Byrd said:

I didn't think you could adjust the LC575 board by resistor relocation - you needed to replace the oscillator - I suspect this is for an LC580 board?

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No clue, just regurgitating the fact that a page saying you can do it exists. (It's also claimed that the pizza-box 475's use a resistor-adjustable clock generator and, well, they're differently shaped boards but the guts should basically be identical.)