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FERNSEH · 6th Jun 2015, 3:49 pm

Hi Robin,
It's worth noting that in the Regentone T15 the scan coils are connected via a 100mfd capacitor to the EL38 grid winding of the line OP transformer. The other scan coil connection goes to the width control.
Also in the T15 the scan coils have a centre tap. That 560 Kohm resistor is in my opinion is too high a value to be of any use in that circuit. C30 and R52 (0.002mfd and 5Kohms) could be introduced into your circuit.
So it might be worthwhile checking the line scan coils in the Derwent TV to determine if they have a centre tap connection.

DFWB.

6th Jun 2015, 3:49 pm	#18
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Derwent 9" television Hi Robin, It's worth noting that in the Regentone T15 the scan coils are connected via a 100mfd capacitor to the EL38 grid winding of the line OP transformer. The other scan coil connection goes to the width control. Also in the T15 the scan coils have a centre tap. That 560 Kohm resistor is in my opinion is too high a value to be of any use in that circuit. C30 and R52 (0.002mfd and 5Kohms) could be introduced into your circuit. So it might be worthwhile checking the line scan coils in the Derwent TV to determine if they have a centre tap connection. DFWB.