Tested at 91/95
Passed 'Life Test'
on a calibrated B&K 747B tube tester
where the Good range is 65-120
*Paul Hart calibrated/modified Westmore 501 (Triplett 3444)
Not tested for noise or microphonics
Test results may differ between various testers for many reasons such as technical design, aging components, etc. So while test results are a good indication of quality there can be some difference between the many differently designed & maintained testers.