The new “blackface” joined the rest of Fender’s new “blackface” line, so called because the amps had black faceplates, black knobs, black handles and black tolex covering.
Fender added a silver grill cloth to give this line a new, high contrast look.
The Champ had the lowest power output and the simplest circuit for all of the Fender tube amps.
The Champ had only one power tube, which meant that the circuit is single-ended and class A.
Instead, there were approximately 2000 of these chasses produced, which then ended up as one of the three models in question.
Five watts and the simple toneful circuit allowed the Champ to be used easily and often in recording studios. Front" style cabinet; the 800 was covered in greenish fabric while the 600 featured two-tone blonde and brown vinyl covering.
(with 8" speaker), changing a year later to "Champion 600" (6" speaker) with circuit designation 5B1. This style lasted until 1953, when Fender's cabinet style changed to the "Wide Panel" design with a tweed cloth covering.
Silverface amps are cleaner and don’t distort as much.
For the most part the differences between blackface and silverface amps are subtle.