Raytheon 12AU7 Tube Class A Tested@250V Plate GM-IP-MU uTracer3+ -5
*Tested at Vacuum Tube Manual Specs. @250V DC Plate and -8.5V Grid.*
We don't use our TV-7s or our other vacuum tube tester to match vacuum tubes or final testing.
Those are used for weeding out weak and bad vacuum tubes. We prefer using actual
real numerical values. We believe you will get the best results in your application this way.
See photos for tube cosmetic condition and test results. If you seek vacuum tubes that are tested at tube manual specifications, please consider clicking the "Save This Seller" link at the top of the page. See our feedback.
Thank you.
We guarantee and test all our vacuum tubes based on the manufacturers tube Manual specifications using
uTracer3+ curve tracer & Tube tester, regulated DC and AC power sources, benchtop and
handheld multimeters for accurate precise repeatable measurements.
We do use TV-7B, Hickok 800, 6000A, EICO 667, and B&K 700. But these are just tube testers
and not true parametric testing equipment. They are for "Go - No Go" testing and are best for weeding
out bad and weak vacuum tubes.
Truthfully, the best way to know how a vacuum tube will work is to use it in the actual application. The
next best thing is to test it at the manufacturers parameters in the tube manual with proper lab or
bench testing. This way one knows how close the vacuum tube is to it's designed standards. This may seem
excessive, but we try to offer the vacuum tube amp builder, technician, audiophile, and musician the best
service and product we can. More tubes to come.
Shipping
The tube/s will be packaged in original box (if applicable) and then sent out in a 6x4x4 shipping box. We use USPS or FedEX shipping services. Please contact us for special shipping needs.
Ask any questions are concerns you have prior to purchasing so your transaction can be fast and accurate!