[Arran]

Terry isn't trying to dissuade you from converting it to AC set because of monetary reasons, most 1930s farm battery sets are not worth all that much, it's more for logistical and technical reasons. I have seen several battery sets over the years where someone tried converting them to AC type tubes and they either did not work, usually because someone got half way through it and gave up, or if they did work they worked poorly. It's much easier to build an off board battery eliminator power supply, and to get the battery set running from AC by that method, then it is to convert a battery set to an AC set. You can viewing glowing tube filaments inside 2 volt battery tubes, they are much easier to see then in something like a 1.5 volt type like a 1R5. If you want to have a bare chassis with glowing tubes on display why not just find an AC chassis without a cabinet, there are lots of those around.
Regards
Arran