How, exactly, does a 5AR4 protect against cathode stripping?
I'm in the midst of designing pp 2A3 monoblocks with stand alone power supplys. I'm thinking more and more about tube life with these triodes being a bit expensive. Are there other rectifier tubes that will provide the same protection? I was thinking 5Z3 rectifiers but not sure about potential stripping problems with these. Can anyone help me out here?