Vol 2 is our third Volume, and has again a mix of technologies and subjects.Bob Cordell is back with a very high quality KT-88-based tube power amplifier.Rudolf Moers goes on an ultra-linear adventure. If there was ever anything you wanted to know about the design, advantages and trade-offs in ultra-linear tube power amps, this article will surely answer it.On the solid-state front, Kendall Castor-Perry designed a novel and ingenious gain-of-one power output stage that needs no adjustments or thermal compensation yet is extremely linear, even open loop. Our friend from Switzerland, Samuel Groner, came up with an equally high-performance push-pull transimpedance stage that could drive Kendall’s output stage, or any other, for that matter.Nelson Pass has a sequel to the Arch Nemesis, transplanting the SiC power device with a custom-designed Static Induction Transistor, the Pass SIT 1. Marcel van de Gevel describes a simple loudspeaker correction filter that gets away with standard value capacitors and a simple gain-of-one buffer amp as the active element.Patrick K (aka as EUVL), inspired by designs from Nelson Pass, Marshall Leach and others presents a minimalistic I/V converter for current output DACs based on jFETs and a floating power supply.Stuart Yaniger shares with us some interesting insights and experiences related to controlled listening tests.Last but surely not least, Gary Galo’s Guest Editorial provides a thought-provoking insight into the history, development and current state of digital audio.The 2nd part of Scott Wurcer’s microphone preamp had to be postponed and can be found in Vol 3.There are also two book reviews: Rudolf Moer’s Fundamental Amplifier Techniques with Electron Tubes is reviewed by Guido Tent, while Kendall Castor-Perry gives his views on Douglas Self’s latest work The Design of Active Crossovers.Enjoy!

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