BTW, the AT 3060 looks like an interesting hybrid design since it uses a full, but otherwise, low plate (22vdc) voltage on each section, including an output transformer. Despite not having the electron activity as your much higher voltage dual triodes like the ECC81, ECC82 and ECC83, this mic looks like it might have a unique sonic signature. This is what makes recording so interesting.
Hope you get it up-and-running so you can tell us how it sounds. Best.
My 3060 is my favorite LDC, over my KSM44 and Baby Bottle. It seems to generate really nice 2nd order harmonics down in the midrange, without too many highs. It is best using sparingly otherwise your tunes sound a bit too much like an apple pie fresh out of the oven