Tone difference between KT88s and KTs and EL34?

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During the last amp ordeal that brought me here.... I found some information regarding new tubes

New Sensor makes: Sovtek, EHX, Tung Sol, Mullard, Gold Lion, Svetlana S marked == basically all Russian made tubes except the Winged Cs.

Svetlana SED makes: =c=

JJ Electronics: JJs and the relabeled tube with the CZ suffix (Ruby, GT)

Shuguang: all Chinese tubes used in amps

Basically four manufacturers. Blackburn is supposed to be getting the old UK Mullard plant producing again making ECC83s. Their website is up but I haven't seen anything since.

The advantage of Ruby Tubes is screening and a six month warranty. Eurotubes I usually get the next day.
 
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