Newly discovered Beatles proto amp – summary/overview


Beatles amp on ’66 tour, © Beatles Book Photo Library

Newly found Swiss chassis/amp

Just to summarise where we are with the research so far;


Lower edge of Swiss amp today, placed just above same section of Beatles tour amp in 60s below, photo © Beatles Book Photo Library




  • A NEWLY DISCOVERED AMP CHASSIS from Switzerland has been found to match one used by the Beatles, in Germany, on the 1966 tour (seen in photos above).
  • It matches and helps to explain the different construction of the Beatles proto amps.  Much bigger transformers, cut-out corners, same legends, exact same proto diamond pattern/styling on front (though Paul’s had a BASS legend added on the top front panel).
  • Despite the switches being swapped and the power socket turned and re-attached, The same marks can be seen in many areas.  These include not just scratches/gouges revealing bare metal, but subtler, more complex sub-surface damage and radiating cracks to the enamel, that become more visible with certain angles/lighting.
  • One lower transformer bolt in particular on the new Swiss amp was re-drilled, markedly higher and to the left, while the top bolt above used the pre-drilled hole.   This is matched by the Beatles amp.
  • The newly-discovered chassis was drilled in production with a larger hole for a different power socket, but then fitted with an Amphenol socket, which barely had enough metal to securely fasten a bolt.   This weak and compromised setup broke with some knock, and the connector had to be turned from its normal upright position with the connector and red circle on top, to try to fasten it again.  This problem, leading to a power connector oddly-turned round from normal upright position,  can also be seen on a second amp used by the Beatles on the same tour.  It seems the chassis on at least two amps was drilled the same way, with a bigger hole, leading to some failure of the connection.  This then led to the power socket having to be turned to try to make a more secure connection.
  • Here are some of some of the most obvious corresponding matched details;
  • Only one of the lower bolts visible over lower bar of removable back section; lower bolt is raised and moved left, bolt above in normal pre-drilled hole.   © Beatles Book Photo Library

compare with;

Only the top left bolt uses pre-drilled hole; the others have had to be re-drilled. Lower left bolt isn’t just shifted left, but also shifted higher.  Same anomaly, same bolt, shifted in exactly the same way, higher & left, as on the Beatles amp.



Beatles amp (Black & White) top, © Beatles Book Photo Library.  Modern-day Swiss amp below. Complex of marks under Amphenol, particularly downward line and ‘V’ shape



Scroll down for full comparison/details in the previous posts, or follow these links;


Swiss amp = Beatles amp; photo comparisons  part 1

Swiss amp = Beatles amp; photo comparisons  part 2

early chassis found -investigation   part 1

early chassis found   part 2

early chassis found  part 3 

early chassis found  part 4





Newly discovered Beatles proto amp – summary/overview | 2018 | Uncategorized