The A.D. 8882B revisited (/cont)

The plot thickens ...

January 2012 ... I recently ‘stumbled’ upon the above intriguing photograph. Anyone familiar with the R1155/AD8882B will instantly notice various mechanical inconsistencies. With the exception of the type-13 tuning knob, the rest of the front panel controls are all different. I have labelled the four most obvious ‘variations’ A through D. ‘A’ is very likely the ‘hum filter’ switch in a different location. ‘B’ and ‘C’ are clearly the ‘Heterodyne’ and ‘Switch Speed’ controls. All three switches are not the usual toggle type but turn-type ... or so the photograph suggests. However the familiar Jones connectors (‘D’) have been ‘replaced’ by something completely different. The Website on which I found this photograph states that this specimen was manufactured in Spain in 1937. And gives the serial number as 54772. I have reason to believe that whereas the serial number may well be correct, the date of manufacture of 1937 is highly dubious since Marconi were not contracted to develop the type until late 1939. There is a possibility that the date of manufacture might be 1947 ... But then why does it sport the early type-13 tuning drive that was replaced in 1942, and the dubious vernier scale that was probably omitted as early as 1941?

Also, bear in mind that Britain was at war when the type was developed in response to an Air Ministry directive and therefore the design would NOT be shared with a then fascist, albeit neutral state. It might be that what we are looking at here is an example of  a pre-production prototype; hence the already outlined differences, and that it was sold on to the Spanish after the end of hostilities. I have it on good authority that a number of R1155s with Spanish labelling turned up in South America some time ago. If anyone can shed any light on this curious example please get in touch with me here.

Spanish A.D. 8882B