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6B8Sensibly equivalent¶ to:See also:
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The 6B8 American metal valve is a double diode pentode. Such valves were made for the signal detector, AGC detector and first audio amplifier stages of superhet receivers usually as a double diode triode. This valve with a vari-μ pentode offered the set designer the option of using this as final IF stage plus detectors. For local reception a pentagrid converter (heptode), this valve and sensitive output valve may have been all that was required apart from a rectifier.The 12C8 is electrically identical but has a 12 volt heater.The thin metal tube envelope is 24 mm in diameter and, excluding the IO base pins, is 62 mm tall.References: Data-sheet, 1040 & 1043. Type 6B8 was first introduced in 1937. See also 1937 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | tc |  m | h | a | a(d2) | a(d1) | g2 | h | k | g1 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | 
| 6.3 | 0.3 | 250 | 125 | -3 | 10 | 2.3 | 0.6M | 1.33 |
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Updated January 28, 2013.
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