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The type Z66 was M-OV's late-1940s in-house attempt to make a small, modern high-slope pentode for wide-bandwidth IF systems in TV and radar, where bandwidths of several MHz were required. In this example the lettering is contained within the typical M-OV oval.

To ensure that the valve would be cheap and easy to make, a 'pinch' construction was used that could be assembled on existing production line machinery. Sadly the Z66 was very much a 'second best when it came to performance, particularly in terms of gain-bandwidth product and high-frequency noise figure.

The three wire grids can be made out within the anode cavity.

The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 78 mm tall.

References: ¹⁰⁴⁰ & ¹⁰⁴³. Type Z66 was first introduced in 1948. See also 1948 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶