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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. Brand new, MINT NOS Late 1960s RFT ECC83 12AX7 VEB Röhrenwerke Anna Seghers Neuhaus Prod Tubes with Halo Getter. Made in E. Germany. These are in the top 2-3 desirable tubes for Guitar tone, and also work fine in Audio gear. .
502 2011M 552
NOTE: Tubes are similar to the ones in picture. Labels are very fragile.

Brand New MINT NOS Rare SEPT 1970 Tungsram HONVEDSEG ECC83 Military Production tubes. See Military Acceptance stamp HONVEDSEG on the back (tube on the right shows back view). Brand New MINT NOS NIB October-November 1970 Production Tungsram ECC83 tubes. Made in Hungary. These late 1960s tubes are hard to find these days.
713 969