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FERNSEH · 5th Jun 2015, 11:37 am

I checked the temperature of the line hold control in the "upside down" Philco.
This set has the Plessey chassis. The control runs cool irrespective of the position of the slider. The fact the line hold control runs hot suggests a very high current is passing through the variable resistor and it would also suggest that current also flows through grid of the valve.
Very strange.
It might be worthwhile checking the 0.25mfd capacitor which is across the line hold control. A slight leak wouldn't matter much through.

DFWB.

5th Jun 2015, 11:37 am	#15
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Derwent 9" television I checked the temperature of the line hold control in the "upside down" Philco. This set has the Plessey chassis. The control runs cool irrespective of the position of the slider. The fact the line hold control runs hot suggests a very high current is passing through the variable resistor and it would also suggest that current also flows through grid of the valve. Very strange. It might be worthwhile checking the 0.25mfd capacitor which is across the line hold control. A slight leak wouldn't matter much through. DFWB.