Thrift store find.. Original Advents dated 1975 doing surrounds, what about Caps?

Discussion in 'Speakers' started by Darren James, May 11, 2018.

  1. Darren James

    Darren James Active Member

    Messages:
    111
    K, I have them open and I ordered the surrounds...
    While I have them open, .............
    Should I just go ahead and do the caps????
     

     

    Please register to disable this ad.

  2. Beemerdoc

    Beemerdoc Grumpy Old Fart Subscriber

    Messages:
    502
    Location:
    Sarasota, Florida
    It can't hurt. You have everything to gain, and nothing to lose.
     
    gdmoore28 likes this.
  3. Donkey Karma

    Donkey Karma AK Subscriber Subscriber

    Messages:
    1,301
    Having recapped piles of speakers over the years, I am not one to always claim a "night and day" difference once it's done. With that said the OLA's and the EPI's I have recapped (original caps still in spec or not) I heard a significant improvement to my ears.

    IMHO low risk and well worth the small investment.
     
  4. kermit z

    kermit z Loud Music saves Lives!! Subscriber

    Messages:
    9,468
    Location:
    Denver CO
    Yup, do it. There will be improvement. How much, is up to your ears.
     
  5. crazy-in-az

    crazy-in-az All humans are vermin... Subscriber

    Messages:
    2,877
    Location:
    Kingman, Arizona
    Replacing capacitors is fairly cheap insurance. As others have stated, you may not hear much of a difference but the old caps are usually out of spec by now.

    What I like to do when recapping is do one speaker at a time and compare the recapped speaker to the un-recapped speaker. Usually you can hear the differences, even slight ones when doing a side buy side comparison.
     
  6. Darren James

    Darren James Active Member

    Messages:
    111
    So I do the Surrounds, put them in, and "BAM", no tweeter works..... on either of them..... Glad I only paid $6.99 for the pair.. So I am in search of a good pair of fried egg.... Trouble is, these came with the green ones... made in 1975 I guess

    [​IMG]
     

     

    Please register to disable this ad.

  7. Fairlane

    Fairlane AK Subscriber Subscriber

    Messages:
    1,703
    Location:
    West San Jose CA
    Have you put a meter on the tweeters to see if they are indeed open?
     
  8. N8Nagel

    N8Nagel Addicted Member

    Messages:
    6,625
    Location:
    Sterling, VA
    if those have those little black "temple" caps, it might be worth following Fairlane's advice, or simply drop a very low level audio signal direct on the tweeters to see if the issue is the tweeters or the x-over caps.

    I've never had them go completely dead, but I have had speakers sound really rolled off due to those old caps presumably having very high ESR.
     
  9. Darren James

    Darren James Active Member

    Messages:
    111
    Thank you all for the help. Unfortunately I have connected directly to both with nothing. Low volume sound, OHM reading, just nothing...

    [​IMG]
     
  10. quiet

    quiet AK Subscriber Subscriber

    Messages:
    1,465
    Location:
    arkansas
    I have OLA Advent also. Mine sound just like everyone say they do. Except the tweeters are week. I assume the caps are failing or the tweeters are stiff from age. I will recap them.
    I don't assume that used replacement tweeters are going to be any less stiff. I hope you can get good tweeters that aren't stiff. And how would you know?
    I'm going to consider new options.
     
  11. Darren James

    Darren James Active Member

    Messages:
    111
    I ordered new caps. They just came in. I found a set of tweeters I like on Ebay, $30ea. So, hopefully this weekend I'll do the work.
    I have never heard these.
    I have a pair of Marantz Imperial 6 two ways from 1975, and they are very sweet. Probably the flattest I have ever heard... Just a pleasure to listen to...
    I am looking forward to these.
    I also just grabbed a pair of JBL L36's which someone had thrown a pair of JBL subwoofers off the shelf in to them.... shame! They didn't have the original ones
    so I am on the lookout for some 125A woofers from that period...

    Oh the life of a audio addict!! LOL
     
    GD70 likes this.

     

    Please register to disable this ad.

  12. quiet

    quiet AK Subscriber Subscriber

    Messages:
    1,465
    Location:
    arkansas
    The OLA is an interesting speaker. Some say they were a standard to be judged by. I say they sound good in a small box for a price. If I heard a brand new pair I might say something else. I want to hear one with a cross change and new fancy tweeter that can go down to meet that woofer. I want to hear some sparkle to go with that bottom boom.
    Love the look, the build ,the history..................
    Mine do sound good as is, old tweeter and all. I don't think flat is part of the deal on these. There's no denying they justify their in use existence and place in history.
     
  13. E-Stat

    E-Stat AK Subscriber Subscriber

    Messages:
    5,836
    Well, they were certainly good by 1972 standards. A friend reviewed them as doubles in the first issue of The Absolute Sound.

    The New Advent introduced in 1979 made a number of changes to improve the sound quality. Among them:

    -Ferrofluid cooled tweeter for enhanced power handling (Harry smoked a few of the originals driving them with a Phase Linear 700)
    -Closer mounting of woofer and tweeter for more consistent directivity
    -Moved crossover from 1 kHz to 1.5 kHz for better driver blending (as you noted, the tweeter struggled to reach the bottom of the original's range)
    -Simplified crossover using fewer components
    -Tonal balance change where "Normal" was previously "Extended"
    -Simplified metal basket for woofer

    I've made a couple of enhancements to my pair of New Advents. Replaced original electrolytics in xover with mix of 'lytic and film for improved transparency and added felt damping around tweeter to minimize diffraction.

    As for range, I would classify them as a nine octave speaker - losing a half at either extreme. The tweeter was never known for its top end response. Other designs of that era like the Braun/ADS were superior. My first pair of Advents was purchased in '72. I moved to Braun LV1020s in '74. Purchased used New Advents for the garage about fifteen years ago.
     
    quiet likes this.
  14. DAA

    DAA Active Member

    Messages:
    107
    I’m among the fans of OLAs. I restored a minty pair of walnut Advents about 8 years ago and they have been in use since. Do make sure woofer surround is proper size. I recommend using Dayton poly caps in crossover. I have 1974 vintage speakers and swapped to a 8/16 cap set up. Sounds wonderful on extended. I also replaced fiberglass with new and soldered all the leads internally. I dampened the woofer basket with thin rubber material. Lastly, I added a front to back 1” brace between the drivers. I would get them up approx 6” off the floor and very slightly tilt them back. I like them 12” from the wall in my room. I also tend to toe in the left speaker a tad more than right for improved imaging. People can say what they want, but I’ve burned through prob 20 pairs of speakers and always return to these. Love them!
     
    Fairlane likes this.
  15. ryeno

    ryeno New Member

    Messages:
    8
    What type of caps do you use and where do I buy them? I am considering recapping my EPI speakers.
     
  16. Donkey Karma

    Donkey Karma AK Subscriber Subscriber

    Messages:
    1,301
    Dayton 1%ers
     
    ryeno and GD70 like this.

     

    Please register to disable this ad.

  17. Darren James

    Darren James Active Member

    Messages:
    111
    I got the caps..... Dayton... http://www.parts-express.com .... Waiting on the replacement tweeters from Ebay...
    Woofers are done. Gonna do the caps tonight.....
    Thank you everyone for help
     
  18. quiet

    quiet AK Subscriber Subscriber

    Messages:
    1,465
    Location:
    arkansas
    I see your moving right along. Are you going to show use the tweeters when you get them?
     
  19. E-Stat

    E-Stat AK Subscriber Subscriber

    Messages:
    5,836
    Did you order electrolytic or film types. Film is better, but since the ESR (effective series resistance) is lower, the result will be brighter sounding than the originals unless you add resistance.

    I initially replaced the 13uF electrolytic in my New Advents with a 12 and 1 uF film. The result was intolerably bright.

    I ended up using the 1uF film with a 12 uF ‘lytic which improved resolution and maintained tonal balance. In a perfect world, I would have rebuilt the xover using only film and appropriate resistor value.
     
  20. MannyE

    MannyE Exterminate! Subscriber

    Messages:
    4,863
    Location:
    Miami Beach
    The way I see it, if you have it open and it's not a PITA then why not do it just to not have to do it later if they suddenly fail after years of sitting idle and then being used all the time? you may not hear an improvement, but you won't have to worry about caps failing and ruining anything. Plus if you hear a weak tweeter, at least you know it's not the caps. While you are in there, test any resistors as well to make sure they are still within spec.

    Good luck! Seems you are well on your way to getting these back in action.
     

Share This Page