[Arran]

Article or not, inverter or not, if it's made in China it's made to fail. Why they need to get an inverter involved for a 110 to 12 volt AC power supply is beyond me, but being China built it's almost guaranteed to be trash can bound, the fact that it does not even have a manufacturer's name tells you something. I would just salvage a proper mains transformer from something else if you want one to lower line voltage by using the low voltage secondary.
Speaking of line voltage in the case of an AC/DC series string set they were designed around a working voltage of 117 vac, I don't know where this 110 volt idea came from, the only true 110 volt mains they had was DC mains, which likely does not exist anymore anywhere.
In an AC/DC series string set you usually have three 12.6 volt tubes, a 50 volt, and a 35 volt which comes to 122.8. If it's something less it will have a resistor in series with the tube filaments to make it add up to 117 volts, where you could easily add a larger power resistor to make it add up to 121 volts or whatever your line voltage is. A few volts extra on the B+ side does not matter much.
Regards
Arran