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FERNSEH · 29th Jul 2019, 2:00 am

Hi Peter,
That looks like the frame scanning patent we're looking for although the text doesn't mention anything about the pole extension pole pieces.

The text does mention extra the winding on the transformer used to counter the standing valve anode current. Without this winding the picture will be deflected off the screen.

The Murphy V136 of 1948 employed a self oscillating frame timebase. In this receiver the frame oscillator transformer is also the scanning yoke.

That projection CRT used in the Grosvenor set is an interesting device. Some provision for keystone correction of the raster will be necessary.

DFWB.

29th Jul 2019, 2:00 am	#77
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Baird Garrick Hi Peter, That looks like the frame scanning patent we're looking for although the text doesn't mention anything about the pole extension pole pieces. The text does mention extra the winding on the transformer used to counter the standing valve anode current. Without this winding the picture will be deflected off the screen. The Murphy V136 of 1948 employed a self oscillating frame timebase. In this receiver the frame oscillator transformer is also the scanning yoke. That projection CRT used in the Grosvenor set is an interesting device. Some provision for keystone correction of the raster will be necessary. DFWB.