UCH21 Telam is heptode - triode tube with undirectly heated oxide cathode. It was used in many vintage small receivers (for example in Tesla 305U, 306U, 307U, 308U Talisman, T 254, T 120, Rytmus, 401U Accord and others). Tubes are unused, tested on BM215A and packed in Tesla boxes. Manufactured in the 60's by Telam, PL.