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RE: Why do DHTs sound better?

Hi Andy,

I'll think one up now.

With a directly heated tube the cathode is for the most part at the same potential and the voltage gradient between the control grid and the cathode is pretty much the same over the whole surface of the cathode. On the other hand with a directly heated tube there is a voltage gradient across the cathode and therefore a difference in grid cathode voltage depending where on the cathode you are looking. This results in many "micro-tubes" in parallel each with a slightly different bias. The nonlinearities of each "micro-tube" is offset from the others with the result that the aggragate is more linear.

Phil


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