[sharpo]

A transformer will increase the output by the same percentage as it's input has been increased, so a 10 volt increase on the primary to 230 will equate to a lerger voltage increase from the secondary, if the secondary is putting out 12-1400 volts allready it would increase by about 50 volts "allegedly".

Buy some better valves just in case.

Watford valves are a good source.