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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 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. .
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