Adcom 565 amplifier HELP

montfriz · 23rd August 2005, 07:21 PM

Looking for 2 capacitors for this amp,spoke with Adcom they no longer have these parts.(Great Service) The Caps are 100 volts-125 surge and 35,000 microfareds.I've called all over Canada and the USA with no luck, ANY HELP will be fantastic... Thanks in advance..

googler · 23rd August 2005, 07:45 PM

Found forum topic on exact same issue on another site. Here they suggest moving up to a 39,000uf 100V (125v surge) cap from mouser which is no longer stocked.

http://www.stevehoffman.tv/forums/sh...t=38831&page=2

You can probably get away comfortably with a 75V cap and still have plenty of headroom for mains surges. Mouser has a Vishay/Sprague cap here

~Brad

anatech · 23rd August 2005, 08:53 PM

Hi Brad,
No. The breakdown voltage is important. The difference is too great here.

Hi montfriz,
How old did you say that amp is? Of course they don't have stock. The replacements would be as old as the amp as the parts are bought at the same time. However, you can find something the same approximate size physically and the same voltage and install those The actual capacitance is not that important given the tolerances. You may need to change to some PC mount parts but there is always a way.

-Chris

K-amps · 23rd August 2005, 08:59 PM

Montfritz,

I have new and unused Adcom power caps they use in the 300w/pch GFA-5802. The 565 is also 300w/pch so they should work. They are the same width but slightly short so they will drop just right in the current slots... that is if you can settle with the being 22000uf 100v .

That being said, I have 2-3 565's lying around and I can take out the big caps you want and put the 22000uF's for my use... how much would the 35000uF/100v be worth to you? I am just seeing if they are worth my time to sell them to you and go with the 22000uF (which by the way Adcom sells for $62.5 each )

googler · 23rd August 2005, 09:49 PM

Quote:

Originally posted by anatech
Hi Brad,
No. The breakdown voltage is important. The difference is too great here.

Hi Chris,

Whats the voltage on the secondaries? It was my understanding that they were under 40V... If it is higher than that then please disregard my 75v cap suggestion.

~Brad

anatech · 23rd August 2005, 10:01 PM

Hi Brad,
I think they are on the order of 75~80 volts (from memory). 40V gives you a 50W ish amp.
Anyhow, it's never a good idea to go lower in voltage. They went as low as they safely could at the manufacturing level.

-Chris

K-amps · 23rd August 2005, 10:12 PM

The rails on the 565 are around 82-84vdc per rail depending on Mains AC.

Chris... Can I use a 100v cap (125v surge) on 100v rails? i.e. will the surge rating take care of the 20% margin that you need to have typically? Please note: It is Very hard to get caps over 100v ratings incrementally... you need to go to 160v or 200v both which are either too big or less capacitance.

anatech · 23rd August 2005, 11:58 PM

Hi Arif,
I am not comfortable with that. What if your average hydro voltage is boosted in a couple years? The life on the caps would be shortened for sure. How about some 65V units in series? I know, I would try to get around that as well but if it's the only way. Or find another brand using special order 125V caps and buy tho$e. 160V is not too bad except for the exponential pricing.

-Chris

K-amps · 24th August 2005, 12:27 AM

Plus I have many 100v types that are drop in.... Lets see

montfriz · 25th August 2005, 06:01 AM

Brad and Chris:

Thanks for the help ,contacted Tim on the other forum he gave me info on JEA Capacitors in New York phone #800-645-2666 they have the caps in stock and 2 are on the way to me in Cape Breton. They sell for $ 68.40 a can and are new.

Thanks again, Harold

23rd August 2005, 07:21 PM	#1
montfriz diyAudio Member Join Date: Nov 2004 Location: St. Anns	Adcom 565 amplifier HELP Looking for 2 capacitors for this amp,spoke with Adcom they no longer have these parts.(Great Service) The Caps are 100 volts-125 surge and 35,000 microfareds.I've called all over Canada and the USA with no luck, ANY HELP will be fantastic... Thanks in advance..

25th August 2005, 06:01 AM	#10
montfriz diyAudio Member Join Date: Nov 2004 Location: St. Anns	Adcom problem solved Brad and Chris: Thanks for the help ,contacted Tim on the other forum he gave me info on JEA Capacitors in New York phone #800-645-2666 they have the caps in stock and 2 are on the way to me in Cape Breton. They sell for $ 68.40 a can and are new. Thanks again, Harold

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23rd August 2005, 07:45 PM	#2
googler diyAudio Member Join Date: Feb 2005 Location: Illinois	Found forum topic on exact same issue on another site. Here they suggest moving up to a 39,000uf 100V (125v surge) cap from mouser which is no longer stocked. http://www.stevehoffman.tv/forums/sh...t=38831&page=2 You can probably get away comfortably with a 75V cap and still have plenty of headroom for mains surges. Mouser has a Vishay/Sprague cap here ~Brad

23rd August 2005, 08:53 PM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Brad, No. The breakdown voltage is important. The difference is too great here. Hi montfriz, How old did you say that amp is? Of course they don't have stock. The replacements would be as old as the amp as the parts are bought at the same time. However, you can find something the same approximate size physically and the same voltage and install those The actual capacitance is not that important given the tolerances. You may need to change to some PC mount parts but there is always a way. -Chris

23rd August 2005, 08:59 PM	#4
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	Montfritz, I have new and unused Adcom power caps they use in the 300w/pch GFA-5802. The 565 is also 300w/pch so they should work. They are the same width but slightly short so they will drop just right in the current slots... that is if you can settle with the being 22000uf 100v . That being said, I have 2-3 565's lying around and I can take out the big caps you want and put the 22000uF's for my use... how much would the 35000uF/100v be worth to you? I am just seeing if they are worth my time to sell them to you and go with the 22000uF (which by the way Adcom sells for $62.5 each )

23rd August 2005, 10:01 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Brad, I think they are on the order of 75~80 volts (from memory). 40V gives you a 50W ish amp. Anyhow, it's never a good idea to go lower in voltage. They went as low as they safely could at the manufacturing level. -Chris

23rd August 2005, 10:12 PM	#7
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	The rails on the 565 are around 82-84vdc per rail depending on Mains AC. Chris... Can I use a 100v cap (125v surge) on 100v rails? i.e. will the surge rating take care of the 20% margin that you need to have typically? Please note: It is Very hard to get caps over 100v ratings incrementally... you need to go to 160v or 200v both which are either too big or less capacitance.

23rd August 2005, 11:58 PM	#8
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Arif, I am not comfortable with that. What if your average hydro voltage is boosted in a couple years? The life on the caps would be shortened for sure. How about some 65V units in series? I know, I would try to get around that as well but if it's the only way. Or find another brand using special order 125V caps and buy tho$e. 160V is not too bad except for the exponential pricing. -Chris

24th August 2005, 12:27 AM	#9
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	Plus I have many 100v types that are drop in.... Lets see

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