The MHL4 was used in professional and military applications over many years until it was superseded by the L63, which had comparable characteristics.![](../pics/abt0005a.jpg)
The electrodes: the mesh anode and getter support at the top. The cathode is connected at the opposite end to the heater making a long path.![](../pics/abt0005b.jpg)
The mesh annular getter holder.![](../pics/abt0005c.jpg)
Another view of the electrodes. The support is only from the glass pinch.The balloon envelope is 50 mm in diameter and, excluding the B5 base pins, is 114 mm tall.References: Data-sheet, 1040 & 1043. Type MHL4 was first introduced in 1929. See also 1929 adverts. |