Re: Describe the overdriven tone from these Fender amps...
Tweed. Fat bottom, honkin midrange, creamy top end. The most Marshally of Fenders. Very woody sounding gain. Think Buddy Guy, Gibbons, Clapton.
Browns. Looser bottom, sort of like a gainier blonde, a little more ragged on the top end. Like an unrefined and grittier Blackface OD tone. I can't think of anyone who's got that sound to use as an example.
Blonde. A little saggier and warmer sounding than Blackface, and the best example is all the 60's Surf music and Brian Setzer. Sounds a little farty when overdriven, at least to me, so they sound best with teles and Gretschs, which don't push them too hard. They sound better as a pushed clean amp.
Silverfaces were made to be loud clean amps, but ironically most of them had a master volume. The problem is that it's not a gainy amp, so it just sounds blatty when you try to coax OD out of it. They should only be used as clean amps, IMO.
Blackfaces were intended as pure clean amps, but the point where they begin to overdrive is actually pleasing to most, especially with single coils. Tweeds have a woody crunchy OD, but Blackfaces have a glassy bubbly OD with a lot less midrange.....more bass and treble. Think of Eric Johnson's clean tones and SRV's early recordings for blues OD.