Hi!
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I think the component values should be in the same font/size as the component designations.
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I selected the sizes/fonts using principles suggested in BS530/BS3939, "BBC Drawing Office Practice Guidelines" and generally used by most radio and TV manufacturers of the period covered by this forum - if you examine most maker's drawings (BRC/Thorn, GEC, Murphy are three examples) you will find the component refs are slightly larger than the values!
In fact, the references and values are the same height (3.5 mm) but I have used a "condensed" font for the values - this is done for asthetic reasons as for large values with more than three digits, the value doesn't spread out across a line, and helps with the efficient use of drawing-space!
Chris Williams