I know ancient post but this is not correct information so I feel compelled to correct it, the amp Richie is talking about Eric hated instantly and never used, it was a brown with a brown panel, the wrong amp. After that, I built as requested 3 low power Tweed Twins while at Fender which Eric happily used for over 2 years. These amps were a copy of the amp Cesar Diaz modified for him, basically a low power tweed Twin but made to be more reliable so they could handle the road abuse. Everything about those amps was custom including custom wound output transformers and 200 year old pine. They started to sound fuzzy to him after a few years because they had the wrong preamp tubes in there (12AX7 instead of 12AY7) and is when he switched to Cornell, after the mistake was discovered he continued to use them some more. Again the amp Richie was talking about was made by someone else and he never used it. There is a post from the sale of two of those amps in this thread and I see one still has the wrong preamp tubes in it ;-)Ritchie Fliegler explains Eric Clapton's Tweed Twin:
RF: ...Clapton’s amp was modified, like that means better than the way it was. That thing was a mess. The transformer set is like from a 1978 Super Twin, with two CTS speakers out of a 100 watt Bassman – a '73-74 type of thing. That was it. That’s Clapton’s amp. Clapton loves that amp. It’s one of those things that you’ll hear, “Hey, Clapton’s amp was modified." I guarantee you that if someone came to me and said, “Hey man, I want you to modify my amp,” and I say, “Great, I’ll put in this 1978 Super Twin transformer set and two speakers from this 100 watt silverface Bassman,” that’s not what they’re talking about. They want the full snake oil treatment. So when he wanted a spare for it because he absolutely loved the sound of that amp, we made him another one exactly like it. We found a used Super Twin and we took the transformer set out of it. We bought a 100-watt Bassman for $50 from someone who was about to throw it in the garbage. We cleaned the caps up and threw it in there and he said, “Yeah, that’s it – that’s great!”and we would all kind of laugh and send it on its merry way.
TQR: I was told by somebody that particular amplifier was a mid '50s Twin which had two rectifier tubes and two 6L6’s, and the two rectifier tubes were taken out of the socketry wiring and four 6L6’s were put in.
RF: That certainly sounds legit. I’ll buy that, but I don’t remember.