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DF66Sensibly equivalent¶ to:CV2107
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The DF66 is a sub miniature audio amplifier pentode. The design was specifically for hearing aid use where the HT would be supplied by a 22.5 volt battery.The red paint spot identifies the position pf wire 1.
The anode is 8 mm long and the grids can be seen through the hole in the side of the rounded anode.The thin glass tube envelope is 8 x 5.5 mm in, and excluding the base wires is 25 mm tall.Reference: Data-sheet. Type DF66 was first introduced in 1951. See also 1951 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 |  a | g2 | f+ | g1 | f-,g3 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | 
| 0.625 | 0.015 | 22.5 | 22.5 | -1.05 | 50μ | 15μ |
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Updated August 25, 2019.
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