 |
| Identical to |
2506
|
| Similar
Tubes |
506K (Heater different)
VG401 (Heater different)
|
| First Series |
1928 -- Collector info (Sammler) John Hupse |
| Production stop |
1929 |
| Successor Tubes |
1927
506K
506
|
|
| Base |
Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
|
| Was used by |
Radio/TV-reception etc. |
| Filament |
-: Half indirect /
-: Parallel, (AC/DC) /
If: 1 Ampere /
Vf 4 Volts /
|
| Description |
The Philips 2506 is the earliest-known rectifier to use a semi-indirectly-heated cathode. To be able to work with 4 pins only, the cathode conection is joined with one end of the heater. The "RVF-Röhrenbuch-M1, 1947" is not very accurate in this respect - it does not reflect the semi-indirect heater.
This tube was first used in the Philips 2514 receiver, produced in 1928.
The semi-indirect heated Philips 2506 can be easily replaced by a direct heated 506K tube. In fact this is exactly what happened after the production of the 2506 was ceased by Philips in 1929. The production of the Philips 2506 was stopped in 1929 because of reliability problems with the heater.
(Info by John Hupse)
Text in other
languages (may
differ)
|
| Literature |
Taschenbuch zum Röhren-Codex 1948/49
|
|
|
|
|
|
Philips 2506, 1928
John Hupse
|
|
rtt
Michael Schlör
|
|
RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector
|
|
|
