UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Focus Diode · 18th Sep 2018, 10:15 am

It was late last night. I think the cause could be the boost feed resistor to the height control as there's not much overscan. As John says these sets usually have plenty to spare.

The 960's height control can be set so only the centre circle of Test Card C is elongated to reach the top and bottom of the screen! See photo.

With the Ferguson, attempting to get the linearity right at a lower height setting can't be achieved either with the bottom cramping evident with slight fold over on Lin adjustments. A few more resistors to check.

The card placed over the contrast/hold controls has to be removed to get to the boost feed resistor.

18th Sep 2018, 10:15 am	#49
Focus Diode Octode Join Date: Jan 2006 Location: Borough of Gateshead, UK. Posts: 1,420	Re: Stuck on a BRC 1400! It was late last night. I think the cause could be the boost feed resistor to the height control as there's not much overscan. As John says these sets usually have plenty to spare. The 960's height control can be set so only the centre circle of Test Card C is elongated to reach the top and bottom of the screen! See photo. With the Ferguson, attempting to get the linearity right at a lower height setting can't be achieved either with the bottom cramping evident with slight fold over on Lin adjustments. A few more resistors to check. The card placed over the contrast/hold controls has to be removed to get to the boost feed resistor. Attached Thumbnails