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EBF89Sensibly equivalent¶ to:6DC8 6FD12
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The EBF89 features two signal diodes and a variable μ pentode in the one envelope and sharing a common cathode. The diode anodes are small plates placed either side of an extended cathode tube.The variable μ characteristic is indicative of a device designed to have its gain controlled by an AGC system. This places this valve in service as a final IF amplifier and detector. Or with a separate detector the two diodes can provide a delayed AGC voltage. This would give full amplification until a threshold is reached. The high impedance of the pentode supports the case for use with a tuned circuit connected to the anode.The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins the valve is 57 mm tall.References: Data-sheet & 1040. Type EBF89 was first introduced in 1954. See also 1954 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |  g2 | g1 | k,s | h | h | a | a(d1) | a(d2) | g3 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | 
| 6.3 | 0.3 | 250 | 100 | -2 | 9 | 2.7 | 1M | 3.8 |
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Updated January 29, 2013.
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