[morzh]

Eddie

There are two major reasons for higher voltages (here I am not considering those that are results of circuits' malfunctions but only benign ones)

- Higher voltage in Mains nowadays, and
- Measurements are done with todays high impedance multimiters.

The latter you do not need to worry about, the former I do not address unless I intend to listen to a radio for prolonged periodes of time.
Resistor in the primary, although electrically it is ok, is not the preferred way, as it will dissipate power.
The preferred way with transformer radios is the bucking transformer.
You could find the circuit on the web, it is rather simple and includes a small (10-20W) 120/12V transformer and then you could either install it in the radio, or (I would rather do it this way) take an electric outlet metal box from Home Depot and assemble a "bucking outlet". Then you could plug your radio the way it is should be, in a 105-115V outlet.

It takes a tad more labor and costs a bit more, but won't dissipate anything other than normal transformer losses.