|
6K8Sensibly equivalent¶ to:CV1945See also:
|
|
|

|
The 6K8 triode hexode valve was purpose designed as a radio frequency changer. The valve has a common cathode and is unusual within our collection in that the triode and hexode control grids are internally connected.The local oscillator would produce 7.5 Volts peak to peak signal from the triode section.The input signal would be coupled to the frequency changer via the top cap connection to grid 3.As a metal enveloped valve the top cap connection is interesting. The connector is standard but is set in an insulating disk that is then sealed into a shaped end of the envelope. This appears quite difficult to manufacture.
The diagram shows the arrangement of the electrodes within the steel shell. This ingenious arrangement avoids the large number of concentric grids used in other mixer designs.The thin metal tube envelope is 25 mm in diameter and excluding the IO base pins, is 60 mm tall.References: Data-sheet & 1040. Type 6K8 was first introduced in 1938. See also 1938 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | tc |  m | h | a | g2,g4 | g1(t),g1 | a(t) | h | k | g3 |
|
|
Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | 
| 6.3 | 0.3 | 250 | 100 | -3 | 2.5 | 6 | 0.6M | 0.36 |
|
Absolute Maximum Operating Conditions¶
| Va | mAa | 
| 100 | 3.8 |
|
Updated October 22, 2016.
|
|