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The Dawn of Broadcasting in the UK
collections HMS Collingwood Museum |
The B5 triode is from the mid 1920s and is marked with the BBC stamp. The base is B4 and the filament required 3 Volts. The envelope is opaque an no details are visible above the pinch.
The balloon envelope is 35 mm in diameter and, excluding the B4 base pins, is 83 mm tall.
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This exhibit was last updated on 18 January 2004
The balloon envelope is 35 mm in diameter and, excluding the B4 base pins, is 83 mm tall.
More
This exhibit was last updated on 18 January 2004
This exhibit was last updated on 18 January 2004
This exhibit was last updated on 18 January 2004 |