Later tetrodes and pentodes such as 817 and ( direct military ) 813 were also used in large numbers in ( especially heated ) radio transmitters Later , tetrodes and pentodes such as 817 and 813 ( direct military ) were also used in large quantities in ( especially heated ) radio transmitters .
Kemudian tetrod dan pentod seperti 817 dan (tentera langsung) 813 juga digunakan dalam jumlah yang besar dalam (terutamanya dipanaskan) pemancar radio Kemudian, tetrod dan pentod seperti 817 dan 813 (tentera langsung) juga digunakan dalam kuantiti yang besar dalam (terutamanya dipanaskan) pemancar radio.