 |
| Identical to |
21TH8
= TX21
|
| Similar
Tubes |
CCH1 (other base)
6TH8 (Heater different)
|
| First Source
(s) |
Apr.1937 : Histoire de la lampe de radio
|
| Successor Tubes |
1939
ECH3
|
|
| Base |
Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Ua)
|
| Was used by |
Radio/TV-reception etc. |
| Filament |
-: Indirect /
-: Series, AC/DC /
If: 0.2 Ampere /
Vf 21 Volts /
|
| Literature |
Histoire de la lampe de radio
Taschenbuch zum Röhren-Codex 1948/49
|
|
|
| |
|
| |
Internet
Miguel Angel Trujillo-Rodriguez
|
|
|
|
W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe
|
|
|
