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Is it possible to build a "self tuned" VTTC?

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LAN_403

hsieh

Sun Oct 30 2011, 01:22PM

Registered Member #1412 Joined: Thu Mar 27 2008, 04:07PM
Location: Taipei Taiwan
Posts: 278

Today most SSTC designs are "self tuned".Is it possible to build a self tune VTTC?Why no one ever build one?

Dr. Dark Current

Sun Oct 30 2011, 01:50PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

Hi,
the VTTC IS a self tuning circuit, it tunes to the resonant frequency of the tank circuit. At this point the oscillator has the highest efficiency. If you wanted it to tune to the resonance of secondary, you would need to use an electronic feedback circuit which would pulse the tube at the secondary resonant frequency, but you would lose efficiency and the plate would get red quickly.

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