Placing capacitor close to a power transformer

trondareo · 2nd September 2010, 05:55 PM

I am building a rather unorthodox chassis for this tube amplifier http://www.audiohobbyist.com/images/832/832sch.jpg, where the easiest mechanical option is to place the 820uF capacitor about one cm from the corner of the power transformer. It seems like inviting trouble as this is where the flux is strongest. However I see plenty of amps where the capacitor is close to the transformers, mounted horizontally just below a aluminum plate.

Can anybody with more wisdom in these matter than me, help to cast light over the issue? (means every body)

trondareo · 2nd September 2010, 06:41 PM

And here is the picture:

DF96 · 2nd September 2010, 07:02 PM

Heat is the main issue. Electrolytics need to be kept cool. Power transformers get hot after a while. As hot air rises, putting the capacitors under the transformer may be sensible as long as there is not a lot of heat conducted through the chassis too.

trondareo · 2nd September 2010, 07:44 PM

So, I could mount it horizontally, with ventilation holes underneath, and maybe a polished aluminum heat shield.

However the issue of electromagnetic interference is still there, since its close to the trannie

2nd September 2010, 05:55 PM	#1
trondareo diyAudio Member Join Date: Feb 2009 Location: Trondheim	Placing capacitor close to a power transformer I am building a rather unorthodox chassis for this tube amplifier http://www.audiohobbyist.com/images/832/832sch.jpg, where the easiest mechanical option is to place the 820uF capacitor about one cm from the corner of the power transformer. It seems like inviting trouble as this is where the flux is strongest. However I see plenty of amps where the capacitor is close to the transformers, mounted horizontally just below a aluminum plate. Can anybody with more wisdom in these matter than me, help to cast light over the issue? (means every body)

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2nd September 2010, 06:41 PM	#2
trondareo diyAudio Member Join Date: Feb 2009 Location: Trondheim	And here is the picture:

2nd September 2010, 07:02 PM	#3
DF96 diyAudio Member Join Date: May 2007	Heat is the main issue. Electrolytics need to be kept cool. Power transformers get hot after a while. As hot air rises, putting the capacitors under the transformer may be sensible as long as there is not a lot of heat conducted through the chassis too.

2nd September 2010, 07:44 PM	#4
trondareo diyAudio Member Join Date: Feb 2009 Location: Trondheim	So, I could mount it horizontally, with ventilation holes underneath, and maybe a polished aluminum heat shield. However the issue of electromagnetic interference is still there, since its close to the trannie

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