrations. You will find the majority of the most useful core articles in the old Jute on Amps site in The KISS Amp 300B files, rearranged and rewritten to make the interdependence of tube design decisions manifest.
'Minus Zero' This is my T68bis 417A single tube micropower single ended amplifier, one-third watt to drive horns as in the T91 HWAF3 below. For the T68bis you need three files: photographs with notes and circuit schematic and basic layout and wiring suggestion.
Jute-EL34-SEntry.jpg An inexpensive single-ended triode-linked EL34 amplfier to drive The Impresario, a Lowther horn speaker, or a Voigt Pipe also called a TQWP for tuned quarter-wave pipe or tapered quarter wave pipe
T39-KISS-300B-Ultrafi-crct.jpg The KISS Amp 300B 'Ultrafi' circuit. Two-stage, all-triode, single-ended, zero negative feedback, ultra-silent tube amplifier with Western Electric WE417A high-mu triode and WE300B DHT, Mullard GZ37 tube rectification, with twin-choke smoothing (zero electrolytic capactiors, of course!). This is also the control amp (think of a 300B pre-amp) which boosts my 75W SE SV-572-xx amp into life. Extended description in THE KISS AMP 300B.
T44bis-'Populaire'-crct.jpg The T44 from my old Modular Tube Amplifier Series 300B "Lundahl" brought up to date and redesigned to be a stereo amp. This is the standard of a silent single-ended directly heated triode 300B amplifier. Extended description in THE KISS AMP 300B.
SPEAKERS BY ANDRE JUTE
JUTE on BESSEL How to build a high quality virtual point source speaker or stereo array from cheap drivers each operated at low power in its most linear region.
OTHER AMPLIFIER CIRCUITS ON THIS SITE
we91Roberts.jpg Joe Roberts's classic WE91 adaptation to be built from scratch
300Bfiprimerclassic300b.jpg J C Morrison's WE91 adaptation with direct coupled input
FleshBloodFig1.jpg Herb Reichert's simpler WE91 adaptation to achieve the same silence
CAN A TRANSISTOR BE MADE TO SOUND LIKE TUBE AMP?
KISS 191A by Andre Jute An inexpensive opamp amplifier with minimum parts count that sounds good and has further potential
KISS 191B by Andre Jute Developing the amp in KISS 191A to sound like a 300B for a fraction of the cost
KISS 191C mGBschem.jpg The opamp circuit for the miniGainBrick Zip LM675
KISS 191D mGBmatr.jpg A layout suggestion for the miniGainBrick Zip LM675
KISS191E NoBleed.jpg Living dangerously!
Reviews of books of interest to audiophiles and DIYers with an emphasis on tube-related material
THE OUTER EDGE
Is the DIY DAC an Audiophile Ecstasy or an Audiophool Extravaganza? Thinking blocks, stumbling blocks and the best components identified.
A superb direct coupling scheme by Anthony Mills. Also as a pdf: TheMillsConnection.pdf
Interesting circuits, questions and sometimes even answers.