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5B/250ASensibly equivalent¶ to:See also:
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The 5B/250A is an 807 with a ceramic base cap for added moisture resistance and a maximum anode voltage of 600 Volts compared to the 400 Volt anode maximum for the original 807.The parameters given are for single ended use. When used in a class AB1 as a push pull pair with 600 volts on the anode an output power of 65 Watts was normal.
The 5B/250A Type designation is of the STC name style and Brimar is the consumer brand of STC.The classic envelope has a maximum diameter of 51 mm and a length, excluding the UX5 base pins, to the tip of the top cap of 128 mm.References: Datasheet & 1040. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | tc |  h | g2 | g1 | k | h | a |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | Pout | 
| 6.3 | 0.9 | 600 | 300 | -14 | 83 | 8 | 20k | 6.0 | 6.7W |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | mAg | Pdriv | Pdiss | Pout | freq | f.max | 
| 6.3 | 0.9 | 600 | 250 | -45 | 100 | 7 | 3.5 | 0.2W | 25W | 40W | 60 | 125 |
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Updated July 20, 2017. shape:classic construction:pinch type:beam.tetrode age:1940.1950 base:ux5 heater:6.3v pins:5 pin:1.h pin:2.g2 pin:3.g1 pin:4.k pin:5.h pin:tc.a
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