The De Forest DL series first appeared in 1926. The L references the use of the UX4 base.The DL-14 was designed as a low μ audio output valve. 
The original box for the DL-14.Thanks to Joe Gruber for sending the images.The envelope is 32 mm in diameter and, excluding the UX4 base pins, is mm tall.Reference: Bill Condon & Joe Gruber. |
Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | μ | 
| 5.0 | 0.5 | 180 | -40.5 | 15.0 | 2,600 | 1.1 | 3.0 |
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Updated September 22, 2020.
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