 |
| Identical to |
A409
= PM3X
|
| Similar
Tubes |
4AF (can normally be replaced - small diff'ce)
A4 (can normally be replaced - small diff'ce)
407A_Eagle (can normally be replaced - small diff'ce)
R75 (can normally be replaced - small diff'ce)
A409_Tfk-4pin (other base)
A409_UX-4pin (other base)
H412 (can normally be replaced - small diff'ce)
|
| First Series |
1926 Tube leaflet collection E.Erb Analysis by original leaflets |
| First Source
(s) |
1924 : Saga of the Vacuumtube, Tyne p.421
|
|
| Base |
Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
|
| Was used by |
Radio/TV-reception etc. |
| Filament |
-: Direct /
If: 0.06 Ampere /
Vf 4 Volts /
|
| Tube prices |
3 Tube prices (visible for members
only)
|
| Literature |
Taschenbuch zum Röhren-Codex 1948/49
|
|
|
|
|
|
collection JR
Jacob Roschy
|
|
Telefunken Werkstattbuch
Wolfgang Bauer
|
|
RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector
|
|
|
