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Another factor to the poor picture may be due to all the RFI back then. Think about how many ham operators and unshielded electric motors were in operation then.
As for the drift of settings, in the 70's I recall many ads and commercials for sets that "locked on" the signal to maintain proper color etc as you changed the channel.
Why did you guys have to bring up Variable Venturis? I still wake up in a cold sweat screaming because of those things LOL They weren't repairable in the real world as no one was willing to pay for the labor to set them up correctly. Dial indicator required for sitting a carb? Yegads. Never was a fan of old Hank's products but I did become an idiot savant with GM's feedback carbs and still have all the factory tools. Those were nearly as labor intensive but the odds of a successful and lasting repair were much much better than the VV's. I could also get rid of the morning stumble of most 70's American iron and even eliminated the left hand stall out on Thermoquads. Impressive yes? LOL
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