Here's the deal. I have a '77 Fender Twin that puts out 135w across 4ohms and have recently acquired (for now) a 4x12 ext cab that handles 200w across 8ohms. I've been perusing the internet and read some stuff that says bad idea to combining these two. I dig the fuller tone and look of a raggedy fender stack but will i destroy my amp/cab? Thanks.
Well probably not the cab but hte head, mismatching ohms is a VERY bad idea...
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If you have two 4 ohm outputs, then you're okay. If you have two 8 ohm outputs, you'll probably damage the Fender cab.

Also, they won't sound 'right' unless you can play them both through the right output, and I highly doubt you'll be able to run a 4 ohm and 8 ohm cab from the same amp at once.
Or did I get that backwards? Plugging a speaker into a lower-ohm output causes decreased volume and headspace, but still works, right? Or is it the other way?