If you have a Steelhead-


I have been a very happy original owner of a Manley Steelhead for five years. All this time I had the stock tubes. I recently changed the tubes out to vintage 7044's which are just rectifiers in the Steelhead and then Matsushita / National PCC88 / 7DJ8's for the output tubes. I am posting because the upward. change in palpability and engagement is incredible. So if you happen to have a Steelhead... See my system if you care. My favored cartridge right now is a Lyra Etna Lambda on my hot-rodded Garrard 301 with Reed 3P on a Layers of Beauty plinth. 
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The nice thing about tube gear is just by changing tubes one can realize a sonic improvement! This is not possible with SS gear. 
Or living hell. But you can always go back to living heaven.
Any tube change will have different sonic outcome even same brand, same year, same week or day, same type.
Tubes are so.

G