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After getting the tubes, we have discovered that these are NOT Original NOS Tesla ECC803S (click More Photos to compare). We have no idea of when and where these were produced in Slovakia. Brand New MINT NOS NIB Rare 1973 BRIMAR CV4035 Box Plate Military tubes. CV4035 Flying Lead is Premium Grade, High Reliability Long Life version of ECC83/CV492/CV4004/6057/12AX7 valves. STC Rochester Plant Date Codes. Made in England. MINT NOS NIB Mid-1960s Siemens & Halske 3-MICA E83CC Halo Getter tubes RCA Label and box. Etched Siemens & Halske Munich Plant date codes on the glass. Made in Germany. These tubes are obscure and one of the top ECC83 12AX7 types.
502 2011M 1152