I just got some 417a's for my Lamm LP2, I know they should improve on the Amperex 5842 in there now, but I was curious about changing the rectifier tube. I know it converts ac to dc and can limit current in amps, but a phono pre I think would have very low current draw. Anyone hear changes in a phono pre when changing rectifiers. Currently it has a amperex 6X4, I bought a GE6X4 nos from the 50's as a back up, but was curious about any sonic impacts it may have. Anyone know these tubes and have any thoughts or advice?