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MKT4/5Sensibly equivalent¶ to:
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![](../pics/aby0001.jpg)
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The MKT4 was a beam tetrode version of the earlier (1932) MPT4 output pentode and was intended as a plug-in replacement, production of the MPT4 being discontinued.The main image shows the etched lozenge with the MKT4 designation in the centre. This is typical M-OV.The beam tetrode version gave slightly more output power than the pentode but with significantly lower distortion. Whether its performance was any better than that of Mazda's landmark (1930) AC/Pen is open to question!As the MKT4 was a plug-in replacement for the MPT4 pentode, the B5 base and side contact for the screen grid was the required configuration. Most MKT4's made were to this pattern. Later M-OV fitted the valve with a B7 base. Looking at the MKT4/7 one can see that the electrode assembly remained unaltered, just the base changed.In single ended audio configuration would provide an adequate 2.5 Watts.![](../pics/aby0001a.jpg)
The Osram and BVA logo's on the base.The classic envelope is 44 mm in diameter, and excluding the B5 base pins, is 103 mm tall.References: Data-sheet & 1043. Type MKT4/5 was first introduced in 1937. See also 1937 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | tc | ![](../static/key.gif) a | g1 | h | h | k | g2 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | gm | Pout | D | ![](../static/pdflogo.gif)
| 4.0 | 1.0 | 250 | 225 | -13.5 | 32 | 5 | 3 | 2.5W | 10% |
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Updated May 10, 2016.
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