David Axt

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Commercial vs. industrial tubes

How do "industrial" vacuum tubes compare to "commercial" tubes? Are they more rugged? Less noise? Are they less quality because they are intended to be used in industrial applications not audio applications?

For example there are a lot of industrial equivalents (5751, 6057, 6681, 7025, 7494, 7729) to the 12AX7 tube. How are they different?

Thanks,

David

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