All tubes come with a full 30 day, unconditional, no questions asked, money back satisfaction guarantee!

Test scores normally average 85% to 95% of NOS values.

These particular tubes measure from 100% to 110%

Individual test scores will be written on the new boxes that you receive with your tubes.

You are purchasing a "Platinum Plus Grade" tube. This means that the plates are very tightly matched on a calibrated Hickok 799 within 1%  

Please see our other listings for "Silver, Gold and Platinum" tubes. Silver Grade tubes are matched within 15%, Gold Grade tubes are matched within 10% and Platinum 5%.

The Gold and Platinum tubes are recommended for more critical applications such as your preamp and phono stage.

Please email with any questions and/or concerns.

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