I took a look at the paper:
http://www.fender.com/support/amp_schematics/pdfs/Pro_Junior_Schematic.pdf
and it uses 2 6BQ5 power tubes, which gives you app. 12 watts of total power; not a lot for stage work unless mic'd. As for x-line level out, there are no built-in jacks. The only suggestion would be to use a y-connector at the amp's input, allowing you to use the Pro AND at the same time send the guitar's direct signal to a second amp. There is no extention speaker jack, as it's pointless with that low a power output and an 8 ohm minimum speaker load.
Basically what you have is a (mis-named) practice or beginner's amp. If you love the sound, mic it to get the volume up.
Good luck, Paul
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WUDAYAKNOW.. For the first time in my life, I'm wrong again!!
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