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Allison 8 crossovers


intrique45

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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?

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19 hours ago, intrique45 said:

20200530_194310.jpg

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.

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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

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