On Fri, 17 May 2013 02:39:15 +0100, "Arfa Daily"
wrote:

Yes, I don't think it is because they are fakes. They are made by a company
called Eurocap. I have never heard of them before.

Me too. However, it's a real company:
http://www.eurocap-int.com/
http://www.eurocap-int.com/main/electidx.htm
Still, you might want to compare photos of the electrolytics on the
data sheets with those you extracted.

The amp is actually quite
old, so I guess you could argue that they had reached the end of their
specced life. However, looking again at it today, it's one of those designs
where the entire case is a diecast heatsink, and there are no ventilation
slots at all.

Overheating will certainly boil off the electrolyte. That may explain
the massive capacitor failures. See any evidence of venting on the
electrolytics? Look at the base as well as the top.

I suppose that the interior probably heats up quite a bit when
the amp is doing some work, and it is this that has led to the demise of all
the caps.

When you get it working, give it a burn in test. If the original caps
were any good when new, your replacements will probably have a similar
lifetime.

I did the replacement today, and ran the ESR meter over them all again out
of circuit. The 2.2 u's were fairly consistent at around 16 ohms. The new
replacements were about 1.5 ohms. Not one of the 10u's and 22u's was less
than 60 ohms, and several were completely open.

Once they had all been replaced, both channels had identical output, and the
sine wave I put in it now came out totally clean.

Nicely done. Got time for an accelerated burn-in test?
--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558