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Way back then (60's-70's), the very thin boards were used for commercial production. Hobby boards were thicker - 0.062" probably most common. I recall using 0.12" boards for things (like keyboard substrates) that required mechanical strength.
Now, they are specifying .010” .. I’ve no idea what thickness the original TVT boards were, but I’m guessing they were probably thicker (.06ish?). Thoughts?
Norm
w6nim since 1952