Header bypass Cap?

toufu · 23rd June 2010, 04:54 PM

I built the Aikido Phono Preamp and it work out well for awhile, but then I cleaned up the board, changed tubes and some resistors. Now my heater bypass cap keeps exploding, can anybody think of a reason? Is it a bad tube or is there something shorting? See the user guide below, it's on page 5.

Thanks!

http://www.tubecad.com/2008/07/13/PH...o%20preamp.pdf

kevinkr · 23rd June 2010, 04:56 PM

Quote:

Originally Posted by toufu

I built the Aikido Phono Preamp and it work out well for awhile, but then I cleaned up the board, changed tubes and some resistors. Now my heater bypass cap keeps exploding, can anybody think of a reason? Is it a bad tube or is there something shorting? See the user guide below, it's on page 5.

Thanks!

http://www.tubecad.com/2008/07/13/PH...o%20preamp.pdf

C16 capacitor voltage rating too low? Installed backwards or filament wiring polarity swapped?

toufu · 23rd June 2010, 05:33 PM

I installed a 35V cap and my heater is running at 12.6V and I checked the polarity as well. It was working fine until I changed the cathod resistors and the tubes.

23rd June 2010, 04:54 PM	#1
toufu diyAudio Member Join Date: Jun 2008 Location: San Francisco	Header bypass Cap? I built the Aikido Phono Preamp and it work out well for awhile, but then I cleaned up the board, changed tubes and some resistors. Now my heater bypass cap keeps exploding, can anybody think of a reason? Is it a bad tube or is there something shorting? See the user guide below, it's on page 5. Thanks! http://www.tubecad.com/2008/07/13/PH...o%20preamp.pdf

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23rd June 2010, 05:33 PM	#3
toufu diyAudio Member Join Date: Jun 2008 Location: San Francisco	I installed a 35V cap and my heater is running at 12.6V and I checked the polarity as well. It was working fine until I changed the cathod resistors and the tubes.

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