OVERVIEW: The T Mk 6 Fanfare is a U.S.-developed towed acoustic decoy system deployed by surface ships to counter acoustic-homing torpedoes. It replaced the earlier Foxer system, emitting propeller-like noise to draw torpedoes away from the vessel.

DETAILS: Developed shortly after World War II, Fanfare generates acoustically realistic propeller sounds, a marked improvement over the broadband noise of Foxer. The system comprises dual noisemakers towed off the stern via winch-mounted cable drums, stabilized with fins to maintain depth and trajectory. It remained effective against mid‑20th‑century torpedoes and achieved widespread service through the 1970s before being superseded by more modern systems like AN/SLQ‑25 Nixie .

“T Mk 6 Fanfare” is the U.S. Navy designation; no other variants are documented it succeeded Foxer and was not part of a series.

FUNCTION: When under torpedo threat, the ship deploys Fanfare units via stern winch so that they trail behind on cables. The decoys emit propeller-like acoustic noise to lure torpedoes toward the decoy instead of the ship, effectively shielding the host vessel.

NOTE:
IOC: Late 1940s–1950s (post-WWII deployment)
Operators: United States Navy; exported to allied navies including Indonesia (Fatahillah-class corvettes), Greece, Pakistan, Egypt

Platforms: U.S. destroyers and escorts; Indonesian Fatahillah-class corvettes; Greek Charles F. Adams-class destroyers (e.g., Daring/Kimon); Pakistani Gearing-class destroyers (Tariq‑class); Egyptian Knox-class frigates (Damiyat-class)

SOURCE:
Wikipedia – Fanfare (decoy): https://en.wikipedia.org/wiki/Fanfare_%28decoy%29 ; Navypedia – corvettes/destroyer decoy fit listings; cmano‑db listing T Mk 6 Fanfare (weapon #1340); QuestionAI/engineering topics “T‑Mk 6 Fanfare” info