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None ! For this particular tube, Good Old Stock Wins !
Posted by Interstage Tranny on June 6, 2012 at 08:00:23:
Likewise, with the 5V4/GZ32, old tubes, even good used ones, are the clear winner for longevity. Consider buying any of the new rectifiers and risk blowout within two years; Add the cost of two new tubes plus postage over three to four years, if you are lucky, and you quickly realize that good old stuff is the best bet.
Now, tally your current requirements. You might be able to get by with a 5V4GA instead of a 5AR4; much cheaper. Stay within current limitations, of course.
When I hear of all the failures with new rectifiers, my head spins. Depending on the month/year of manufacture...; are they kidding ? Quality control is amiss these days; certainly. Stick with known quality. Buy good used tubes from reputable sources...