Purpose of noise inverter????

[miniman82]

If you don't run it on a variac or isoformer that has a voltage switch, it probably does run hotter. Remember that our line voltages can sometimes be much greater than the 117VAC specified by old sets, that extra voltage translates into more heat being dissipated by heaters and deflection circuits which is why I'm very adamant on people running at 117 input volts and making damn sure the HO tube cathode current is as low as possible.