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Absolutely not! #12 wire will is not rated for the amperage required. If you were to use the #12 (if your electrical requirement is for #6 or #8), you would have a fire. As a "rule of thumb":
#12 for 20A circuits
#10 for 30A circuits
#8 for 40A circuits
#6 for 50A circuits
#4 for 60A circuits
#2 for 100A circuits
There are other "variables/factors" to consider: length of run (voltage drop), conduit, wire type (Romex, THHN, etc), etc. THHN/THWN is what is recommended for hot tub installations. So if, for example, you have a 40A hot tub that calls for #8AWG, that is the minimum - and often it is advisable to upsize one size (to #6), etc. If your hot tub is 50A you would use #6 (or possibly #4).
: Any expert--- can I use #12 wire doubled in lieu of #6 or #8. I already
: have the wire in conduit and cannot re-wire with the larger gauge.
PLEASE NOTE: We are Roberts Hot Tubs Inc. (manufacturers of traditional wooden hot tubs)! If you found this webpage through a search engine while searching for a different brand of spa, we are not them! We simply appeared in your search due to that name being talked about on this particular web page. The phone number below will reach Roberts Hot Tubs, not the manufacturer of the brand of spa you're searching for. This is a public forum and you're more than welcome to post a question asking for contact or other information for a particular brand of spa. Almost certainly someone will be able to assist you.