These are SUPER SELECT LOW NOISE TUBES selected out of 100 tubes. These are the best sounding, most quiet and magical specimens out of all the Siemens tubes tested.
..."ETHEREAL CONDUIT TO A HIGHER REALM" ..On the other sonic-side lies the realms of musical-ideals, dream worlds, and the sonic-heavens and havens of different tube-religions. Telefunken ECC801S can be the conduit to outer sonic planes or sonic-astral realm".... Tube Museum.