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  Technical Publication of Vacuum Tube Rebuilding service.

Despite the inroads of transistors, there are still applications where vacuum tubes work best. Due to the specialized nature of vacuum tubes and the limited exposure of engineers and operators to them in todays transistorized and integrated
circuit world, Econco has prepared this booklet. The
information contained is a result of our twenty-five years of rebuilding tubes and talking with you, the users. We hope it helps you in working with these products. If this booklet
proves helpful to tube users, it is our intention to periodically update the information. Your comments and suggestions would be appreciated.
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