For giggles can you bypass the add-on rectifier and try the AC side only with the 6011?
If it still acts funny then my bet is that the selector switch is corroded up. There are How-to instructions on the web on how to clean this switch. Most parts are still available from Lincoln if you were to need any, but you usually do not need any. Usually some fine sand paper and scotch brite pad is all you need after some switch disassembly. Would we worth your time to try it.
For a replacement welder (which is very unlikely) then I would go either either Hobart Stickmate or Miller Thunderbolt (they are same welder actually). There is even a bigger version that is available over the standard 230AC/160DC output model if you willing to spend extra $.
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