Re: Gec bt1091.
A electrically similar add-on white spot inverter was available for the first generation EMI televisions, models 900, 901 etc. Like the GEC BT151 unit a triode valve was employed, an MH4 which was the general purpose triode of those times.
With this type of circuit it is essential the video DC component from the video amplifier is maintained.
DFWB.
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