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A few easy things to try.
1) remove the modules & clean the contact. Check for cold joints also.
2) Look on the tuning ASSY for the standby transformer & on/off relay.
They got cold joints.
3) Post the layout chart & pics of chassis and tuner assy's
Soft tube is a low emission / weak CRT that still give a pix, but a poor one.
its usually a slow prosses that over time gets worse & worse.........
Zeno
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