The EC903 is a high frequency triode for television front end use. The grid is connected to pins 2 and 6 and these are opposite one another on the base. Similarly the anode is connected to opposing pins 1 and 7. The anode voltage is 100 V and the control grid should be -6 to -2 V.
The construction is substantial for a small signal device. The anode dissipation is 2 watts and this also seems high until one realises that the noise figure is reduced as the anode current is increased. Thus this is a low noise. by valve standards, UHF device and was probably run in a cascode configuration.The thin glass tube envelope is 17.7 mm in diameter, and excluding the B7G base pins is 36 mm tall.Reference: 3002. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |  a | g1 | h | h | k | g1 | a |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | gm | μ |
| 6.3 | 0.2 | 6.0 | 15 |
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Updated April 13, 2013.
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