Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

adcom 545 power suppy capcitors
adcom 545 power suppy capcitors
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 27th September 2006, 11:34 PM   #1
saramac is offline saramac  United States
diyAudio Member
Join Date: Nov 2004
Location: massachusetts
Default adcom 545 power suppy capcitors

Hello, I want to replace the 4 power supply caps on my adcom 545 ll. They are 63v 10,000uf 85c rubycon branded units, with three lugs and a (dummy lug) on the bottom of them. I can't seem to find anthing like this online. Can I substitue these with somthing else? I havent tried Adcom yet as they probabley charge an arm and leg for them. Any help appreciated. Thanks.
  Reply With Quote
Old 28th September 2006, 12:03 AM   #2
mrshow4u is offline mrshow4u  United States
diyAudio Member
mrshow4u's Avatar
Join Date: Jul 2006
See if Digi-Key has anything. <http://rocky.digikey.com/WebLib/Unit...20Data/SMH.pdf>

Newark, Allied, Mouser might have something too.
".........These go to eleven"
  Reply With Quote
Old 28th September 2006, 01:18 AM   #3
Leolabs is offline Leolabs  Malaysia
diyAudio Member
Leolabs's Avatar
Join Date: Dec 2004
Location: Bukit Mertajam
Send a message via MSN to Leolabs
You can replay with normal 2 legged caps.
  Reply With Quote
Old 28th September 2006, 01:23 AM   #4
KBK is offline KBK  Canada
diyAudio Member
Join Date: Dec 2003
Location: The Wilds Of Canada
you can likely go with a panasonic capacitor of similar design. Digikey has many great high current-high frequency-long foil 4 post panasonic caps. They are literally at the back of the electrolytic capacitor section of the cataloge. Digi-key has one of the best caps selections around.

I'd hazard a guess you could go to 15,000uf in the same space footprint wise, but go taller. Check how much space you have.

Also, if possible, do some changing out of the pre-driver power supply to better caps. The LXZ series of Rubycon caps are stellar performers,and come in at a maximum of 63VDC, perfect for you.

This is what I would personally do, and have just done to a Adcom 585.

-replace predriver main PS resevoir caps with slightly higher value uf values (2x, maybe) and LXZ Rubycon type.

-bypass the capacitor coupled input with higher grade polystyrene caps or similar, and an overall larger uf value. But not too high, ie, about 25% more uf total.

-remove all 'plug' connections, if any, by hardwiring the leads back into the boards, remove sockets.

-add some PS buffers directly at the leads for the output transistors. a 1000uf LXZ 63VDC cap at each should do it.

-up the fuse amerage ratings on the PS rails. If they are 5 amp, go to 7 amp fuses. Fuses there don't do squat anyway. the outputs blow, and then the fuses pop-after your drivers are blown. I've never had a different outcome, ever. If it was my unit, I'd likely go to 8 amp or 10 amp, but it's not my amp, it's yours.

-upgrade those main PS caps to the better high-current panasonic caps, from digikey.

-Use poly-prop bypass caps on the extra capacitance that is right at the transistors.

-Consider cleaning off the boards of the covering on the traces, and building up the thickness of them, in the PS parts of the traces. The adcom units tend to sound the same, having identical 'wet fart' note to any bass note, which is a indication of poor current delivery, no matter what their specs say. The traces are a shortcoming, but just one of them. Too light.

-Consider the use of ultra fast diodes in the circuit and/or ultrafast rectification.

Look at the grounding scheme that it employs, there may be room for improvement.

I'm sure there is more, but I'll let others chime in, if so inclined.
"Extraordinary claims require extraordinary evidence." - Carl Sagan. Sometimes the claims aren't extraordinary. Sometimes the weakness of men's minds are the culprit. Mass mentality has nothing to do with obviousness or truths.
  Reply With Quote
Old 1st February 2012, 01:20 PM   #5
tloftis is offline tloftis
diyAudio Member
Join Date: Feb 2012
my 555 needs to be overhauled and I have a few questions you might be able to help with. Please see image attached. I am not sure of what parts are what. Maybe you can help identify them and I can replace them.
Attached Images
File Type: jpg adcomimage.jpg (476.6 KB, 77 views)
  Reply With Quote


adcom 545 power suppy capcitorsHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Adcom GFA 535 Clicking on Power Up and Down YammerBoy Solid State 1 14th June 2009 10:12 PM
Black Gate vs Siemens (Epcos) MKV for HT suppy of SET amp (Filter) DHTGUY Parts 0 12th December 2008 07:54 PM
xbox power suppy dead guitar_joe Power Supplies 3 2nd July 2008 04:03 AM
Solid state power suppy for CAT SL-1 pwan Tubes / Valves 0 7th January 2008 02:57 PM
krell kas power suppy hum minh_827 Solid State 10 16th September 2005 01:44 PM

New To Site? Need Help?

All times are GMT. The time now is 02:25 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio