Hi Brett I have been following your posts on the 4D32 project with some interest as I too had the same idea. Kind of a coincidense.
A few years ago I purchased a couple of mod xfmrs from Fair when the prices were right. The mod xfmrs were rated at 150 watts with a 2400 z , 350ma secondary. I noticed lately some of these have been showing up on ebay for a good price. Anyway, I thought a good final for a 275 to 300 watt rig using that mod xfmr might be a couple of 4D32s at 810 to 840 v. I kicked the idea around with some of the local midwest am'ers and came to the conclusion that so long as the disapation wasn't exceeded that it would be OK. I have collected a bunch of 4D32 spares as I have three rigs (Vik I, HT-20, 32V1) which uses them. Will follow lyour progress with interest . Sounds like fun. Good luck. 73, Wayne, N0TE