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.
I'm confused. Which amps are you referring to? Are these the ones he currently tours with? I was under the impression he toured with stock EC Twins. Please correct me if I am wrong.