Quote:
Originally Posted by trinescope
... When Motorola started making sets with the first modern rectangular tube, the 23EGP22, they had to include extra circuitry for pincushion correction. I'm sure there were changes to the convergence circuits as well since this CRT had a flatter faceplate than the 21" round tubes...
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Correct. Rectangular sets required at least third harmonic horizontal-rate dynamic waveforms in addition to the sawtooth and parabola of the roundies. This adjusted the convergence midway between screen center and the left and right edges.