Schematic DIY KitRoehrenpruefgeraet For triode, pentode, Magic Eye
Even if the Roehrentechnik its peak has already exceeded a few decades ago, there are still many devices with Vakuumroehren, especially in the audio range. Test of the tubes is given to very special significance, because tubes are components that are subject to strong signs of aging. Or you want to pair two tubes (matched pair), then you need a corresponding test instrument. Here are links to useful circuits accordingly.

Here you will find Schematic Circuit Diagram for DIY and further information on Roehrenpruefgeraet
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Extensive testing device for a variety of tubes
Handy Tester for magic eyes, with battery

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