REDD.51
1964 – 1968
Notable users
Abbey Road Studios, London (Studio 2 — entire Beatles catalogue Revolver/Sgt. Pepper era)
Technical specs
| Channels | 4 – 8 |
| Layout | Split |
| Groups | 2 – 4 |
| EQ | 2 – 3 band passive |
| Era | Early 1960s (Beatles studio era) |
| Topology | All-valve Class A, Neumann transformers throughout |
| Provenance | Never sold commercially — EMI in-house only (CRL Hayes) |
| Famous sessions | Beatles Revolver (1966) + Sgt. Pepper era |
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