I am trying to restore my Grandfather's old Telefunken Opus 6 (1955) to working order, and have a few questions. All the "experts" say to start by replacing all the electrolytic capacitors and the selenium rectifier. Since these are no longer available, they suggested using a silicon bridge rectifier with a dropping resistor rated at 100 ohms @10 watts. I assume (did I say that I am NOT an electronic engineer) that the resistor would be connected in series with the output of the bridge, but rather than do damage to the radio, I have chosen to appear stupid and ask someone that knows for sure. Also, there are a couple of 50MFD caps in it that I have been unable to locate so far. Would a 47MFD work as a replacement? Thank you in advance for your help with this!