 |
| Identical to |
B438
|
| Similar
Tubes |
A4_Zenith (can normally be replaced - small diff'ce)
W420 (can normally be replaced - small diff'ce)
|
| First Series |
1927 Tube leaflet collection E.Erb Analysis by original leaflets |
|
| Base |
Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
|
| Filament |
-: Direct /
If: 0.1 Ampere /
Vf 4 Volts /
|
| Literature |
Taschenbuch zum Röhren-Codex 1948/49
|
|
|
|
|
|
John Koster
John Koster
|
|
Telefunken Werkstattbuch
Wolfgang Bauer
|
|
RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector
|
|
|
