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Once upon a time, all audio equipment used vacuum tubes. In recent years, however, tubes have become the exclusive province of super high-end audio. It is more expensive to accomplish any particular task with tubes than with transistors, and few manufacturers (with the exception of Conrad-Johnson) seemed willing until now to refine their techniques and pare back their budgets to make tube components more affordable.

Chopin; Nocturnes
Arthur Rubinstein, piano
RCA Victor LSC-7050 (2 LPs) (reissued on CD as RCA Victor Red Seal 0902 663049-2). Max Wilcox, prod.; Tom MacCluskey, Sergio Marcotulli, engs. Recorded August 30–September 2, 1965, 2 February 21, 1967.

If these Nocturnes are never played better than this, we couldn't care less. These are exquisite performances!

The recording, via RCA Victor's Dynagroove process is a far cry from the earlier excesses that gave Dynagroove its horrid reputation among perfectionists. One is simply not aware of the recording at all, as long as it is played at the right volume, which is about what you would hear from a good first-balcony concert-hall seat.

A stunning jazz discovery presented at a historic citadel of recording technology. That event took place June 11, when the new John Coltrane recording, Both Directions at Once: The Lost Album, which will be released June 29, was unveiled at Van Gelder Studio, the fabled location where the celebrated engineer recorded many jazz masterpieces.

Lovers of high-resolution multichannel sound still don't have it easy. While the two-channel market is replete with snazzy, efficient music servers in stylish boxes, the only multichannel equivalents are Merging Technologies' Merging+Player Multichannel-8, and a handful of stereo devices that are rumored to do multichannel, though no such claims are made in print. To be candid, the latter will play multichannel tracks via USB, Ethernet, or HDMI outputs to suitable DACs (but that's another story), but because they're aimed at the two-channel market, they tend to skimp on the CPU horsepower and RAM needed to handle higher-resolution multichannel files. Even the Merging+Player Multichannel-8 ($13,500), with its Intel i3 CPU running Roon, couldn't entirely keep up with everything in my library.

First there was the epithet, "Notorious RBG," which NYC law student Shana Knizhnik coined in 2013 (in a sly riff on the name of Supreme Court Justice Ruth Bader Ginsburg's fellow Brooklynite and rapper, The Notorious B.I.G.) as the name of her Tumblr site. Then came Derrick Wang's, Scalia/Ginsburg, an opera based on the odd-bedfellows friendship of two SCOTUS justices and opera lovers from opposite sides of the political spectrum, Ginsburg and Antonin Scalia. This year has already brought the next two artistic steps in the process of honoring the 85-year old Supreme Court justice: the documentary RBG and, from Cedille Records, Notorious RBG in Song.

On the second morning of a recent audio show, I walked into the exhibit room of Bricasti Design.

"How about some Mahler?" asked cofounder and designer Brian Zolner.

"Oh God. Not at 10am!"

Twenty-five years after the premiere of John Adams' Violin Concerto, the music remains as vital, exhilarating, and strangely moving as the day it was birthed. An extremely demanding work, its three contrasting movements present a triathlon challenge of sorts to anyone who dares try to play them.

Here, she who rises to the challenge is violinist Leila Josefowicz. Provocatively pictured on the CD cover as a curious cross between an athlete in repose and Rodin's reflective thinker...