G.E.C (Genalex) 6X4WA CV4001 Rare 1958 Black Plate Square Getter MINT NOS NIB Premium CV4005 Rectifier Marconi Osram Hammersmith Prod. England - Plug and Play Ready to Use NOT recommended for Modern tube

NOT recommended for Modern tube gear (most do not have enough clearance for the center screw)

Another hand written serial number on the side and text PM25525-1

Some tubes have completely unusable boxes due to age

Top part is Brand New 1960s British Made McMurdo Phenolic socket

The BEL ECC88 should be a top consideration for any 6922/6DJ8/E88CC/ECC88 tube amp

G.E.C (Genalex) 6X4WA CV4001 Rare 1958 Black Plate Square Getter MINT NOS NIB Premium CV4005 Rectifier Marconi Osram Hammersmith Prod. England - Plug and Play Ready to Use NOT recommended for Modern tubeRare Brand New, MINT NOS NIB 1958 G. E. C (Genalex) 6X4WA CV4001 Black Plate Square Getter Tubes. In white military boxes with brown cigar rolls. Made in England. All tubes have same date batch code PG, PE or QC KB Z from MO (Marconi Osram) Valve Company, Hammersmith Plant. CV4001 premium grade version of the Black Plate CV4005 6X4WA 6063 is one of the best from Genalex in the 6X4 types. These tubes are one of a kind. No refunds, exchanges or tube