Astell&Kern SP4000T + Clarus IEM Launch — Quad Vacuum Tube DAP & Tribrid Flagship Debut at High End Vienna 2026
🏷 TL;DR — Astell&Kern SP4000T + Clarus IEM Launch Together SP4000T: A&ultima flagship DAP, industry-first Quad vacuum tube design (RAYTHEON JAN6418 MIL-Spec) with independent dual-tube…
