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The video and chroma circuits are so simple on PortaColors, they are very sensitive to weak tubes. I replaced the 11BT11 video output and 6AC10 color amp tubes on mine and it made a major improvement. Adding DC restoration helped too.
If yours is the H-3 chassis, there is an original SAMS manual for sale on EBAY.
Last edited by tomdot99; 02-04-2026 at 01:42 PM.
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