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805Sensibly equivalent¶ to:331A CV625
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The 805 is an HF transmitting triode rated for use up to 30 MHz.The operating conditions are for Class C service. The control grid current is up to 40 mA.The anode is milled (expensively) from a graphite block. One advantage is that this can be baked at a very high temperature during manufacture in order to expel contaminants and occluded gases. We believe it to be a direct ancestor of the 813 (also TT10).The short stub pins may have been designed to fit into a bayonet fitting with spring clips to make contact with the pins.The wide glass tube envelope is 55 mm in diameter and excluding base pins it is 194 mm tall.References: Data-sheet & 4061. Type 805 was first introduced in 1936. See also 1936 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | tc |  f | ic | 3 | g1 | a |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | Pdriv | Pdiss | Pout | μ | 
| 10.0 | 3.75 | 1500 | -105 | 200 | 8.5W | 125W | 215W | 50 |
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Updated February 14, 2013.
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