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In Reply to: Re: Harmonic adjustment, PDFs and other weird science posted by BBeck on November 20, 2006 at 18:55:19:
You understood exactly where I was coming from and added the missing detail through the use of some great analogies.Your reply prompted two thoughts. Firstly, it confirms in my mind the benefits gained by loading tubes at the highest practicable impedance. The improved linearity should work to reduce the detrimental effect of varying voltages along the length of the Heater/Cathode as effectively as it does for a fixed voltage.
Secondly, it occurs to me that DC heating just may have the advantage here. Although it does nothing to fix (and actually exacerbates) the problem since the average differential voltage across the cathode is worse than for AC, at least it eliminates the modulation components. In addition, wouldn't the averaging effect I suggested come into play for DC in similar fashion to my analogy of the paralleled tubes set to varying bias voltages (per my ARC example)?
My thoughts on how varying the spacing of the cathode to the other elements along its length might help was based on the premise that it might be possible compensate for the varying amounts of gm at each point (by each mini parallel triode so to speak). However by description this would already constitute differences between each mini triode. It still might help though if it wasn't mechanically difficult.
Regards,
Naz
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Follow Ups
- Always grateful for your input Brian! - Naz 20:57:18 11/20/06 (2)
- Likewise Naz! - BBeck 15:42:11 11/23/06 (1)
- Thanks Brian ... - Naz 16:17:46 11/23/06 (0)
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