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grundig vestel ak49-7 whining through speaker

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ernie:
this grundig has a faint whining noise coming from the speakers even with the volume turned right down it lasts for about 25 mins then seems to be ok the sound on the tv is ok but its got this noise in the background untill it has been on for awhile,does this sound like a cap warming up if so which part of the cicuit would it be on or could it be something else,any help appreciated

mulja:
Do you have service manual for AK49 post here
I will take look what can couse whis problem?

ernie:
no sorry i cant seem to get a manual for it.i said whine but it is more of light whistle and after awhile it stops whistling it looks like a job for the freezer spray and hairdryer.let you know if i find anything     ernie.    i have just downloaded a service manuel for the ak49 from eserviceinfo.com.but i dont know enough about computors to send it to this site,if you can tell me how to do it i will send it   ernie

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