Re: "Audio" Valves
The hype about double triodes has come from the guitar amplifier fraternity where they are driven to distortion to add colour to the sound. It is quite reasonable that differently constructed valves of the same type might have different behaviour at these limit conditions.
Plug & play with valves for hi-fi use may show differences in performance but it is more likely to be related to the circuit they are plugged into than the valve itself. For example ECC82 and ECC83 are not interchangeable and using a different type will alter bias positions and present different gains and impedance that could easily result in an apparent change in tonal quality. Also the valve is 60 years old with unknown history so there is no assurance that the sample you plugged in is in good health.
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