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Old 16th May 2009, 07:08 AM   #1
kerux is offline kerux  United States
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Default simple se c1 capacitor blew

I powered up my simple se for the first time today. After the pop noise and the smoke cleared. I turned it upside down and saw the c1 capacitor blew.

I did the inverted assembly method. I disassembled and I see that it was correctly installed. I attached a picture too and it matches tubelab's capacitor page that has the pictures.

Any help is appreciated before I try again.

Andy
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Old 16th May 2009, 10:25 AM   #2
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The picture is too fuzzy to be able to read the polarity on the capacitors, but the negative terminals should be facing each other. Was the capacitor the correct voltage rating?

It also looks like you have a choke installed across the L1 connectors. What does the rest of the power supply look like. Did you make any changes?
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Old 16th May 2009, 01:46 PM   #3
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Yes. the picture is a bit fuzzy. Use a macro setting on your camera if it has one. There is usually a little icon which looks like a flower.

The polarity on the caps look correct. The top of the cap seems to be the metal type with the X shaped rupture notch stamped in. My C1 cap has a plastic disc on top. I wonder if you got the correct voltage rating on C1.

I can see you did not install the FREDs. That is good. Installing them backwards will cause blown supply caps.

What is your power transformer? Did you have the power tubes (EL34, 6L6, 6550, KT88, etc.) installed when C1 popped? The B+ voltages are much higher when no power tubes are installed. I seem to recall that if I run mine with no power tubes, my Hammond 374BX will develop voltages in excess of the capacitors rated continuous working voltage (over 500 VDC). The caps should be able to handle some additional surge voltage for a short time (see the mfg's datasheets for details).

Here's a pic of the bottom of my Simple SE board. I also opted for the under chassis mount.

Click the image to open in full size.
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Old 16th May 2009, 02:19 PM   #4
kerux is offline kerux  United States
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Default simple se c1 capacitor blew

I have a hammond 374bx with KT88 tubes installed when I powered up.

The capacitor was a 47uf 500v capacitor. That I got off the part list.

After doing some checking, I realize I forgot to put the fuse into the IEC fuseholder. I have a digital multimeter so I will try to test for shorts as I have seen in other posts.

Thanks for your help.
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Old 16th May 2009, 03:59 PM   #5
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Default Re: simple se c1 capacitor blew

Quote:
Originally posted by kerux
After doing some checking, I realize I forgot to put the fuse into the IEC fuseholder.
You have a serious wiring error, which may result in damage to the amp, fire, or death.


If there is no fuse in the fuse holder, there should be no possible way for power to get into the primary of the power transformer. Nothing should be energized with no fuse.
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Old 16th May 2009, 05:14 PM   #6
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I have an IEC in which the fuse leads are touching each other, on a spring. It can be used without a fuse. When you insert the fuse it separates the leads to each end of the fuse. But be absolutely sure this is the case in your amp.
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Old 16th May 2009, 05:38 PM   #7
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Default Wiring Error

Perhaps you fused the neutral?
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Old 16th May 2009, 08:38 PM   #8
kerux is offline kerux  United States
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"Perhaps you fused the neutral?"

I think this is part of the problem. I spoke to my dad and explained some of the wiring I did and he said it is not correct for the switch. I realize how to fix part of the switch wiring.

After more discussion with dad, I don't understand all of the necessary wiring so I will try to get someone professional to help out.

I have looked at tubelab's diagrams multiple times but am not understanding how the neutral wiring is done.

Thanks everybody for their help.
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Old 16th May 2009, 09:04 PM   #9
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This diagram shows how it should be wired.
Click the image to open in full size.
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Old 16th May 2009, 09:22 PM   #10
kerux is offline kerux  United States
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Default simple se c1 capacitor blew

Thank you nic6paul for the picture. I have seen that picture and I see the problem now.

http://www.magnequest.com/2a3_diy/Se..._Manual_v1.pdf

This document is for a different amp but shows wiring up a hammond 374bx which I have and shows how to wire up the 2 primaries wires and the neutral wiring.

Thanks
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