The W61 is a post war variable mu RF pentode for broadcast receivers. Here the valve is branded Osram.The grid bias range is given as -3.0 to -25.0 Volts.Thanks to Graham Vine for sending this image.The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 96 mm tall.References: 1043. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |  m | h | a | g2 | g3 | nc | h | k |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm |
| 6.3 | 0.3 | 250 | 80 | -3 | 8.5 | 2.8 | 0.6M | 2.9 |
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Updated January 08, 2022.
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