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EL821Sensibly equivalent¶ to:
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Type EL821 is a video output amplifier used in professional applications for driving TV or radar signals down (fairly) long cables. This exhibit is by Philips and made in Holland.Sources specifically list it as a video amplifier for high definition television. Note the high value of gm, necessary in order to obtain reasonable gain and power output with wide-band signals, and for correct matching of video into coax cable. TV studio equipment racks used to be full of these valves.![](../pics/aaq0284a.jpg)
The anode side view. The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins, is 59 mm tall.References: Data-sheet & 1040. Type EL821 was first introduced in 1962. See also 1962 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ![](../static/key.gif) ic | g1 | k | h | h | nc | a | g2 | g3 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | Pout | D | ![](../static/pdflogo.gif)
| 6.3 | 0.75 | 250 | 250 | -4.5 | 40 | 6 | 50,000 | 11 | 3W | 8.5% |
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PDF scanned from an original document held by the museum |
Updated January 08, 2022.
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