Powered by a pair of EL-84 output tubes, a dual 12AX7 tube preamp, and a 10-inch Fender Special Design speaker with vintage cone; the Pro Junior III will deliver slabs of classic Fender tone.
The Tweed Pro Junior was laso featured in a 1993-dated UK ad for the Fender Tweed Series amps, so I assume it was first introduced in the latter part of that year.
Generally speaking, most of the stuff on this site can be applied the Hot Rod Deville, some of this can be applied to the Blues Deluxe/Deville, and very few of it can be applied to the Blues Junior or Pro Junior.
They may be a part of the "Hot Rod" lineup, but internally the BJ and PJ are totally different amps.
The reverb driver and recovery are also solid state, but use a real spring reverb pan like those found in Fender's more expensive amps. Both the reverb and effects loop use the same type of high quality op amps.
The signal path itself (preamp/poweramp) A lot of people have heard that the More Drive is solid state, or that it uses solid state components.