Can I connect two half stacks together ?

Try here: https://www.manualslib.com/manual/491791/Ibanez-Tone-Blaster-100r.html

Probably on the inside.

Some hopefully easy fixes : Input jack could be the problem, or connection from the amp to the speaker. Does the speaker hum a bit with the volume up almost all of the way without anything plugged into the unit? If not, check the connection from speaker to amp.

If it does hum slightly when u crank the volume, check your input jack -- it might be jacked up (pardon the pun) and you can fix that easily by soldering in a new one.

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any input jack should work!

Sounds like a problem with the channel itself, if the clean channel works then its not the lead, input, guitar or the drivers. You have to be careful when opening up amps as some can hold a residual charge and there can be danger of electrocution.

I would recommend getting it looked at by a pro, it doesn't sound like an expensive fix.

Most common cause would be failed filter capacitor(s). Broken grounds neaar the input connector are another common problem. This will take electronic troubleshooting skills.

There is no basis for that theory.

Start by getting the tubes checked.

This is exactly how any 2 pickup, 2 volume, 2 tone, three way switch guitar would be wired from the factory. Best of luck!

http://www.seymourduncan.com/support/wiring-diagrams/schematics.php?schematic=2h_2v_2t_3w