Here's the written Stereophile report by Ken Micallef...
https://www.stereophile.com/content/borderpatrol-and-triode-wire-labs-feature-new-zola-dac-and-living-voice-speakersBorderPatrol and Triode Wire Labs feature New Zola DAC and Living Voice speakersKen Micallef Nov 20, 2025
Gary Dews of BorderPatrol Audio Electronics and Pete Grzybowski of Triode Wire Labs are old hands at audio shows, yet they bring the zeal of energetic newbie pups. Then again, there's nothing "newbie" about Dews's new BorderPatrol Zola DAC ($3950).
"The Zola DAC features the vintage Analog Devices AD1865 R-2R chip (often called the analog chip)[footnote 1], operating in non-oversampling, no digital filtering (NOS) mode," states the website. The AD1865 was discontinued in 2009, but it's still widely used, for example, in some Audio Note DACs. "The DAC features a tube output stage that uses a 5687 double triode," Border Patrol continues on their webpage. "The DAC has fully independent power supplies to the digital and analog sections. Both supplies feature tube rectification. The high-voltage tube supply uses choke input filtering. The casework, other than the aluminum faceplate, is made from copper. It has inputs for USB, coaxial S/PDIF and TosLink. A BNC S/PDIF input is also provided. The DAC will replay files up to 32-bit/384kHz via USB, 24-bit/192kHz via coaxial S/PDIF/BNC and 24-bit/96kHz via TosLink."
Beyond the DAC, the system included a BorderPatrol S20EXD 16Wpc parallel single-ended 300B tube power amplifier ($22,500) and a pair of Living Voice R80 OBX loudspeakers ($56,300/pair).
Grzybowski's Triode Wire Labs cables included a Freedom ethernet cable with Telegärtner RJ-45 connectors ($249 each), Spirit II RCA interconnects, with hybrid material design utilizing Ohno Continuous Cast 7N copper ($399/pair), American biwire speaker cables with TWL jumpers terminated with premium Cardas CAB bananas ($1099/pair), The Obsession NCF audiophile power cord with Furutech FI-50 NCF connectors ($1499 each), High Power Digital American II power cords ($749 each), and Digital American II power cords ($549 each).
For years I've covered Gary and Pete's rooms with Greg Roberts's Volti Audio loudspeakers. Their electronics sounds just as good with the British-made Living Voice loudspeakers. The solo bass of Kham Meslien's album Ta Confiance fired with natural drive; the massed strings of Mahler's Symphony No. 2 in c, "Resurrection," conducted by Otto Klemperer, held together beautifully even when volume hit peak levels; the acoustic folk of Dave's True Story's "Like a Rock" provided toe-tappin' goodness within a wide soundstage, pure tone, and accurate fake handclaps. Well done, maestros Dews and Grzybowski.Footnote 1: It is not the only "analog chip," however. Another discontinued R-2R chip—the Philips TDA1543—is also popular among designers of a certain sort of D/A processor. Computer Audio Design—CAD for short—uses 16 of them in parallel and even named its DAC after the Philips chip: In its current iteration, it's the CAD 1543 Mk.III—Jim Austin
Thanks, Ken!
Cheers,
Pete