intrique45 Posted May 31, 2020 Report Share Posted May 31, 2020 Hello again to all I have a set of Allison 8 speakers that may need a cap job Seems at certain bursts/spikes at mid volume the speaker looses volume and crackles There about 35 years old now Does anyone have a schematic of what caps I need to replace? Quote Link to comment Share on other sites More sharing options...
newandold Posted May 31, 2020 Report Share Posted May 31, 2020 19 hours ago, intrique45 said: Hello again to all I have a set of Allison 8 speakers that may need a cap job Seems at certain bursts/spikes at mid volume the speaker looses volume and crackles There about 35 years old now Does anyone have a schematic of what caps I need to replace? Doesn’t sound like a capacitor problem. Are these CD 8’s or the original Allison Eight? Any restoration done on the drivers? Before trying anything with caps., the slope switches should be cleaned first. The symptoms you describe are indicative of poor contact within those switches. You’ll need some Deoxit and Dust Off or equivalent. The Original Eight has a slider switch that is virtually self clearing by sliding back and forth many, many times. If you do this with soft music playing, you will hear the sound “recover” to normal. The CD8 has toggle switches that could be tricky to clean, but the same kind of operation applies. You can also pull a driver to get to the backside of the switches. Quote Link to comment Share on other sites More sharing options...
intrique45 Posted June 5, 2020 Author Report Share Posted June 5, 2020 Thanks I will try that They are CD8 I am also thinking that if its possible the ferrofluid dried up and may cause the problem Quote Link to comment Share on other sites More sharing options...
newandold Posted June 5, 2020 Report Share Posted June 5, 2020 3 hours ago, intrique45 said: Thanks I will try that They are CD8 I am also thinking that if its possible the ferrofluid dried up and may cause the problem Let’s hope the simplest answer (dirty contacts) is the correct one. your midrange uses ferrofluid but the tweeter is cooled with silicone grease. It is true that crackling sounds can be indicative of a driver failure, but see how the cleaning goes before sweating it. If it’s cooling material dried up causing the problem, I’m toast too! Not including the subwoofer I’m running 28 Allison drivers in my system.....so far so good. Bill Quote Link to comment Share on other sites More sharing options...
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