Well the recommended power supply for that truer (from towers recommendation) has 11.5 amps. So a 14 amp supply should run it. But I have seen converted computer power supplies do strange things before. A freinds pc supply would not run his Triton charger if you turned on the charger with the supply running... it shut it down... but if you hooked up the charger and turned it on and then turned on the supply it worked fine
Why don't you ask some one with a non converted power supply if you could hook up your truer to see if it works.