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

FERNSEH · 12th Jun 2017, 3:07 pm

Well there's just the video amplifier to sort out. The high gain RF and IF amplifiers have been tamed so now there is a sensible 3volts of +ve video on the grid connector of the Z66 video amplifier. The negative going video signal at the anode of the valve is AC coupled to the CRT cathode through a 2mfd electrolytic condenser, that part needs replacing. More serious is the fact the CRT connector has fallen into pieces so something will have made up there.

Let's see if some sort of picture can be displayed on the screen tonight.

DFWB.

12th Jun 2017, 3:07 pm	#88
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: HMV 1804 Television. Well there's just the video amplifier to sort out. The high gain RF and IF amplifiers have been tamed so now there is a sensible 3volts of +ve video on the grid connector of the Z66 video amplifier. The negative going video signal at the anode of the valve is AC coupled to the CRT cathode through a 2mfd electrolytic condenser, that part needs replacing. More serious is the fact the CRT connector has fallen into pieces so something will have made up there. Let's see if some sort of picture can be displayed on the screen tonight. DFWB. Last edited by FERNSEH; 12th Jun 2017 at 3:23 pm.