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Old 18th May 2014, 05:17 PM   #1
4krow is offline 4krow  United States
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Default Forte model 3

I intended to do the right thing by replacing the old power supply caps in my model 3 amp. What I found were some caps that are much bigger in value and size, and voltage. The originals are 24,000 with a 60 volt surge rating. The new ones are 37,000 with a rating of 100V. After replacing the caps, the amp immediately blew the 8 amp main fuse. I then put a 6 amp current limiter in the incoming AC line after the fuse. It still blows the main fuse. I am thinking that I would be better off just getting 24,000 uf caps of the same voltage rating and calling it good. Any thoughts?
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Old 18th May 2014, 05:38 PM   #2
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Unless your new capacitors were installed incorrectly (or are bogus), they are not what is blowing the line fuse.
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Old 18th May 2014, 06:22 PM   #3
Zen Mod is offline Zen Mod  Serbia
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pics , please
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Old 18th May 2014, 10:00 PM   #4
4krow is offline 4krow  United States
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"Unless your new capacitors were installed incorrectly (or are bogus), they are not what is blowing the line fuse."

I do agree with your assessment. Think that I might take a second look. Just didn't think that there would be a huge increase in inrush current. Thanks for the thought.
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Old 18th May 2014, 10:05 PM   #5
4krow is offline 4krow  United States
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Default PICS

Yah, I almost for got the pics. I can get a better P5180034.jpgclose up if that helps.
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Old 18th May 2014, 10:19 PM   #6
4krow is offline 4krow  United States
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Default 2 Nd photo

Maybe this is a little better. I have not tied leads in until I have success with the amp.
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Old 18th May 2014, 10:20 PM   #7
Zen Mod is offline Zen Mod  Serbia
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recheck polarity of those caps

I hope you took some pictures , prior to replacing caps , as guide
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Old 18th May 2014, 10:27 PM   #8
gary s is offline gary s  Australia
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It looks like the caps in the rear of the photo are installed with the wrong polarity as the blue wire is connected to the positive cap terminal - I would have thought the blue wire would be the negative supply voltage.

Gary..
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Old 18th May 2014, 10:38 PM   #9
4krow is offline 4krow  United States
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AHA! Gary, let me double check a photo of the power supply that I say elsewhere. I think that you are correct sir. This does not really surprise me as I tend to do mirror image work usually, but this one doesn't work that way.
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Old 18th May 2014, 10:45 PM   #10
4krow is offline 4krow  United States
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Default 3rd foto

Sorry if this is a repeat. A view from the rear of the amp. I made a few changes over the years, and this time was the cap change. I love my 'little' Forte'.
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