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Audio and Video Talk
Valves / Vacuum Tubes
Beginner valve amplifier
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<blockquote data-quote="Ampdog" data-source="post: 506333" data-attributes="member: 144"><p>Timber,</p><p></p><p>Sorry to have been scarce lately - you know why.</p><p></p><p>I am unable to work out from Yves' algorithm how he proportions primary and secondary sections - perhaps Karel or Winder can inform. As said before, also by Karel, basics indicate that lowest leakage is achieved by equal sections, with half sections on the outside. (See RDH-4, p.218, fig. 13E for relative indices as originally calculated by Crowhurst). I know some designers used half secondary sections on the outside, possibly to obtain 4/8 ohm secondary possibility (no taps!), but it can be inconvenient to halve secondaries and still cover full layers. Designers more often used half primaries on the outside for convenience and also slightly lower equivalent intersection capacitance. [But this can be very much of a muchness as the saying goes; the closeness of layers to each other also has a great effect on both Ls and Ce (calculations assume no space between layers, in practice only possible on corners unless one compresses, which again .... never mind for now).]</p><p></p><p>But not to hi-jack thread to a transformer tutorial.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 506333, member: 144"] Timber, Sorry to have been scarce lately - you know why. I am unable to work out from Yves' algorithm how he proportions primary and secondary sections - perhaps Karel or Winder can inform. As said before, also by Karel, basics indicate that lowest leakage is achieved by equal sections, with half sections on the outside. (See RDH-4, p.218, fig. 13E for relative indices as originally calculated by Crowhurst). I know some designers used half secondary sections on the outside, possibly to obtain 4/8 ohm secondary possibility (no taps!), but it can be inconvenient to halve secondaries and still cover full layers. Designers more often used half primaries on the outside for convenience and also slightly lower equivalent intersection capacitance. [But this can be very much of a muchness as the saying goes; the closeness of layers to each other also has a great effect on both Ls and Ce (calculations assume no space between layers, in practice only possible on corners unless one compresses, which again .... never mind for now).] But not to hi-jack thread to a transformer tutorial. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Beginner valve amplifier
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