
Two Virgins generally gets a kicking, but I think it sorts the men out from the boys (which is being kind to the men, admittedly). Particularly when armed with a knowledge of attic studio architecture, it's an entertaining listen. Anyway, besides the Mellotron, pianos and guitars, John's main allies in the war against sub-millionaire status were his tape machines; the Brenell Mark 5s (same model as above) captured nascent song ideas and long hours of amusing drivel. They were the state of the art home recording device of the time.
John, naturally, had a huge pile of other stuff up here, including his Farfisa Combo Compact organ (same model as below):

Julian Lennon bought much of the following Kenwood detritus (currently on display in Liverpool as part of the White Feather exhibition) at auction, including a tape machine, allegedly a part of the music room set-up, though it is conspicuous by its absence in the available pics. However, it's quite possible there was more recording equipment set up behind the photographer in the June '67 photos:

Thanks to Ron De Bruijn for the above pic.