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DD620Sensibly equivalent¶ to:
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A pair of signal diodes are to be found in the DD620, A Mazda valve from 1934, intended for use in universal mains sets (transformerless for AC or DC use). For this application the heater cathode insulation has been designed to withstand a high voltage difference.The large canopy is a screen, the two anodes are within. The lower anode is visible, but the top anode is hidden under the screen.The envelope on this exhibit is some 9 mm shorter than our other DD620.The balloon envelope is 40 mm in diameter and, excluding the B5 base pins, is 73 mm tall.References: Data-sheet & 1040. Type DD620 was first introduced in 1934. See also 1934 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | a(1) | a(2) | h | h | k |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | mAa |
| 6.0 | 0.2 | 0.5 |
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Updated February 20, 2013.
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