Miniature wire ended valves, like the 505AX were developed in WWII for military use, and for hearing aids.This valve could have found use as the first stage of a hearing aid.The thin glass tube envelope is an oval tube 9 x 7 mm, and excluding the wire leads is 30 mm tall.Reference: Data-sheet. |
Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | 
| 0.625 | 0.03 | 22.5 | 22.5 | -1.25 | 0.2 | 0.08 | 2M | 0.15 |
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Updated April 26, 2013.
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