History of Science Museum: Collection Database Search

Narratives

Technical Details

Mullard designated the EF37A as high gain, high impenance pentode for use in AF pre-amplifier stages. The electrode system was of anti-microphonic construction, and the specially designed heater reduced hum to negligible proportions. High quality amplifiers used the EF37A for many decades with the EF86 as its successor.
Data sheets also gave parameters for use as a triode.

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