Quote:
Originally Posted by stevehertz
It's all very well this talk about how valves change from the day are they made through the period in which they are used/listened to. I, and thousands of others get that, we know that! The point is, can it be HEARD?!
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This would probably depend on the circuit. I think the most important change in tube parameters is in the emission, so I think the mutual conductance would be affected as well. In a good design this is compensated with a feedback loop, but especially audiophile designs might depend a bit more on the open loop performance.
Also possibly the bias could be affected. Again, depending on the circuit. A low idle current may result in more distorsion.
P.S. I don't think we're participating in an audiophoolery thread since the thread title is more general; even if the difference can't be heard in a good audio design, it can be seen in television sets and measuring equipment. And probably heard in bad designs.