6H30 replacement

I have looked for a western replacement for the 6H30, but I believe the 6DJ8, 6922 or 7308 would get destroyed because if the high voltage.

this is for a hybrid amp, Pathos Heritage. When I bought the amp, I was told that the voltage was low enough for 6DJ8, 6922 or 7308 but now I am being told otherwise.

I just have no ears for the 6H30s and I want to get them out of my amp if at all possible.

thank you for your help.

Astolfo