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In Reply to: RE: Solder for a Rotel RB-1070 power amp ... posted by Crazy Dave on May 28, 2014 at 10:31:49
I am surprised I did not get an answer. I did an internet search and according to the resident experts on Head-Fi. It is fine to mix. The only issue is that it will not be ROHS compliant. However, on another site said that you could crack the board with uneven heating. If it is mixed thoroughly, it can be done. The safest thing to do is to keep it lead free. I do have a solder station with adjustable heat, so there is no reason why I can't use lead-free. It is just that I have no experience.
I do wonder if the reason this amp has received both damnation and praise is inconsistent sound due to poor solder technique. I was manufactured in China and I think previous Rotel amps were not. While the parts aren't stellar, I see nothing about the parts quality or layout that would indicate bad design or bad sound. I suspect I may be able get this thing to sound good!
Dave
Follow Ups:
I just found this (see link). Lead free it is! I will order some solder and start practicing. Any brand recommendations?
Dave
I'm guessing just touching up the solder joints won't do it. It would be lower on my priority list. Cold solders can be an issue but this thing is dead right? You said it doesn't power up so start at the power cord and trace through the power switch to the transformer primary and make sure voltage can get to at least there. Then check the transformer itself that the windings still show continuity. Did you see any fuses inside? The manual states there is internal fuse or fuses. Check that too. Good luck.
ET
Thanks for the advise. The order your suggest is very logical.
If I do have to re-solder, I will suck the old solder off and stick with lead free.
Since the power light doesn't light, it is probably at or before that light. There at least two fuses. Things are a little more complicated then usual because it has a remote turn on function that is operated with an umbilical cord from the preamp. You can turn this function off with a switch in the back, but it complicates the wiring. It is a possible point of failure.
I had left my multimeter at my mother's house when I was fixing something there. I will retrieve it this weekend and start poking around.
I am still hoping for an easy fix!
Dave
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