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Description  The UBC81 small double diode triode was designed for signal demodulation and AGC detection in universal mains domestic equipment. The triode section could be used for a first stage of amplification after the detection process.
Manufacturer Philips Miniwatt
BEL
Country of Origin Holland

India

Introduction Year 1954

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Description  Mullard describe the EF41 as a variable μ RF pentode for use as an RF or IF amplifier.
In the literature Mullard state that although pins 3, 4 and 7 are internally connected together, it is recommended that the external cathode connection be made to pin 7 as this point offers the lowest connection inductance.
Manufacturer Philips Miniwatt
Telefunken
Country of Origin Britain

*

Introduction Year 1947

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