My path so far has been to change the rectifier tube to a GZ34 metal base Philips Miniwatt Holland metal base with welded plates
A pair of RCA 6F8 6F8G Substitute Vacuum Tubes With Adapters in the balanced positions (I use XLR to the amplifiers)
And switching between the Sylvania S6SN7-SYL2 black base and the Psvane CV181-T-MII/2 in the output positions. I find the Sylvania's slightly more favorable to the highs with the Psvane very complimentary.
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