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Old 3rd July 2020, 04:00 PM   #141
duncan2 is offline duncan2  United Kingdom
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Its old fashioned flux used to help solder flow you could gently scrape it off.


They look okay but check close up to see if the solder flow changes color where the metal attaches to the solder .


You can re-flow it if you are still not sure.
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Old 3rd July 2020, 05:30 PM   #142
Fjellreven is offline Fjellreven
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Can i use fine sandpapir to scrape it off i tried with to scrape it off with a flat-head Screw driver and it managed to DAMAGE the circuit board.
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Old 3rd July 2020, 05:56 PM   #143
Fjellreven is offline Fjellreven
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And you know i was referring to the ones with the legs right?
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Old 3rd July 2020, 05:58 PM   #144
Fjellreven is offline Fjellreven
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Also Do i have to remove the old solder Completely.
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Old 3rd July 2020, 06:13 PM   #145
Fjellreven is offline Fjellreven
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Because when i made those two soldering joints i didnt remove all the old solder instead i just added more.
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Old 3rd July 2020, 06:23 PM   #146
duncan2 is offline duncan2  United Kingdom
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No you don't have to remove the old solder just make sure the solder flow adheres to the metal legs .


Yes I know you were referring to the ones with legs .
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Old 3rd July 2020, 07:01 PM   #147
Fjellreven is offline Fjellreven
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Wait do i have to remove the old flux or can i Just leave it there?
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Old 3rd July 2020, 07:49 PM   #148
duncan2 is offline duncan2  United Kingdom
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I just added new solder but if you want you can remove it just make sure the metal legs have a solid contact with the solder.
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Old 4th July 2020, 04:57 PM   #149
Fjellreven is offline Fjellreven
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Hey i accidentally dropped a film capacitor on the floor is it still usable. Also can i use the film capacitor like this you see i can't Mount the film capacitor on the rectifier board so my idea is to use a wire from the rectifier board to the 17 uf capacitor and then a wire to the speaker transformer.also can i Mount the 5 uf film capacitors upside down under the PCB.
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Old 4th July 2020, 06:01 PM   #150
duncan2 is offline duncan2  United Kingdom
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Film capacitors in radios usually serve either of 3 purposes .
Either its an interstage connection or its for smoothing purposes or its for cathode bypass .


Its possible its for a tone control (if fitted ) but in any case in a radio that operates at RF frequencies it should not be moved far away from its normal position otherwise you can get instability .


Unless you stood on it dropping it shouldn't affect it.
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