Les,
2 points/ questions.
1: You said you have a variac. What input voltage is required from the variac to get the voltages on the schematic ? If it is way off what might be expected from the electrical supply then your transformer probably has a short in the primary, resulting in effect, less windings on the primary and there by increasing the turns ratio, thus increasing the secondary voltages.
2:: If the transformer is rated for 110 volt and works at 30 cycles or less, then I have always been led to believe secondary voltages will go up as frequency goes up.
Regards,
John G.
