Thread: Gec bt1091.
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Old 16th Mar 2018, 2:11 am   #17
FERNSEH's Avatar
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 5,414
Default Re: Gec bt1091.

Just about all the Maplins sourced components have been replaced.
Tested the receiver today. A few faults have appeared. A coil on one of the vision IF transformers was found to be open circuit. The lead out wire to a coil former tag had become detached, possibly when I was replacing the decoupling capacitors.
The local oscillator had packed in. Another faulty GEC valveholder. Rock the L63 valve in it's holder and the oscillator will come back to life. When the picture appears it is apparent that the CRT is getting brighter with use. There is some smearing on the picture which will be most likely be a fault in the video amplifier stage.

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