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In Reply to: RE: UF1007 vs UG1007 posted by Eli Duttman on October 18, 2016 at 12:48:50
A quick (not exhaustive) check of the characteristics suggests they are indistinguishable from each other at low currents. If they are germanium then they should have lower voltage drop, but both are rated for 1000 volts and 1 amp, which doesn't sound like germanium to me, especially in a DO-41 package. But I'm not familiar with germanium diodes above the little signal-level ones.
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What do you mean by "demod diodes"? Are they in a tuner circuit? Are these perhaps the diodes in the stereo demux section?I agree with the other advice saying leave them alone. If they are functional, nothing good will come from substituting alternate parts in RF circuits.
Basic rule of vintage HiFi work: Rebuild the amp and preamp as much as you want. Stay out of the RF circuits unless you know how they work and have the test gear to perform a FULL FACTORY ALIGNMENT.
Even bending or moving of some parts in the front end can alter performance. If you see what looks like test points, a wire just sticking up on a board, this is probably what is called a gimmik. It's actually a capacitor and moving it will cause trouble. Yes one end is not connected to anything but then RF is weird. And it is actually connected via RF.
Edits: 10/19/16 10/19/16 10/19/16
...and every single one of them is in a low level RF/IF/discriminator position. Probably germanium and best left alone if not outright defective...as others have already pointed out.
Yes, wise choice. I'm no expert on solid-state devices. If it were me and I needed to swap out the original ones. I'd go with as close to OEM as possible. Just to avoid "post-fix weird, symptom" headaches.
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