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Between 325 °C and 345 °C. But, the higher the temperature, the faster the pace of work. I prefer higher temperatures and short soldering times. It's all a matter of practice.

I don't think you have damaged traces, rather cold solder joints or unwanted ground connections. It is possible to repair damaged tracks with jumpers as music6000 says. But there is no need to re-solder the joints with this type of circuit board. The holes are contacted to both sides anyway. The...

I can't find any fault. Try another Opamp first and than check all solder connections on the PCB back side. If none of the components are damaged, I'll bet there is an unwanted ground connection on the PCB. Does the led socket have contact with the pcb back side (solder joints)?

It's hard to tell without seeing the pics...

There is no need to use polarizied caps 220n. I've used wima film caps 220n in the tone stack. In my opinion the better choise in this position.

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No, just clean working only. It's a nice hobby.

Thank you, I love it clean. I use a cleaner called: Leiterplattenreiniger LS from Kontakt Chemie, germany.

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Taking photos is also a hobby of mine. I always try to give my best...

It's not a polish, it's a cleaner called: Leiterplattenreiniger LR from KONTAKT Chemie.

No, I use a thirty years old solder iron (weller wkcp-s) with a small solder tip. The key is the right solder (fluitin 1532/0,5mm) and temperature.

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Thanks! Yes, it's much easier to tailor the length. You also can change the led color without soldering...

Thanks! Yes, mostly I use vishay cmf-55 (0,5W). They fit everywhere without any problems.

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