This is interesting and I had believed this bit of info for years. But in recent years I've read accounts of the recording sessions and it seems that fact cannot be confirmed. I read that two new SF Fender amps were purchased for the session, a Champ and a Princeton IIRC. Further, there was not a clear answer as to what amp was used by whom for which tracks. A Tweed Champ does seem plausible, but doesn't seem to be part of the history according to those who were there. Still remains as a credible mythology!