Tag Archives: tube matching

Why Grade A tubes only have one test card in the box?

We provide Grant Fidelity Grade A matched pair or quad of tubes – these tubes are usually packed in one box with one test card showing the ‘plate current’ reading in ‘mA’

Some customers inquire why we are not providing 2 or 4 cards showing same readings on all tubes – the reason is: we match tubes in pairs or quads to our specification. No two tubes will have 100% identical reading so we provide the average readings of all matched tubes in the package. It is misleading and untruthful to provide you 2 or 4 cards showing all same readings on all tubes because they simply DO NOT have 100% the same readings.

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