 |
| Identical to |
DER
= CV1642
= VT33
|
| Similar
Tubes |
LT1 (other shape (e.g. bulb, size))
|
| First Source
(s) |
1922 : British Radio Valves - The Vintage Years, Thrower p.51,52
1925 : Saga of the Vacuumtube, Tyne p.382
|
| Predecessor Tubes |
LT1
|
|
| Base |
Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
|
| Filament |
-: Direct /
-: Battery = /
If: 0.35 Ampere /
Vf 1.8 Volts /
|
| Description |
Codex erroneously notes for the filament 2V, 0.1A; but the predecessor LT1 has the same filament data 1.8V, 0.35A.
Production of these tubes was maintained well into the 1930s with a modern shape glass and base but maintaining the horizontal cylindrical form. This was one of the last types with this early structure.
|
| Literature |
- - Manufacturers Literature
Taschenbuch zum Röhren-Codex 1948/49
|
|
|
|
|
|
own collection
John Koster
|
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