What did your tube data research disclose on voltage and current? How old is the unit (thus, having recourse to the distributor)? I’ve rolled, among others, a metal base Mullard (really a Philips Miniwatt but a GZ 34, not a 32), a fat base 34 and with best success in my system, given its strengths and weaknesses, the GEC u52. (which I have owned as both a black base and a brown base, cupped bottom).
If you fried something and have no warranty, the repair should not be that difficult for someone competent.