[morzh]

Well, think of it this way: the equivalent of what you do by adding a 23 Ohm resistor in the primary is top add more or less 210 Ohm resistor in both halves of the centertapped winding of the rectifier circuit, if your half-winding to primary ratio is about 3:1. (300V)

Is it good? Never tried, but my gut feeling, a bucking Xcfmr is better, as it does not change the impedance of the Mains.