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EH90Sensibly equivalent¶ to:6CS6See also:
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The EH90 is an indirectly heated heptode mixer from the 1950's. In the early 1960's Mullard designed circuits for the EH90 so it could act as an FM demodulator for 6 MHz inter-carrier sound.This exhibit from Mullard features the later yellow paint to mark the envelope. See Mullard for why the yellow paint was used.See EH90 for full details.![](../pics/aaa1358a.jpg)
The side view of the anode shows the wire grids.The thin glass tube envelope is 17 mm in diameter, and excluding the B7G base pins is 46 mm tall.References: Data-sheet & 1040. Type EH90 was first introduced in 1954. See also 1954 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | ![](../static/key.gif) g1 | k,g5 | h | h | a | g2,g4 | g3 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | ![](../static/pdflogo.gif)
| 6.3 | 0.3 | 100 | 30 | -1 | 0.75 | 1.1 | 1M | 0.95 |
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Updated January 03, 2019.
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