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FERNSEH · 16th Sep 2015, 8:49 pm

The set has a future. Restoration will start soon.
It's likely this set is the only example in existence. A major recapping job required of course and the complex flywheel system will receive special attention.
The line timebase employs a sinewave oscillator and the frequency and phase is controlled by a reactance valve which in turn controlled by a double-diode phase discriminator. The circuit works beautifully but only when high quality silver mica capacitors are used in the oscillator and reactance stages.
A similar circuit was employed in certain earlier Ferguson models and the later models 305T and 405T.

DFWB.

16th Sep 2015, 8:49 pm	#7
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Ferguson 247T: huge console TV set. The set has a future. Restoration will start soon. It's likely this set is the only example in existence. A major recapping job required of course and the complex flywheel system will receive special attention. The line timebase employs a sinewave oscillator and the frequency and phase is controlled by a reactance valve which in turn controlled by a double-diode phase discriminator. The circuit works beautifully but only when high quality silver mica capacitors are used in the oscillator and reactance stages. A similar circuit was employed in certain earlier Ferguson models and the later models 305T and 405T. DFWB.