Antique radios, Old Time Radios
DET7
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Country:
Great Britain (UK)
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| Identical to |
DET7
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| Similar
Tubes |
Other class quality (otherwise equal):
PT25
Other base and data slightly different:
DET8
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| Base |
Europe 5-Pin , B5 (Eu O, F, O5A) 1928
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| Was used by |
Transmittertube (Radio) |
| Filament |
Vf 4 Volts / If 2 Ampere / Direct / Specified voltage AC/DC |
| Description |
This tube was the 25 watt version of the PT25.
Description in "The Saga of Marconi Osram Valve":
"DET7 and DET8, unlike the previous DET valves in the sequence, the DET7/8 were pentodes. They were the direct equivalent PT25 receiving valve with oxide coared filament but used carbonised nickel anodes to aid the dissipation of 25 watts. The carbonisation process used acetylene and produced dull grey rather than black colour. These were small valves, pear shaped with bakelite bases and were identical except for the fact that the DET7 used a 5-pin base with internally connected suppressor grid whereas the DET8 had a 7-pin base allowing access to the suppressor grid for modulation purposes."
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| Information source |
The Saga of Marconi Osram Valve p169
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DET7: Telefunken Werkstattbuch
Wolfgang Bauer
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Just Qvigstad
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| Data Compliance |
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