Mullard thermionic valve

Made:
1930s in England
maker:
Mullard Limited

Mullard thermionic valve from National Valve Museum:

The 2D4A valve houses a pair of signal diodes with a common cathode. The valve design is from 1934 and the diodes would have been used for demodulation at, probably at around 455 - 500 kHz, the IF frequency of broadcast radio receivers.

Details

Category:
Radio Communication
Object Number:
Y1984.48.175
Materials:
glass, metal (unknown), plastic (unidentified)
type:
thermionic valve
taxonomy:
  • component - object
credit:
Gift of Dr. G. R. Airth
status:
Permanent collection

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