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In Reply to: RE: Suggestion..... posted by tube wrangler on December 1, 2008 at 04:22:36:
> > Another interesting fact is that while higher current operation may very well show slightly better linearity at full power, the small-signal linearity-- and more importantly-- the transfer efficiency-- at more conservative op. points is vastly superior. < <
> > you'll find that tubes operating at less stressful operating temps have wider musical bandwidth, much lower distortion, and vastly better dynamics < <
Not in my experience, measured, perceived or otherwise. Having said that, I'm not advocating pushing a tube to its limits, just that as a rule most Triodes perform better (audible and measured) at higher current. Distortion reduces and its obvious.
To further explain, I'm talking about tubes in OP stages, where they are forced to run at lower than optimal load from a distortion perspective.
There are always exceptions to the rule but even these can be quantified. The driver is one place that can benefit from lower current and higher distortion due to distortion cancellation (to some extent) with the OP stage. While the technique can be used in other groups of tube stages, the OP stage produces by far the most distortion in a well designed amp and therefore cancellation can be used to the greatest effect in the driver stage.
In particular, I don't understand how the effect on small-signal linearity can differ from the large-signal linearity at more conservative operating points. I also don't understand how greater transfer efficiency iss achieved under these conditions.
Again, I coming from the POV of fact. I'm not advocating running tubes at max.
Rgds,
Naz
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Follow Ups
- Please explain ... - Naz 12/4/0822:13:07 12/4/08 (0)
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