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EC55Sensibly equivalent¶ to:See also:
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![](../pics/abn0080.jpg)
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The EC55 is a physically small disc seal triode valve, with co-axial connections. This type of planar valve evolved during WWII as an improved replacement for the CV90.The heater and cathode are connected via the lower co-axial connector the emitting surface is a flat topped thimble. The grid has a circular connection to the flat internal metal mesh. The anode is copper and has a flat surface facing the grid and positioned very close to it.A grounded grid configuration would allow for a two cavity mechanical design.This valve is rated at 600 MHz but its extended maximum frequency of 4 GHz made it a natural choice for microwave designs.See also CV273 for a view of the grid wires as these two valves have almost identical grid construction.![](../pics/abn0080a.jpg)
The anode end, showing the very small gap between anode tip and grid mesh.The planar envelope is 16 mm in diameter and, overall is 68 mm tall.References: Data-sheet & 1040. Type EC55 was first introduced in 1947. See also 1947 adverts. |
Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | mAa | Pout | Pdiss | freq | f.max | ![](../static/pdflogo.gif)
| 6.3 | 0.4 | 350 | 40 | 3 | 10 | 600 | 4000 |
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Updated August 12, 2021.
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