Hello everyone! I am new to this forum and I am the owner of Ray Butts's EchoSonic #27. It has never been modified and works well. After a bit of internet research, it may have been possible that Ray had kept a card file with details on each amp he made. Does anyone have any information on the year of this amp, who bought it, date of purchase, etc? I am posting here as the Echosonic was resold under the Rickenbacker name in the 60s, so I hoping someone could shed some light on these rare amps and the technology in them. I was told that #27 may have been Ricky Nelson's amp but that is as of yet unconfirmed. This amp has some issues - is there a schematic and/or parts list available for reference? I can be reached at echosonic27 at gmail dot com. Any information on this historical amplifier would be greatly appreciated. Thank you!