Search:

Yep, certainly having fun!

I have a cat, but no motorcycle.

I started tracing out the schematic but then gave up after a confusing half an hour - the amp cost me nothing, I fixed it with 4...

But that's where I got it from!:D

Yes, no change in the result.



Oh yes - this is not my main amp at all, just one I picked up along the way. My original post was just a general throwing out of curious symptoms in case anyone...

I should have mentioned earlier that I have no idea what make this amp is. It's certainly not a high-end one. I got it at a yard sale, saw that the 4 rectifier diodes were blown, replaced them, and...

Thanks for all the excellent suggestions, but this one has got me really stumped. Here's a run-down:

1. With amp volume on zero, one of the JBL 4311Bs flaps a lot, the other flaps a little. i.e....

Thanks so much to all for yoru advice. I can't believe how easy the job was (changing the caps) after reading all the hints and tips on this forum. What did we do before the interwebs?!

IanG

When my 4311Bs are connected to the amp and the amp is on, both woofers are moving when no signal is applied and the volume is down - maybe 10-12 cycles per second. One of the woofers moves so much I...

Thanks for that quick reply, Thomas. How do you define "contact cement". I'm not in the USA so any pointers are welcome: brand, chemical makeup etc.


IanG

OK, so I removed the foilcals of my 4311Bs with ease using the suggested hairdryer-and-pallette knife trick. Whoever came up with that idea deserves a medal!

I have the foilcals stored between two...

Cheers Thomas.

Hi Thomas - thanks for your quick reply. Not sure if bypassed caps is what I mean here. To my understanding, a bypass cap is a small value cap placed across an existing cap to... do something that...

Greetings all!

I recently picked up a good pair of JBL 4311Bs in excellent condition. I remember this model well from working in studios in the 1980s.

Since purchasing them I have - of course!...