Upscale Calculator

This handy calculator helps you pick a tube for your next upscale (or downscale) project. Choose the original kit tube, and optionally enter a length to be scaled along with the tube. You can also enter a desired scale amount to find tubes that match.

New Tube Diameter Scale Length

Body tube data taken from this spreadsheet by "OL JR" and this one by Phill Ash.
The tubes listed as Loc/Precision are standard high-power sizes also offered by other manufacturers in phenolic and fiberglass.