E188CC 7308 Valvo Made in Holland, dual stage ring getter, VR8 delta Heerlen codes
They are also some of the best sounding 6DJ8 / ECC88 / 6922 / E88CC ever made.
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Perfectlly matched pair within 5% all four triodes, same codes
Click to see all ECC88 6DJ8 E88CC 6922 in stock