🇬🇧 EMI

REDD.51

1964 – 1968

Notable users

Abbey Road Studios, London (Studio 2 — entire Beatles catalogue Revolver/Sgt. Pepper era)

Technical specs

Channels4 – 8
LayoutSplit
Groups2 – 4
EQ2 – 3 band passive
EraEarly 1960s (Beatles studio era)
TopologyAll-valve Class A, Neumann transformers throughout
ProvenanceNever sold commercially — EMI in-house only (CRL Hayes)
Famous sessionsBeatles Revolver (1966) + Sgt. Pepper era

Market value

Not on the open market (EMI never sold REDDs)

Rarity

Holy Grail (never commercially sold)

Valve Class A Neumann transformers Beatles Revolver era Abbey Road only

The REDD.51 was EMI's response to the demands of four-track and ultimately eight-track recording — a larger, more flexible valve console that maintained the essential REDD character while providing the routing complexity that increasingly ambitious pop production required. The Beatles' middle period — from Help! through Revolver — was recorded primarily on REDD.51 consoles, and the sonic transformation between those records and the REDD.37-era output is audible to trained ears.

Notable Recordings

  • The Beatles — Help!
  • The Beatles — Rubber Soul
  • The Beatles — Revolver
  • Pink Floyd — early sessions

Studios

  • Abbey Road Studio Two, London