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Old 2nd Mar 2021, 4:05 pm   #2163
slidertogrid
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Join Date: Apr 2005
Location: Peterborough, Cambridgeshire, UK.
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Default Re: The Audiophoolery Thread.

Quote:
Originally Posted by vidjoman View Post
Looking at the circuit boards on the photos in post 2097 it looks like the transistors around the centre of the board run hot as the board is discoloured. As it is mounted upside down the heat will rise and cook the board and in time will make the solder joints fail. Leaving on all the time will help it to fail even quicker. There are many noticeable poor solder joints visible in those photos, but then maybe wrapping one wire around another to make a good mechanical connection before soldering might cause unwanted sound effects.
Yes I thought exactly the same thing and as the board is fiberglass I thought they must be getting really hot to scorch that.... However on closer inspection the PCB is just coloured red on the reverse which looks like scorching. Its a triangular pattern . That said those tiny little transistors do run hot!
Another strange thing is that some of the electrolytics are wrapped in insulation tape others are not....
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