RussianPIO caps picking up hum

regal · 12th June 2011, 02:32 PM

On a couple builds now I have found that the nice russian PIO type caps seem to be susibtile to picking up a low pitched hum around SS devices like mofsets/jfets. I'll notice this after upgrading from a generic plyester box cap to a iuf KY40 or K75. Has anyone else noticed this issue?

Would it be from cramming the much larger cap in a box cap space with the lead exposed? On the first buid I grounded the cases and that seemed to take care of it.

Has anyone else noticed this phenomenom?

mace1337 · 12th June 2011, 02:43 PM

Yes I have experienced this as well. Not as specific as your case. (i.e. I hadn't linked it to proximity to SS devices)

I believe the cases are magnetic so it may be an inductive effect. Grounding the cases indeed works.

regal · 12th June 2011, 02:57 PM

Quote:

Originally Posted by mace1337

Yes I have experienced this as well. Not as specific as your case. (i.e. I hadn't linked it to proximity to SS devices)

I believe the cases are magnetic so it may be an inductive effect. Grounding the cases indeed works.

Now that makes sense, probably radioactive too

Off to ground some caps.

Thanks

alexberg · 12th June 2011, 03:37 PM

Quote:

Originally Posted by regal

Now that makes sense, probably radioactive too :cool

Have you purchased them in Japan?

12th June 2011, 02:32 PM	#1
regal diyAudio Member Join Date: Jan 2004 Location: MD	RussianPIO caps picking up hum On a couple builds now I have found that the nice russian PIO type caps seem to be susibtile to picking up a low pitched hum around SS devices like mofsets/jfets. I'll notice this after upgrading from a generic plyester box cap to a iuf KY40 or K75. Has anyone else noticed this issue? Would it be from cramming the much larger cap in a box cap space with the lead exposed? On the first buid I grounded the cases and that seemed to take care of it. Has anyone else noticed this phenomenom?

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12th June 2011, 02:43 PM	#2
mace1337 diyAudio Member Join Date: Aug 2005	Yes I have experienced this as well. Not as specific as your case. (i.e. I hadn't linked it to proximity to SS devices) I believe the cases are magnetic so it may be an inductive effect. Grounding the cases indeed works.

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