Thermionic Culture The Swift

Controls: Shelving Bass & Treble lift/cut (2 frequencies each), passive Mid Cut & Lift (4 frequencies, 3 Q settings), Presence switch, Air control, switchable High Pass Filter, Gain switched in 0.75dB steps, Bypass

Notes: No dedicated numeric spec-sheet PDF was found for this model (only a manual + recall sheet) — frequency_response/impedance fields left blank rather than estimated; page states qualitatively 'frequency response from below to well above human hearing with minuscule phase shift' and can output +20dBu without noticeable distortion. Design references a 1950s EMI desk Baxandall EQ and a Pultec-style passive mid section, plus a Presence circuit designed by founder Vic Keary in 1963. Country confirmed: 'lovingly hand-made and tested in Harlow, England.' Official site thermionicculture.com is currently unreachable/broken (root returns an empty Apache directory listing, product URLs 404) as of research date 2026-07-19; all data below sourced from Wayback Machine snapshot dated 2025-05-16 (and linked official spec-sheet PDFs) of the live Joomla/VirtueMart catalog, cross-checked against the current Independent Audio (US distributor) product listing, which also shows no USD pricing.