Sonically, what's the difference between the metal-base and non metal-base 5AR4/GZ34 rectifier tubes, Philips/Amperex or Mullard? Especially as they perform in the Modwright 9.0 SE preamp?
I just can tell that when I had Carry SLP-05 and replaced original rectifier with Philips Miniwatt GZ34/5AR4 metal base nos 1957 I could not believe the difference it made. Yes, it was expensive move, but with great result.
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