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Hello,
as an alternative to the GE luminance circuits, I have cut the luminance circuits out of the schematics for the Kuba Porta-color, see photo. The video signal is given over a R/C to the cathodes of the picture tube with C = 0.47 uF and R = 220K. This might be an improvement also.
I am satisfied with the picture quality of the Kuba Porta-color, and it is an improvement in relation to my GE Portacolors.
Kind regards,
Eckhard
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