| 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
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| Introduction Year | 1947 |
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