Have to start again as a new topic as the existing one has refused several times to accept any new comments.
Reading the previous views I took out my elecronic stereo LP of Dennis Brain's famous Mozart horn concerti recording and compared it with the current Great Recordings of the Century CD. I have to say I preferred the LP as I found the orchestral sound somewhat harsh and agressive on the CD, not evident at all on the LP. There is though little evidence of any "stereo effect" on the LP.
One of the best Decca Eclipses is of Rossini overtures with the teenaged Piero Gamba (then known as Pierino) conducting the LSO (not to be confused with his later true stereo Lp of more Rossini). The performances are absolutely electrifying and the brilliant sound almost approaches that of a true Decca stereo Lp. There is a definite spacial true stereo effect and I have wondered if there was some early two channel experimentation as it was made in 1956 when Decca were making stereo masters. The record label however clearly states it is a reprocessed mono recording. The 'cello solo opening Wm Tell is glorious and only Decca could have produced such a rip-roaring rasping from the trombones in the storm: a fabulous record in every respect.