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Well, i think there is no need to do that. Tube rolling is a high end hobby, and I do not believe that the little output transformers and the sounded prestages in our old radios would affect the sound they make... changing the cap coupling the prestage to the endstage could do more... there are only working and non-working ELs... thatīs my opinion.
If you had a pp-amp things could be another way. But your Carmen (?) is single ended. (Ah, I see itīs a Turandot, your dial is total different to the german ones.)
There are Telefunken, Valvo, Sovtek, RFT and no-names in my amps. It didnīt change anything.
By the way, did you check your electrostatic speakers? They are known to get week.
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