[R-390] Unusual? Front panel

[Charles P. Steinmetz]

Miles wrote:

>Does anybody have a photo of the Columbia Electronics subassembly?
>Can anybody provide a schematic of the modification?

As others have said, the product detector is covered in Paolo 
Viappani's book, with schematic.  The schematic is marked and 
annotated in English.  It has also been discussed on this list 
several dozen times over the years.  Get the book and/or search for 
archived list messages.

Best regards,

Charles