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Soldering iron or hot air rework station?

I need advice from my friends into building electronics. I have grown frustrated with years of using $8 soldering irons from Radio Shack and want to get into a Weller or Aoyue soldering station. My quandary is deciding between just a soldering station or a hotair rework station. My next two projects will be 1) replacing some bad caps on a circuit board and 2) resoldering some bad joints on another board.

I’m currently looking at the Aoyue 937+ Digital Soldering Station and the Aoyue 968 SMD Digital Hot Air Rework Station. Suggestions? Feedback?

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Is 9V too much for a 6V device?

If I have a device that requests 6V input and I have an a/c adapter that outputs 9V, will the device draw only the 6V it needs or will it try to take all 9V and burn itself out? In this case the circuit is simply a light. It has the switch and the bulb with an optio of being powered by 4 AA batteries or 6V input. No amp requirement specified.

Watt’s it matter?