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EF55Sensibly equivalent¶ to:
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The EF55 pentode is physically the big brother of the EF50 with which it shares common base connections. The EF55 is a single ended RF pentode with very high mutual conductance and a sharp cut-off. It was designed for video frequency use, probably in RADAR service, and its service code was CV173It is an early all glass constructed valve with equi-spaced pins and a spigot for location into the valve holder.The current rating places it as a power valve but it is designated for amplifier service with a medium anode impedance.The outer aluminium shield is 33 mm in diameter. The overall length excluding the B9G base pins, is 79 mm.References: Data-sheet & 1040 Type EF55 was first introduced in 1946. See also 1946 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |  h | g2 | a | g3 | s | k | g1 | s | h |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | 
| 6.3 | 1.0 | 250 | 250 | -4.5 | 40 | 5.5 | 55k | 12.5 |
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Updated December26, 2011.
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