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EBL21Sensibly equivalent¶ to:
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The EBL21 is one of very few double diode audio output pentode valves that were designed. It would have needed considerable drive at the intermediate frequency and the output pentode is of high gain to allow the use a a single stage from detector to output transformer.Above the base is a dark plate, this screens the diodes from the pentode anode connection.
Above the base can be seen the coiled heater wires entering the cathode tube. Also visible is the thin cathode connection wire. Just above the base of the cathode is a small bright plate - one of the diode anodes. The other diode anode is on the opposite side of the flattened cathode. The control grid supports are copper and there are heat radiating fins above the top mica.The wide glass tube envelope is 27 mm in diameter and, excluding the B8B base pins, is 77 mm tall.References: Data-sheet, 1040. Type EBL21 was first introduced in 1941. See also 1941 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |  h | a | g1 | g2 | a(d2) | a(d1) | k | h |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | Pout | D | 
| 6.3 | 0.8 | 250 | 275 | -6.2 | 44 | 5.8 | 50K | 9.5 | 5.5 | 10% |
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Updated January 24, 2024.
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