no. and no that won't fix your problem.
large power cords are necessary to support relatively subtle improvments in sound. the amp will run fine on any power cord.
Jerry
10 gauge power cord. Too much power for tube amp?
Tube amplifiers tend to be sensitive on incoming voltages. Is there a chance a bigger gauge power cord like 10 gauge may not be a good thing?
My amplifier tends to shut down occasionally upon start up. maybe moving to a higher gauge might be better. Does it matter?