Большой англо-русский и русско-английский словарь
heater cathode
Англо-русский словарь технических терминов
indirectly heated cathode, separately heated cathode
Русско-английский политехнический словарь
indirectly heated cathode, separately heated cathode
* * *
separately heated cathode
Dictionnaire technique russo-italien
catodo a riscaldamento indiretto