Marconiphone pentode valve
- maker:
- Marconiphone Company Limited
Box containing Marconi valve
Possibly Type 6J7
Details
- Category:
- Radio Communication
- Object Number:
- Y7001.680
- Materials:
- cardboard, glass, plastic (unidentified) and metal (unknown)
- Measurements:
-
overall: 117 mm 37 mm,
- type:
- valve, pentode and thermionic valve