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how to set up slave amp setup?

you can if the one amp has a pre amp output and the other has a power amp in.

but why 2 heads to run one cabinet? usually 2 amps are used to run more cabinets for volume.

unfortunately tube amps have to have a load on them even if using just the pre. so it defeats the purpose.
both amps would need a speaker load attached.

one heck of a heavy preamp.
 
I think what he wants is to get his favourite tone through a bigger amp.

You could with my Mesa amp, it's got a speaker line out that can go into a slave amp to run more cabs, key point being at least two cabs in use or the two half cabs in B-string's example.
 
It would have to be something like an 810 that has separate inputs for the top 4 10"s and bottom 4 10"s. YOU MUST NEVER CONNECT the outputs of two tube amps together, or SS amps, or a SS with a tube amp.
I've read there was a Marshall amp or two that were built like that. Tube amp transformers can be paralleled on primaries, secondaries or both, or bridged. SS bridged only, parallel would be bad.

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Never tried it myself.
 
I've read there was a Marshall amp or two that were built like that. Tube amp transformers can be paralleled on primaries, secondaries or both, or bridged. SS bridged only, parallel would be bad.

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Never tried it myself.

You can indeed do as you suggest but the amps have to be identical and designed with the required operation in mind. Using common bass amps, it's not a good idea.