Produced and sold by "Vox Sound Equipment Limited" in later 1969, metal grilles on the top and bottom of the cabinet (common to the earlier production solid state PA range). "Vox Sound Limited" introduced plastic vents. The latest observable date codes are on the original Siemens 2N4347 power transistors: "6937" = 37th week of 1969. The red CCL capacitors have "D9" = April 1969 for their manufacture. Thanks to Mark for the pictures.

The mains transformer is marked "ZD233", as also in the case of later PA50SS illustated on this page (where dimensions of the cabinet and so on are given).