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Tubes With Numbers
Picture Type Manufacture Socket Desc.
IN-12A Sovtec SK-136 Russian Tube
IN-12B Sovtec SK-136 Russian Tube


Tubes With Symbols and Letters
Picture Type Manufacture Socket Desc.
IN-15A Sovtec SK-136 Russian Symbol Tube


Dekatron Counting Tubes
Picture Type Manufacture Socket Desc.
OG3 (ОГ3) Sovtec K8A Argon filled! For a Purple Color.