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primary cables and output transformer on speaker

Posted by Barney Vincelette (A) on March 5, 2007 at 12:43:33

With care in routing cables so that the B+ voltage cannot be accidently touched, there should be advantages to running the B+ to the transformer which is moved out to the speaker, then running another cable from the transformer back to the tube plate. (I don't think I would want to do this if I were using something as vaudevillian as an 833A and 3000 volts, but seriously, though) The signal would run at high voltage (240 or so for a typical 45 or 2A3)and low current for greatly diminished a.c. magnetic interaction between cables and the ratio of voltage to complex impedence Zr; (skin effect and grain boundaries in copper) and Zl of the cables would be so great that differences in a. c. current would be neglegible at different audio frequencies. Of course the cables should be separated to cut down capacitive reactance between them. Outside noise would be minuscule compared to signal voltage. Teflon insulator which would have some d.c. bias would be nearly linear or have nearly constant permittivity and the electric field gradient (with respect to r)would be reduced by using large enough diameter cable.
This would circumvent many problems of low voltage high current speaker wire from the transformers to the speakers. Has anyone any opinions on this? Again, safety demands that such cable should not be exposed to someone accidently touching it.

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