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ARDE

Dull Emitter Triode

ARDE
Early getterless version.
ARDE ARDE
Later gettering was introduced.
ARDE
The typical 'R' type electrode assembly.
ARDE
Two examples with an original box..

The very earliest LF examples (not shown) have metal bases. Both of these are HF versions, used for RF amplification or detection.

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