Aktuelles immer zuerst!
13.08.2024
Ich hab mich schon immer gefragt, für was die Wicklung NFB (Cathode FeedBack) an meinen Übertragern Tamura (TamRadio) F-475 ist.
Quelle: https://www.tamura-ss.co.jp/jp/products/electronic_components/download/audio_trance/pdf/f400-600-700.pdf
..... This circuit greatly reduces harmonic distortion in quite a different approach than conventional "Global Negative Feedback" and improve sonic performance without disturbing other circuit parameters. By having the output transformer with dedicated cathode feedback coil that connected directly to cathode of output tube, the feedback current path is totally isolate from other component. Unlike notorious global negative feedback which gain the feedback signal from secondary coil of output transformer, cathode feedback coil is virtually free from back EMF induced by loudspeaker or other kind of spurious noise, phase shift from any network circuit; therefore, only pure feedback signal is applied back to cathode of EL-34. This technique reduces THD by the factor of 10 times.......
Quelle: https://www.sacthailand.com/Amp2010MinuteEL34.html
Quelle: http://www.single-ended.com/Lagarto/circuit3.htmDie sekundäre Wicklung sollte sich unterhalb der RC-Kathodenkombi befinden, damit sowohl Lautsprecher als auch die Wicklung auf Massepotential liegen. Macht Sinn, auch wenn ich es schon anders gesehen habe.
Mehr Links
http://livinginthepast-audioweb.co.uk/index.php?p=feedbackwindings
https://www.mennovanderveen.nl/index.php/nl/develop/22-het-project/137-amplifiers-7-8-9-single-ended-with-quiescent-current-compensation-plus-cathode-feedback
https://www.bartola.co.uk/valves/tag/cathode-feedback-se-ampliifier/
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