Replacing TDA2030a with TDA2050 in parallel

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Depends on the load impedance for 8 ohms you should be able to get the magic 100W with +/-22v supply but for a 4 ohm load you should use +/-18v to get 100W
I would not run them for long at that level because the To220 package does not have the area to get rid of the heat easily!
One way around this is to build the "superbridge" in the TD2030A data sheet which has booster transistors that take some of the power dissipation.
 
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