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Old 03-11-2017, 04:37 PM
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old_tv_nut old_tv_nut is offline
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Join Date: Jul 2004
Location: Rancho Sahuarita
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I have no idea about the gradual loss of picture (I have never played with one of these) except that you mentioned back bias lighting. Have you tried it? An LED flashlight, with its high blue content, might be good for a quick test.

Can you post a schematic of the first amplifier stage?
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