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regentone001 · 28th Jul 2019, 11:38 am

Hi dazzlevision I have found the reason for no picture on this chassis. The 2nd vision I.F coil has been wrecked, the one with the GD12 diode in. It Looks as though the core had been screwed in until in jammed and then it broke the former off at the base and broke the wires to the coils. It was had to see when the coil was on the chassis but now I have taken it off it is easy to see. I found out because I was only getting 33 volts on the anode of the EF183 instead of an expected 215 volts as stated in the makers manual.
I have put in a request in the forlorn hope that some one has a scrap chassis with a good coil
Steve

28th Jul 2019, 11:38 am	#5
regentone001 Heptode Join Date: Sep 2014 Location: Coventry, West Midlands, UK. Posts: 519	Re: KB WV20 Warwick Hi dazzlevision I have found the reason for no picture on this chassis. The 2nd vision I.F coil has been wrecked, the one with the GD12 diode in. It Looks as though the core had been screwed in until in jammed and then it broke the former off at the base and broke the wires to the coils. It was had to see when the coil was on the chassis but now I have taken it off it is easy to see. I found out because I was only getting 33 volts on the anode of the EF183 instead of an expected 215 volts as stated in the makers manual. I have put in a request in the forlorn hope that some one has a scrap chassis with a good coil Steve