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Many of these Model 67, 68, & 69 testers didn't include newer tubes (EL34, EL84, 7591, 6CA7, 6BQ5, etc.) in their charts. Even the 7868 is in the charts but The following Tube Tester Manuals, Operating Instructions, and Tube Test Data are available for download. I have collected these over many years and they While other tube testers test your tubes externally, the truest and most relevant test is how your tubes perform in your amplifier. The Tube Tester 2ʼs high- VALVE TESTER. VT-1000. E. NG. LISH. Thank You! Since 1968 when the company was founded, Orange has been a pioneering force in the guitar amplification