[sandbar40]

If you restored it back to 2.5V why do you need the transformer anymore?

Good question, i want to use it to power a 1.5 v iJ5 tube which is the opt tube in a Zenith 6 J 230, a 6volt or 115 v ac set. all other tubes are 6 volt but the 1J5 has it's filament supplied via two special dial lights (blown) and resistors.
To avoid this i want to use the trans with a rewind and tappings to get 1.5 v.