NOTE: After spending $$$$ on tooling and various prototypes, we have fitted Special Grade Flying Leads tubes with Custom Bakelite Bases developed in-house. It is a multi-step, labor intensive process. Each lead is straightened and cleaned to ensure perfect fusion with the base pins in the soldering bath. Process is painstakingly slow, so we will be adding a few tubes at a time to the inventory.
Tubes are Plug & Play, Ready to Use, fitted with our Custom made Bakelite Bases (INTL Patent Application in Process).
Rare 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 KB/Z from MO (Marconi Osram) Valve Company, Hammersmith Plant.
CV4001 premium grade version of the 1960s Black Plate CV4005/6X4WA/6063 is one of the best from Genalex in the 6X4 types.
Tested and matched on Hickok 752, just recently calibrated and modified by Hickok expert to all Solid State to eliminate drift.
These tubes are one of a kind. No refunds, exchanges or tube rolling at our expense as it says in the Terms and Conditions on the web site.
Single Tube = $50.
Definitely Premium Overall!! 
