 |
| Identical to |
DF21
|
| Similar
Tubes |
DF31 (different connections)
DF21_9pin (other base)
|
| First Series |
1940 Tube leaflet collection E.Erb Philips Archive |
| First Source
(s) |
Mar.1940 : Philips Bulletin # D 78
1939 : Philips Buch
|
| Predecessor Tubes |
KF3
DF21_9pin
|
| Successor Tubes |
1941
DF25
|
|
| Base |
Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Vu)
|
| Was used by |
Radio/TV-reception etc. |
| Filament |
-: Direct /
-: Battery = /
If: 0.025 Ampere /
Vf 1.4 Volts /
|
| Tube prices |
0 Tube prices (visible for members
only)
|
| Literature |
Taschenbuch zum Röhren-Codex 1948/49
|
|
|
| |
|
| |
Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus
|
|
|
|
Herbert Odermatt (eig. Sammlung)
Herbert Odermatt + 26.Nov.05
|
|
Telefunken Werkstattbuch
Wolfgang Bauer
|
|
RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector
|
|
|
