The Unison S6 has a specified power consumption of "265 VA max." Given that it is a class A design that probably means a continuous draw of not a great deal less than 265 watts, which in turn is not greatly less than the 320 watts drawn by the LM-518ia.
An EL34 requires close to 10 watts just to heat the filament, and I'm guessing that in this design each of the six EL34's consumes something like 25 watts in total. So that's 150 watts just for the power tubes, plus additional consumption by the power supply, the small signal tubes, and other circuitry.
I don't have a solution to propose, but as Charles and I stated earlier perhaps the answer involves going to a less powerful amp than the ones that have been mentioned.
Good luck. Regards,
-- Al
An EL34 requires close to 10 watts just to heat the filament, and I'm guessing that in this design each of the six EL34's consumes something like 25 watts in total. So that's 150 watts just for the power tubes, plus additional consumption by the power supply, the small signal tubes, and other circuitry.
I don't have a solution to propose, but as Charles and I stated earlier perhaps the answer involves going to a less powerful amp than the ones that have been mentioned.
Good luck. Regards,
-- Al