We thoroughly test all our preamp valves (tubes) on a digital measuring device pre dispatch. Phase splitter preamp valves (Triodes) can be balanced at no extra cost, please specify when ordering (Checkout/order notes) if you require balanced triodes. Preamp valves included in our valve kits are all specially selected & include phase splitters where required.
All preamp valves are checked for the following:
Transconductance (Gm, mA/Volt)
Noise levels (dbv)
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