cornholio Posted June 8, 2010 Share Posted June 8, 2010 Hi, first of all thanks for the advice to keep the finish raw on my Decorator Cornwalls. Today I opened them up to have a look at the crossovers, expecting to find some old leaky worn out looking caps. But much to my suprise the caps were the old metal kind ,but look shiny and new, with no leaking. I bought these corns from the second owner, who thought they had never been recapped, but they just look so shiny compared to most of the pics I have seen of old Klipsch crossovers. The Brand is "Aerovox" Can anyone give an idea of how old they are and if i should still look into recapping anyway? Thanks in advance for any help Quote Link to comment Share on other sites More sharing options...
Marvel Posted June 8, 2010 Share Posted June 8, 2010 They are the original caps, so the serial number of the Corns would tell you their age.They always look nice when they are inside the cabinets like that. You can date themwith the attached. Bruce klipsch_SN_format.pdf Quote Link to comment Share on other sites More sharing options...
CapZark Posted June 8, 2010 Share Posted June 8, 2010 I replaced the same type in my Herseys with Crites caps and I can't hear any difference at all. My Herseys are 1979 models. Quote Link to comment Share on other sites More sharing options...
Guest David H Posted June 8, 2010 Share Posted June 8, 2010 I replaced the same type in my Herseys with Crites caps and I can't hear any difference at all. The caps in you Heresy's may have been good, hard to say without testing them. I heard or I atleast think I heard a signifigant improvment when I replaced my original caps in my Cornwalls with Sonicaps from Bob. Dave Quote Link to comment Share on other sites More sharing options...
JJkizak Posted June 8, 2010 Share Posted June 8, 2010 Remember that when you replace caps that Klipsch wrote on them with grease pencil the actual capacitance measured which usually was not what the can stated from the manufacturer. JJK Quote Link to comment Share on other sites More sharing options...
CapZark Posted June 9, 2010 Share Posted June 9, 2010 Yes, they might have been good. Who knows? I'm still happy to have the new caps anyway. By the way, I put new Crites crossovers in my La Scalas and they sound awesome. I'm sure thay are not ALK good?, but the price was right and they are good enough for me. Quote Link to comment Share on other sites More sharing options...
spfl Posted June 9, 2010 Share Posted June 9, 2010 I had the same caps in my Cornwalls and put off changing them out for Sonicaps because the speakers sounded good to my ears. When I finally put in new caps the sound was much improved; the result was a much more balanced sound and I'm sorry I didn't make the change sooner. The only downside for me was that tube rolling in my amp no longer has a big effect on the sound. Quote Link to comment Share on other sites More sharing options...
Bonobo Posted June 9, 2010 Share Posted June 9, 2010 My is 78 , and just recap ....Sweet http://img811.imageshack.us/img811/7124/p6020034.jpg http://img809.imageshack.us/img809 All are aluminum metalized for Mid range , the one other for Tweter I use Poly metalized Quote Link to comment Share on other sites More sharing options...
seti Posted June 10, 2010 Share Posted June 10, 2010 The old crossovers that look like hell are the ones that have been exposed to the elements like the open back of Belle La Scala and khorn. I've opened up old Heresy only to see beautifully preserved crossovers. Do this affect longevity? It makes me less likely to want to remove them. Quote Link to comment Share on other sites More sharing options...
cornholio Posted June 10, 2010 Author Share Posted June 10, 2010 Thank you for all the help. These crossovers are from 78 cornwalls, and after finding out here they were original caps I took them to Vancouver Speaker Clinic expecting to need a recap job. They tested the crossovers and said they are still working properly. Quote Link to comment Share on other sites More sharing options...
seti Posted June 11, 2010 Share Posted June 11, 2010 Thank you for all the help. These crossovers are from 78 cornwalls, and after finding out here they were original caps I took them to Vancouver Speaker Clinic expecting to need a recap job. They tested the crossovers and said they are still working properly. That is cool. Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted June 11, 2010 Share Posted June 11, 2010 The caps Klipsch used at that time are paper in oil. This have a lot of loss even when brand new (Q=200 or so). Sonicaps will show far less loss by at lease a factor a 5 (Q=1000). This will let more energy through to the tweeter giving you a crisper sound. With the old caps the loss will be even greater and the change even more dramatic. Al K. Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted June 11, 2010 Share Posted June 11, 2010 Bob Crites emailed me a picture of that type cap with its insides out! It isn't a paper cap. It's hard to tell what it is from the picture. He claims they have an ESR of about 1 Ohm. If it's 4 uF at 1 Khz, that only a Q of 40! That's VERY poor! Q = 1 / (2 * pi * F * C) / ESR = 1 / (6.28 * 1000 * 4e-6) / 1 = 40 A 3.0 uF Sonicap I happened to have measures 2.997 uF D=.00033. That is Q = roughly 3000. ESE=.017 Ohm Q = 1/ (2 * pi * 1000 * 3e-6) / .017 = 3120 BTW: The ESR and Q will be worse at 6000 Hz than it is at 1000 Hz. Al K. . Quote Link to comment Share on other sites More sharing options...
BEC Posted June 11, 2010 Share Posted June 11, 2010 Here is the picture I sent to Al. This is an Aerovox 4uF cap from a 1974 Cornwall. Bob Crites Quote Link to comment Share on other sites More sharing options...
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