Adcom GFA-555 Feedback DC-Blocking Cap?

EchoWars · 9th July 2009, 03:56 PM

Got an original 555 on the bench, and was getting ready to replace the two small caps on the driver board. I noticed the feedback DC blocker is a 47µf 100V(!) cap. This is in a place where you'd expect to see a 6.3V or 10V cap, not 100V.

Is there a reasoning here that I'm missing?

infinia · 9th July 2009, 04:14 PM

Hi
Adcom probably already had that part on the parts list, so they used it instead, ie without adding another line item. Purchasing in quantity et al. I don't know its your call, but there is something to said about remaining in "stock" condition.

Nelson Pass · 9th July 2009, 08:31 PM

Just as likely it was on the prototype I gave them, and they
religiously used the same type.

EchoWars · 9th July 2009, 08:54 PM

Can't think for themselves?

I got no 47µf 100V caps here, but I have some 100µf 10V ones. Any reason I should not use them?

mlloyd1 · 9th July 2009, 09:14 PM

maybe higher voltage ratings implies lower leakage current?

mlloyd1

Nelson Pass · 9th July 2009, 11:25 PM

Naaaah.

Zen Mod · 9th July 2009, 11:39 PM

use 100uF/47V .......

EchoWars · 10th July 2009, 01:14 AM

Serbian humor?

Thanks anyway guys.

Zen Mod · 10th July 2009, 01:27 AM

Quote:

Originally posted by EchoWars
Serbian humor?

Thanks anyway guys.

Papa is Serb , too ?

EchoWars · 10th July 2009, 01:43 AM

I think you missed your calling.

9th July 2009, 04:14 PM	#2
infinia diyAudio Member Join Date: May 2005 Location: Californication	Re: Adcom GFA-555 Feedback DC-Blocking Cap? Hi Adcom probably already had that part on the parts list, so they used it instead, ie without adding another line item. Purchasing in quantity et al. I don't know its your call, but there is something to said about remaining in "stock" condition. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

9th July 2009, 11:39 PM	#7
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	use 100uF/47V ....... __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

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9th July 2009, 08:31 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	Just as likely it was on the prototype I gave them, and they religiously used the same type.

9th July 2009, 08:54 PM	#4
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	Can't think for themselves? I got no 47µf 100V caps here, but I have some 100µf 10V ones. Any reason I should not use them?

9th July 2009, 09:14 PM	#5
mlloyd1 diyAudio Member Join Date: Feb 2001 Location: illinois	maybe higher voltage ratings implies lower leakage current? mlloyd1

9th July 2009, 11:25 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	Naaaah.

10th July 2009, 01:14 AM	#8
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	Serbian humor? Thanks anyway guys.

10th July 2009, 01:43 AM	#10
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	I think you missed your calling.

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