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To elaborate a bit more on the purity set up, when you slide the yoke forward looking for the best all-screen red purity, the "sweet spot" will typically be where the yoke is 1/4" to 3/8" shy of being fully seated against the CRT bell. Clamp the yoke there. (On rectangular CRTs, the sweet spot is usually 1/8" to 1/4" shy.) And yes, this was taught by field reps at "RCA school" at the distributor in Phoenix.
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