The overall tone is ok but they can sound boxy and small and for this reason many guitar players write off the pro junior as a non gig worthy amp.
Pro junior cabinet upgrade.
We ve always felt that the biggest limitation to the pro junior was the 1x10 particle board cabinet.
Features the pro junior iv features a 15 watt tube circuit driven by a pair of el 84 power tubes and two 12ax7 preamp tubes with a solid state rectifier.
The fender pro junior is a great sounding little amp and our 1x12 pro senior cabinet upgrade is a mod that will really open up the tone and make your pro jr.
The resonance and sonic size of the amp is vastly improved.
These features truly earn the pro junior iv its pro title.
This larger cabinet actually weighs less than the smaller stock cab due to pine and birch construction so even if adding a heavier speaker.
Fender ships the pro junior iv with groove tubes so you don t need to budget for a tube upgrade.
I used to prefer the 65 princeton cleans to the pro junior but after this upgrade i have not played my princeton at all.
From the factory the pro jr should have came with either an 8 speaker like a high powered champ or came in the blues junior box and the the blues junior should have either came with a 10.
In this case i feel like a 10 would sound spectacular in a blues junior cab whereas the 12 speaker never quite does it for me in a blues junior.