Quadrature detector coil

Here are photos of the elusive 235SU1 coils. One will be disassembled in the name of science!

235su1.jpg

235su1_11.jpg

It can be seen that the primary coil has the tuning slug pulled out a bit. This kind-of agrees with parts of the earlier analysis of the two coils, assuming that the two slugs are of the same material. I found this image from this website, of the Carver TX-2:

carver_tx2.jpg

Here is an image of the inside of a NAD 4130 (detailed image). Also the balun for the antenna can be seen at the top-left of the image, made using some parallel pair of wire – nice!:

nad_4130_la1235_red.jpg

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