The caps you have there are original. All altec crossovers from that era used those black caps with red ends. So I don't think anyone had changed values. I'm betting the blowed up one is the shunt cap that goes across the woofer. Which means someone really cranked the volume!

I don't think you would gain anything by replacing the resistors. They certainly shouldn't be getting hot.

Is that JBL woofer some sort of high powered deal? If someone had these up loud enough to pop that cap, I wonder how the hf fram survived?

I have a pair of the 9849's and I hate to adnit that I've never listened to them......

Ron


Quote Originally Posted by Corona Blue View Post
Hi Earl K-

Thanks for the link and for looking around for the schematic. I looked before I posted. I must commend you guys for having such a nice library of documents!! Very handy!

The resistors I saw all looked like 10w ceramics... going from memory here... 2 x 5ohm in series and an 8ohm. I will verify how they are wired.

I'm just wondering if it might be worth changing out the ceramic resistors for non-inductive 25w (finned aluminum) resistors that I can bolt to the box for extra cooling. These would have the additional benefit of being much smaller than the huge ceramics.

The 18uf cap that exploded was installed right up against one of those ceramic resistors. I can't imagine the heat would have done it any good. I have no idea how long it was like that. I have not used these speakers much since I have had them.

I was hoping to have a look at a schematic of the network to verify if it has been altered. Just wanted to know. If I get a free hour, I will attempt to derive it for the group.

Best,

Allen