Hats off to the cap

[JerryT]

Originally Posted by john & Jake the dog

Hi,
Guy, don't know what happened, I'm sure the cap was ok when I received the amp from Ebay.
Rob, can't check the polarity as the markings are on the cap but it did and does play ok.
Phil, I'll swap the wiring and check the channel volumes.
I have the two Kel's wired so that each channel only drives one driver, left channel woofer, right channel tweeter on both amps.
I'll check the voltages.
cheers

To achieve this level of damage you have either overloaded the cap by a very significant amount - try 100V or more rather than 25V if that is it's rating OR it was reversed in the circuit.

Greg is right. This needs sorting. As amp plays apparently unaffected I'd look at the matching cap in the other channel to check it is OK, and then check voltages in the explosive channel.

Jerry

[john & Jake the dog]

hi Greg & Jerry,
I'll check your points in the morning but thinking back to last week there was a noise through the speakers for a couple of minutes, then it stopped and played normally.
I haven't had experience with this so called "motorboating sound" but the sound did sound like the putt putt of a motorboat.
Could this have been the cap giving up.
After checking voltages I'll source a new cap.

[RobHolt]

John, I have some Elna Silmic caps of the correct uf but higher voltage rating. PM if interested with address and I'll send them gratis.

[john & Jake the dog]

Hi Rob,
you have a PM, thanks.

[john & Jake the dog]

Hi Rob,
Parts recieved, many thanks, will keep me busy till the early hours no doubt.