Okay, DX-40 mavens, let's see if you can help me. I've seen photos of the underside of various DX-40 chassis and it looks like there were two different circuits, mainly in the modulator section. I'm fixing up a DX-40 whose modulator section differs quite a bit from the schematic that I have, but the circuitry looks just like a bunch of the photos I've seen on line. I recall seeing a reference to there being two different circuits, but I can't find it. Can someone shed some light here? If there are two different circuits, which one is better and why?