dtotheatothevtothee Posted February 5, 2011 Report Share Posted February 5, 2011 I was wondering if someone had a listing of all the capacitor values for a pair of AR-90s. I'm looking to see how much it would cost to replace all the caps, but I'm not very good at reading schematics. I have someone to rebuild the speaker if I supply the parts. Link to comment Share on other sites More sharing options...
rrcrain Posted February 7, 2011 Report Share Posted February 7, 2011 I was wondering if someone had a listing of all the capacitor values for a pair of AR-90s. I'm looking to see how much it would cost to replace all the caps, but I'm not very good at reading schematics. I have someone to rebuild the speaker if I supply the parts.There's an excellent set of schematics in the Library section of this web page along with a few other interesting articles regarding this speaker. You will be amazed at the difference a new set of caps will make. Link to comment Share on other sites More sharing options...
ar90fan Posted February 7, 2011 Report Share Posted February 7, 2011 Take note of the list for each speaker:1 350 uF1 80 uF 1 30 uF1 40 uF1 8 uF1 24 uF1 4 uF1 6 uFFor your info, I carried replacement out in the year 2000 with Solen metalized 400 V polypropilyne capacitors, and the investment was worth it. Go for it. Link to comment Share on other sites More sharing options...
dtotheatothevtothee Posted February 8, 2011 Author Report Share Posted February 8, 2011 Sweet thanks for the list...couple of questions though...If they don't offer a 350uF can I get a 200uF and a 150uF and tie them together. Are these caps going to be larger size-wise than the factory ones?I don't know how much of an improvement I will notice as I haven't listened to the speakers in 10+ years and not with a good amp in over 15 years. I'm sure they will sound a million times better than my Bose SoundDock, VAF Octavio and iPod headphones I've been stuck using the last several years!! Especially sine I'll have a turntable hooked up to them. Haha. Link to comment Share on other sites More sharing options...
michiganpat Posted February 8, 2011 Report Share Posted February 8, 2011 FWIW, I would use non-polar electrolytics for anything bigger than 25-30uf..I'd be shocked if you noticed a difference with the large poly vs. NPE caps, and it'll save a lot of coin. Link to comment Share on other sites More sharing options...
deek Posted February 8, 2011 Report Share Posted February 8, 2011 ...If they don't offer a 350uF can I get a 200uF and a 150uF and tie them together... Haha.Yes, you may Parallel multiple capacitors to achieve a sum value. (Wire them in parallel, NOT series) The voltage rating on the capacitor with the smallest capacitance is the circuit's effective voltage rating.(Half way down this page... http://www.aikenamps.com/AddingComponents.htm)-deek Link to comment Share on other sites More sharing options...
rrcrain Posted February 9, 2011 Report Share Posted February 9, 2011 Yes, you may Parallel multiple capacitors to achieve a sum value. (Wire them in parallel, NOT series) The voltage rating on the capacitor with the smallest capacitance is the circuit's effective voltage rating.(Half way down this page... http://www.aikenamps.com/AddingComponents.htm)-deekThe poly caps will last longer and tend to have a steeper (faster) RC time constant. Link to comment Share on other sites More sharing options...
deek Posted February 9, 2011 Report Share Posted February 9, 2011 The poly caps will last longer and tend to have a steeper (faster) RC time constant.That's a great point. You should not mix cap types when combining to achieve a blended value. I'm not sure there would be any audible affect but it could mess with phasing at the highest frequencies.There is a formula for calculating the effective time constraint of a blended circuit like that but it's been years since I've used it...-deek Link to comment Share on other sites More sharing options...
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