Amplifiers not in daily use : Various power tubes

RCA 6SL7GT - RCA/Cunningham 2A3/45 // RCA/Cunningham 5Z3/80    ver. 04/25/2025

Siemens ECC801S - Siemens EL34 (triode connection) // Siemens GZ34    ver. 02/01/2023

16種の直熱/傍熱 三極管/多極管三結向け