On EBay there are now several adapters .I bought a 6x4 to 6 z 4 adapter just plug in and you now can use the much better 6x4 there are now many choices.
I too have used an adapter allows me to use 6X4 rectifier tubes in place of a 6Z4 tube. I just had to modify the tops of my preamps to handle the extra height now of the tubes. I really like the 6X4 tubes in place of 6Z4. Lots of choices to be had.
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