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MKT4/7Sensibly equivalent¶ to:
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The valve shown is an MKT4/7, i.e. fitted with a B7 base cap. Most MKT4/5's were fitted with B5 base caps with the screen grid connected to a side terminal.The MKT4 shown in the photo is a late (c. 1950) specimen and has a distinct Cossor look about it. It is probably a Cossor MP/Pen re-labelled as an M-OV valve.The MKT4 was listed as a beam tetrode but this exhibit is a pentode with three wire grids.In single ended audio configuration would provide an adequate 2.5 Watts.Some pre-war EMI television receivers used the MKT4/7 as a line output valve.It was a design that was produced by several different manufacturers. Note also that MP-Pen, MPPen, MP/Pen are variants describing the same type of valve.The classic envelope is 53 mm in diameter, and excluding the B7 base pins, is 110 mm tall.References: Data-sheet, 1043 & 1040. Type MKT4/7 was first introduced in 1937. See also 1937 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | nc | g1 | g2 | h | h | k | a |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | gm | Pout | D |
| 4.0 | 1.0 | 250 | 225 | -13.5 | 32 | 5 | 3 | 2.5W | 10% |
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Updated January 03, 2022.
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