- Title:
- NT46 or NT57 silica triode valve from the early ground radar transmitter type TF3
- Object name(s):
- radio valve; radio valve
- Brief description:
- NT46 or NT57 silica triode valve from the early ground radar transmitter type TF3, 1936. Silica (fused quartz) had been used for the envelopes of high-power valves since about 1918, particularly for naval transmitters. Silica softens at a much higher temperature than glass, so the valves could dissipate more power. The valve had smaller interelectrode capacitance and higher emission than the earlier design of silica valve it replaced and it was found possible to increase the emission still further by using a filament voltage 10% above the rated value. A pair of these valves could produce peak power outputs of up to 40kW.
- Collection:
- Science Museum Group
- Credit line:
- Air Ministry (WC2)
- Material:
- glass
- Material:
- metal (unknown)
- Object name:
- radio valve; radio valve
- Object production date:
- Date - earliest / single:
- 1936
- Date - latest:
- 1936
- Object production date:
- Date - association:
- made
- Date - earliest / single:
- 1936
- Date - latest:
- 1936
- Object production place:
- England, United Kingdom
- Other number:
- 1947-137/2
- Other number type:
- accession number
- Other number:
- 127/51/1
- Other number type:
- file number
- Responsible department/section:
- SCM - Radio Communication
Persistent shareable link for this record: https://museumdata.uk/objects/b066e412-d084-3528-8c72-cca0ff793a1e
Use licence for this record: CC BY
Attribution for this record: https://museumdata.uk/objects/b066e412-d084-3528-8c72-cca0ff793a1e, Science Museum Group, CC BY
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