Results 1 to 11 of 11

Thread: Restoring JBL Paragon

  1. #1
    Junior Member murdoch's Avatar
    Join Date
    Feb 2008
    Location
    Manila, the Philippines
    Posts
    9

    Restoring JBL Paragon

    Hello all, I am thinking of restoring my dad's paragon and I need advise on what to do to have the drivers and the dividing networks restored.

    I have fired it up and the 375's seem to be spot on but the right side 075 ring radiator seems weak and had been intermittently cutting off.

    I also want to have the dividing network components checked.

    Will someone be kind enough to direct me to people who are truly knowledgeable in this kind of restoration? Also perhaps to help me how to do the restoration in general via email as I live in in southeast Asia.

    Eventually, I will need help to source the correct size and type of wires needed to replace the old ones too.

    This is also very sentimental to me as this is how I have bonded with my dad. It brings wonderful and poignant memories of our times listening to music together and I must confess that I love it dearly. Both the memories and these speakers which bring it all to life again. Paragons, being the heirlooms that they are would be one that I will pass on to my only son too.

    Thank you all and I do hope that help will come.

  2. #2
    Senior Member BMWCCA's Avatar
    Join Date
    Feb 2006
    Location
    Virginia
    Posts
    6,964
    Quote Originally Posted by murdoch View Post
    I have fired it up and the 375's seem to be spot on but the right side 075 ring radiator seems weak and had been intermittently cutting off.
    I would check the rotary control (L-pad) on the N7000 crossover. It's likely the source of your intermittent behavior on the 075. The simplest first step is to rotate the control from one extreme to the next several (many) times with the system off (or volume turned down) to see if that's enough to clean the contacts. If that works, you're good to go. Otherwise the N7000 is actually a very simple network and there are many threads here about replacing caps as well as cleaning the L-pad.
    ". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers

  3. #3
    Senior Member audiomagnate's Avatar
    Join Date
    Jan 2011
    Location
    Colorado and Georgia
    Posts
    1,014
    Quote Originally Posted by BMWCCA View Post
    I would check the rotary control (L-pad) on the N7000 crossover. It's likely the source of your intermittent behavior on the 075. The simplest first step is to rotate the control from one extreme to the next several (many) times with the system off (or volume turned down) to see if that's enough to clean the contacts. If that works, you're good to go. Otherwise the N7000 is actually a very simple network and there are many threads here about replacing caps as well as cleaning the L-pad.
    I'm friends with an ex-Harman employee who is also a hell of a tech, and he told me the caps in those crossovers should last a very long time. It sounds like you have, except for a dirty pot, a fully functioning Paragon. The tweeter pots do sometimes go bad - I've seen one that literally fell apart - but the old trick suggested above may be all you need. If you want to do it right get some Deoxit and Fader Lube. Like my dad used to say, if it ain't broke, don't fix it!

  4. #4
    Senior Member SEAWOLF97's Avatar
    Join Date
    Jan 2006
    Location
    PDX, ®egon
    Posts
    9,102
    Quote Originally Posted by audiomagnate View Post
    Like my dad used to say, if it ain't broke, don't fix it!
    Like we used to say at Intel , if it ain't broke, fix it 'till it is .....
    “If you think that’s the dumbest thing you’ve ever heard,
    just wait a couple minutes!”

  5. #5
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,981
    I agree with the previous posters that the likely culprit on the 075 is your L-pad. If your Paragons have LE15A woofers, I would pull your woofers though and inspect the surrounds. It is very likely they have the old Lans-a-loy material which gets very stiff over time. Replacing these surrounds with modern foam will improve the bass significantly.

    It is possible that your Paragon has the 150-4C woofers... if they are installed, then you are good to go. That said, these are very rare. It is much more likely that you have the LE15A woofers.


    Widget

  6. #6
    Junior Member murdoch's Avatar
    Join Date
    Feb 2008
    Location
    Manila, the Philippines
    Posts
    9
    Quote Originally Posted by BMWCCA View Post
    I would check the rotary control (L-pad) on the N7000 crossover. It's likely the source of your intermittent behavior on the 075. The simplest first step is to rotate the control from one extreme to the next several (many) times with the system off (or volume turned down) to see if that's enough to clean the contacts. If that works, you're good to go. Otherwise the N7000 is actually a very simple network and there are many threads here about replacing caps as well as cleaning the L-pad.
    Thank you sir for that quick tip. I'll try to do all the generous and sound advise you have given me over the weekend. I think you are right about the caps and I hope that's just it. I can't wait to do a thorough check on it. Again, my thanks.

    I see your name as BMWCCA, I surmise you are a BMW enthusiast? Great marque.

  7. #7
    Junior Member murdoch's Avatar
    Join Date
    Feb 2008
    Location
    Manila, the Philippines
    Posts
    9
    Quote Originally Posted by Mr. Widget View Post
    I agree with the previous posters that the likely culprit on the 075 is your L-pad. If your Paragons have LE15A woofers, I would pull your woofers though and inspect the surrounds. It is very likely they have the old Lans-a-loy material which gets very stiff over time. Replacing these surrounds with modern foam will improve the bass significantly.

    It is possible that your Paragon has the 150-4C woofers... if they are installed, then you are good to go. That said, these are very rare. It is much more likely that you have the LE15A woofers.


    Widget
    Thank you very much Mr. Widget. I'll have to check if I have the LE15-A or 150-4C woofers on it. But if my memory serves me right, the Paragon being a circa 1969 model, might have 150-4C's. I'll let you know for further advise. Thanks again sir.

  8. #8
    Junior Member murdoch's Avatar
    Join Date
    Feb 2008
    Location
    Manila, the Philippines
    Posts
    9
    Quote Originally Posted by audiomagnate View Post
    I'm friends with an ex-Harman employee who is also a hell of a tech, and he told me the caps in those crossovers should last a very long time. It sounds like you have, except for a dirty pot, a fully functioning Paragon. The tweeter pots do sometimes go bad - I've seen one that literally fell apart - but the old trick suggested above may be all you need. If you want to do it right get some Deoxit and Fader Lube. Like my dad used to say, if it ain't broke, don't fix it!

    Keeping my fingers crossed that it will be just dirty caps. It's been 5 years since I last fired it. Couldn't get myself to really get into it as I intended to restore it ground up and that is a big project. I just want to be sure that it's checked well before I do.

    Thanks very much Mr. Audiomagnate and i'll give you fine gents an update and some pics next time.

  9. #9
    Junior Member murdoch's Avatar
    Join Date
    Feb 2008
    Location
    Manila, the Philippines
    Posts
    9
    Quote Originally Posted by SEAWOLF97 View Post
    Like we used to say at Intel , if it ain't broke, fix it 'till it is .....

    Thanks Seawolf. I agree but I don't think that goes with the interconnect wires between the drivers and the networks. The wires are at least 45 years old . I decided to use some newer wires for temporary use until I get advise about the right size, type and brand wires that I may be able to pick up from here.

    Till then, wish me luck sir.

  10. #10
    Senior Member audiomagnate's Avatar
    Join Date
    Jan 2011
    Location
    Colorado and Georgia
    Posts
    1,014
    Quote Originally Posted by murdoch View Post
    Keeping my fingers crossed that it will be just dirty caps. It's been 5 years since I last fired it. Couldn't get myself to really get into it as I intended to restore it ground up and that is a big project. I just want to be sure that it's checked well before I do.

    Thanks very much Mr. Audiomagnate and i'll give you fine gents an update and some pics next time.
    Dirty potentiometers (L Pads), NOT dirty caps. The caps may be fine.

    Quote Originally Posted by murdoch View Post
    Thanks Seawolf. I agree but I don't think that goes with the interconnect wires between the drivers and the networks. The wires are at least 45 years old . I decided to use some newer wires for temporary use until I get advise about the right size, type and brand wires that I may be able to pick up from here.

    Till then, wish me luck sir.
    Wire really doesn't go bad. If the insulation rots then it should be replaced, but if it's intact, KEEP IT ORIGINAL. Collectors prefer these things in original condition. The fact that yours seems to be very close to original WORKING condition is a big plus. I hope you saved the old wire, but if you didn't, generic 16 awg color coded speaker hookup wire will do fine. I know you're not in the US, but here is what I use, unless someone wants to pay extra for "magic" wire. http://www.parts-express.com/Search....itesearch=true

  11. #11
    Junior Member murdoch's Avatar
    Join Date
    Feb 2008
    Location
    Manila, the Philippines
    Posts
    9
    Quote Originally Posted by audiomagnate View Post
    Dirty potentiometers (L Pads), NOT dirty caps. The caps may be fine.



    Wire really doesn't go bad. If the insulation rots then it should be replaced, but if it's intact, KEEP IT ORIGINAL. Collectors prefer these things in original condition. The fact that yours seems to be very close to original WORKING condition is a big plus. I hope you saved the old wire, but if you didn't, generic 16 awg color coded speaker hookup wire will do fine. I know you're not in the US, but here is what I use, unless someone wants to pay extra for "magic" wire. http://www.parts-express.com/Search....itesearch=true
    Oops....yup potentiometers not caps. Corrected sir. Thanks again.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Thanks with help Restoring L150's
    By tictac in forum Lansing Product Technical Help
    Replies: 11
    Last Post: 11-29-2009, 06:20 PM
  2. Restoring JBL Paragon
    By murdoch in forum Lansing Product Technical Help
    Replies: 1
    Last Post: 08-19-2009, 07:35 AM
  3. Restoring JBL C38
    By biglebowski in forum Lansing Product Technical Help
    Replies: 1
    Last Post: 10-09-2007, 03:31 PM
  4. JBL C 50 SM restoring
    By 38 inches in forum Lansing Product Technical Help
    Replies: 0
    Last Post: 11-13-2005, 10:27 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •