Studer J37 four track tape recorder
Having only four tracks did not limit their recordings; by using a multi-channel mixer several parts could be recorded to one channel. This however meant that processing (like compression and equalisation) would have to be applied during recording, as the tracks could not be separated once recorded. Also, before the recording commenced, a thorough sound check was required to be sure the correct volume levels were archived.
The main console was designed and built by EMI. It essentially contained two 5-channel mixers, a valve equalisation section and effects sends. This allowed for multiple channels to be sent to one track of the Studer, with equalisation and other effects added on the way in. At present Mark Knopfler and Lenny Kravitz own such a console.
Beatle albums made using the Studer J37 four track recorder:- Help! (1965)
- Rubber Soul (1965)
- Revolver (1966)
- Sgt. Pepper (1967)
- The Beatles (1968) (in part)
(NB Also a Telefunken 4-track recorder was used).