Using industrial transformers in reverse for HT

[Newbietube]

Hi I found a range of transformers in Radio Spares intended for use in control panels. They were designed with multiple voltage primary windings and 230v and 115v secondaries. If used in reverse this would give a big range of HT voltages. Is it safe to do this and has anyone here done it? I ask this because they are a lot cheaper than "valve" transformers.
Cheers Just

[battradio]

Well with 230 / 240 mains , i would take two of them ( alike ) and series the 115 volt windings and get 460 volts ceter tapped out . That would give you about 325 volts DC out with full wave rectification with ss diodes or 300 volts DC with a valve rectifier .A full wave bridge with ss diodes would be about 650 volts DC , if you need less than 650 use a choke input filter .

You would most likely trip a mains breaker , with 230 into a 115 primary

[Tubeamp]

Hi,
Make sure they are isolating transformers !

[Blair]

I use one like that often. It was designed as a "step down" from 440 or 220 to 120. Labeled as an isolation transformer.

I use it backwards like that with no issues and I know it can handle the voltage.

Blair