Volume 4

Linear Audio, your tech audio resource, continues to offer you stimulating, interesting and thought-provoking articles as well as projects you can build. Volume 4 is our 5th issue, and the first one that crept over 200 pages in size. Still no ads though! Subject matter includes triode noise, listening tests, tube and solid state phono preamps, SIT based designs, perception-based measurements, DAC design, PSU auditioning and supply decoupling. Don’t forget to visit the Online resources area on www.linearaudio.net for complementary papers and comments to articles. Happy reading, but don’t forget to listen to your music!

 

The case for subjective Listening Tests
Hans van Maanen

In his Guest Editorial, Hans van Maanen argues that although in theory decisions for audio development should be based on scientifically conducted controlled listening tests, there are many reasons why this in practice almost never happens.. Well-controlled tests are very difficult to organize and execute and the results are often ambiguous. On the other hand, there is a large body of subjective listening results and other circumstantial evidence for audible effects in audio equipment. Although not strictly ‘scientific’, when analyzed rigorously, this evidence can be used to determine promising avenues of development.
Volume 4

 

The “Terrible Twins” – a push-pull amplifier with solid state pentodes
Alfred Hesener

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Inspired by Nelson Pass’ work with Static Induction Transistors, and Lennart Jarlevang’s  experience with the PASS-SIT-1 in a single-ended configuration, Alfred Hesener decided to see how ‘pentode’ type solid state devices would fare in a push-pull arrangement. The article reviews design considerations and gives several tables comparing MOSFETs, BJTs and tubes on key performance figures. The article describes a complete design with performance data you can build. It uses just two devices in a push-pull arrangement, lots of iron and sounds quite good even without global feedback.

Volume 4

 

VinylTrak – A full-featured MM/MC phono preamp
Bob Cordell

altAfter spending many years to write an encyclopedic tome on audio power amplifier design, Bob Cordell decided to turn his considerable talent to the design of a phono preamplifier. Strictly solid state, his design using the best device for each position: jFETs for the input stages, BJTs for current sources and amplifying stages, and operational amplifiers for the output stages. Here, Bob proposes a different approach to achieve the 75uS hf RIAA roll-off that eliminates the cartridge electrical resonance and extends the electrical response well into the ultrasonic range. The design is single ended in and balanced out, and uses fully separate preamp channels for MM and MC cartridges.

Volume 4

 

A comparative overview of power supply regulator designs with listening tests
John Walton

altPower supply regulators for low power audio circuits have always been a source of controversy. Although technically almost flawless, there have been persistent reports about audible differences between designs. John Walton set out to clear that up, both by sophisticated measurements as well as controlled listening tests. He compared no less than 13 different designs. The conclusions he and his listening panel reaches are partly as expected, and partly total surprises.

Volume 4

 
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