The VMP4 or VMP4K is a variable μ screened amplifier pentode for RF and IF amplification in superhet receivers. This exhibit is the Catkin version and internally is totally different to the glass replacement the VMP4G.![](../pics/aaj0131a.jpg)
The seven pins fit into a Paxolin support and a composition base.![](../pics/aaj0131b.jpg)
The Catkin label and Osram branding.![](../pics/aaj0131c.jpg)
The top cap is fixed and not screw on.![](../pics/aaj0131d.jpg)
The B7 base.The envelope is 39 mm in diameter and, excluding the B7 base pins, is 115 mm tall.References: Data-sheet & 1043. Type VMP4 was first introduced in 1934. See also 1934 adverts. |