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I'm the guy that did the VA62 mod EPROM. The VA62 does not need the mod to do the 45MHz IF color sets. The mod expands the range of the 35-50 MHz signal generator function to about 10-99 MHz. The VA62 does not have a sweep generator. I use it as a digital marker generator while using a Wavetek 1002 sweep generator and Tektronics scope for IF and RF alignments. I learned aligning from watching bandersen video, THANKS Bob! The mod also modifies channel 42 to the 25 MHz IF frequency for use in doing early TV alignments. This lets you drive the IF stages with the VA62 video test patterns and audio tone which can help when IF aligning and finding tuner problems. I found the VA62 Multiburst frequency sweep useful during alignment of my 21CT55 (very touchy, difficult to align) because you can see the signal amplitude on your scope (and on the CRT face) of frequencies from 0-4.5 MHz in .5 MHz steps. I also used a Heathkit IG-57A marker/sweep generator to see multiple markers on the Wavetek sweep on my Oscope. I can still supply/burn EPROMs for those interested.
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