The 1AP5/P11 is a small flat faced instrument cathode-ray tube. It is probably from the 1950s and the P11 phosphor indicates a blue trace.![](../pics/acl0136a.jpg)
The anchor logo for the US Navy. Made in USA.![](../pics/acl0136b.jpg)
The faceplate is completely flat.![](../pics/acl0136c.jpg)
The 12 pin duodecal base.![](../pics/acl0136d.jpg)
The phosphor is 30 mm diameter.The end window envelope is 36 mm in diameter, and excluding the B12A base pins is 91 mm tall.Reference: Observation. Type 1AP5/P11 was first introduced in 1951. See also 1951 adverts. |
Updated May 26, 2019.
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