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    Posted: 27 February 2023 at 7:13pm
The amp was designed in 1995 , if the main caps have been changed at some point they were 10000uf originally.
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Originally posted by Earplug Earplug wrote:

"Thanks, which ones in particular do you think could be troublesome?"

I'm talking about the smaller blue ones close to the heatsink. They have "slots" on them already, which are there to open up if the capacitor fails due to some stress, excess voltage, etc.

In that case, they will ooze out some muck, or splatter debris around, which obviously has not happened, but worth checking as at least one seems to have a large dent on the top

I wouldn't bother too much with the larger filter caps. They look fine and most probably still have a good few years of life in them, but given what you paid for the amp, maybe worth getting it all checked out by a (qualified) service engineer.   Smile





Thanks I might just do that, I know some basics but wouldn't like to attempt to do too much myself. I'm glad you guys find this Amplifier interesting, pretty cool what you can find for cheap on eBay 


Edited by digitalfield - 25 February 2023 at 10:07am
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Points: 7216 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 25 February 2023 at 9:49am
"Thanks, which ones in particular do you think could be troublesome?"

I'm talking about the smaller blue ones close to the heatsink. They have "slots" on them already, which are there to open up if the capacitor fails due to some stress, excess voltage, etc.

In that case, they will ooze out some muck, or splatter debris around, which obviously has not happened, but worth checking as at least one seems to have a large dent on the top.

I wouldn't bother too much with the larger filter caps. They look fine and most probably still have a good few years of life in them, but given what you paid for the amp, maybe worth getting it all checked out by a (qualified) service engineer.   Smile
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Originally posted by simonp1100 simonp1100 wrote:

Originally posted by digitalfield digitalfield wrote:

Originally posted by Pinyorouk Pinyorouk wrote:

Feel for any unevenness on top of those blue capacitors. This indicates that the capacitors could be drying out which would result in less capacitance or higher ESR.
Thanks for the tip, I'll have a look at those. Another interesting thing I noted was it had 1995 stamped into the PCB. I'm guessing the year it was made. To me those blue caps look almost new. Maybe they have been changed in it's lifetime.
Are the caps 4700uf 100V claw type mounting by any chance ?.
I'm not quite sure to be honest, but I can get some closer pictures for you later if you like. 
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Originally posted by digitalfield digitalfield wrote:

Originally posted by Pinyorouk Pinyorouk wrote:

Feel for any unevenness on top of those blue capacitors. This indicates that the capacitors could be drying out which would result in less capacitance or higher ESR.
Thanks for the tip, I'll have a look at those. Another interesting thing I noted was it had 1995 stamped into the PCB. I'm guessing the year it was made. To me those blue caps look almost new. Maybe they have been changed in it's lifetime.
Are the caps 4700uf 100V claw type mounting by any chance ?.
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Nice layout inside & love the V shape heatsink, Looks very "C-Audio" ish to me. 
I am sure that someone at at Austin Armstrong had a link with C-Audio at some point. Maybe someone on here can verify this ?. Smile
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Originally posted by Pinyorouk Pinyorouk wrote:

Feel for any unevenness on top of those blue capacitors. This indicates that the capacitors could be drying out which would result in less capacitance or higher ESR.
Thanks for the tip, I'll have a look at those. Another interesting thing I noted was it had 1995 stamped into the PCB. I'm guessing the year it was made. To me those blue caps look almost new. Maybe they have been changed in it's lifetime.
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Feel for any unevenness on top of those blue capacitors. This indicates that the capacitors could be drying out which would result in less capacitance or higher ESR.
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Originally posted by Contour Contour wrote:

I like it with that V-shape inside, looks cool. 

Yeah when I opened it, that's the first thing I noticed. Looks very well designed and it's built like a tank.
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Originally posted by Earplug Earplug wrote:

Yes, that looks very clean - and neat, definitely.

One, or maybe 2 of the caps in the "V" of the heatsink do look like they've taken a knock. Maybe worth checking those.



Thanks, which ones in particular do you think could be troublesome? I'm not quite sure how I'd go about checking them and where I'd get replacements. I'm not a service engineer. I actually picked this amplifier up for £45. Bought it because I thought it was interesting. It seems to work ok, although I haven't tried it on a big rig yet. I only had some small speakers to connect it too. It seemed rather quiet which is why I wanted to know the wattage. The speakers I connected it too were quite small though, plan to connect it to some 600w subs and tops, see how it handles those. There is no volume levels, only input levels on the rear.


Edited by digitalfield - 25 February 2023 at 9:11am
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Yes, that looks very clean - and neat, definitely.

One, or maybe 2 of the caps in the "V" of the heatsink do look like they've taken a knock. Maybe worth checking those.
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I like it with that V-shape inside, looks cool. 
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