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  1. Today
  2. Hi Luigi, Thanks for posting the drawings. They are consistent with my experience. I have never seen an alnico magnet/cloth surround woofer in any AR-3 or 3a with date stamps showing manufacture dates after 1969. On the other hand, I have seen many of the notched ferrite magnet/foam surround woofers shown in the drawing in 3a's with manufacture dates from very early 1970 into 1972 (when the notches were removed). I have only seen a few post-1970 AR-3's, and they were also equipped with the notched magnet woofer...along with the AR-3a style mid. It makes sense to me that the ferrite magnet woofer would have been ready to go by 1970. This becomes important when replacing woofers in earlier AR-3a's originally equipped with the alnico magnet/cloth surround version. AR changed the woofer inductor coil in the crossover for the ferrite magnet/foam surround woofer from #7 (1.88mh) to #9 (2.85mh). When replacing woofers in earlier AR-3a cabinets it is therefore often necessary to increase the woofer crossover inductor's value to 2.85mh when the replacement woofer is the later ferrite magnet version. This will have a much greater impact on achieving the correct sound than the usual repair items such as level control and capacitor types. Roy
  3. Yesterday
  4. Tom, with your post you gave a great input ... Luigi your report seems like a great investigator's job, a lot of observation and detail, historical research, good reasoning and finally re-ordering of all the acquired data! I think that little by little, with the contribution of many other competent and passionate people, we will be able to recreate the two most delicate parts and those most subject to deterioration: Spiders and coils (the failure of one of these two particular causes the inactivity of our precious objects) . Being able to recreate these components in accordance with the original will be almost like winning a million dollar lottery for AR fans!
  5. fedeleluigi

    The AR 12-inch Woofer "Collapsed-Spider" Syndrome

    Hi Tom, Unfortunately, nowdays it’s very hard to accurately reconstruct the history of all that AR did and made. Unfortunately, many witnesses are no longer available (or the available ones do not remember the events exactly) and many important historical documents are lost. As regards the introduction of the 12” ferrite woofer, the dates of some AR drawings (magnet, cone-skiver and the spider in my previous post) would suggest that its production probably started in 1969 (please, see the attached pictures with highlighted dates). Obviously, the dates of these drawings do not prove with absolute certainty that the production of the 12” ferrite woofer definitely started in 1969. If the L.C.C., Loudspeaker Components Corporation, Lancaster Wisconsin (mentioned in some AR drawings) and today’s Loudspeaker Components, L.L.C., Lancaster Wisconsin are the same company, there might be a chance that it can still have some important documents (receipts, part orders etc.) that could be very userful for trying to establish the exact production date for some of the drivers made by AR. Luigi this drawing is the 4th in "AR Drawings" this drawing is the 316th in "AR Drawings"
  6. genek

    Unable to upload pictures.....

    Reduce image size to 640x480 or smaller at 72 dpi and save as jpg with quality set at 30%. You'll get a file size 100 kb or smaller. You can view your attachments in "My Attachments" (just under the link to edit your profile). Click on the post an attachment is uploaded to, download and edit the attachment to reduce file size, add the smaller file to the post and then delete the larger file.
  7. JKent

    Heathkit AS-103a Restoration questions

    Those surplus Russkie pots show up once in a while on ebay. I bought 2 but have not used them. Other members have tried them and may chime in. They appear to be well made but like the Ohmite pots they are open and therefore must be put in some kind of enclosure to keep the fiberglass out. From my experience with Ohmites I can tell you it's a PITA. But some members have made them (Ohmites) work. Here are 2 pics of Ohmite installations. CSP member Xmas111 did a beautiful job, using an enclosure made of wood and Masonite. My XO is less beautiful. I used a standard project box. Best solution IMHO is to follow the instructions in the AR-3a Restoration Guide and use L-pads (from PE or Madisound) with 25 Ohm 10w resistors on the mids. Also use resistors on the tweets if you go with Hi-Vi or Chris's rebuilds. One more thought. I've never worked on the Heathkit version but I can tell you based on working on KLHs--that metal plate can be a problem. Be SURE no metal parts touch it and if you remove the terminal screws for any reason observe how they are insulated and be sure to replace the insulation. KLH used 2 rubber washers on each screw; a flat washer and a shoulder washer so the screw was isolated from the plate. -Kent
  8. Moondogtn

    Heathkit AS-103a Restoration questions

    These pots are worse than others I have seen. I haven’t gotten to all of them but one is toast. I can’t get it to work at all...after cleaning up. So, for replacement pots, has anyone used these https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F264256977509 they seem to be close....25W 15ohm. If not, what is recommended Thanks
  9. GD70

    Another AR-3a restoration

    Nice progress Kent. The owner wil be very happy when he gets them back home and hooked up. Glenn
  10. Hi Pete, We have plans for the day, so won't be able to make it. If there's another get together, I'm interested. Have fun, Glenn
  11. GD70

    Unable to upload pictures.....

    Or, like me, you ran out of room! I cannot download any more pics. :>(
  12. Last week
  13. ra.ra

    Another AR-3a restoration

    Nice to see this detail - - and I agree with Larry - - a solid wire nut connection works fine for this purpose, and I've been re-building my speakers with this technique for the exact reason that JKent has already stated (future removal and access). Just be sure you put the Kimpac in before you connect the wire nuts. This 3a restoration project looks really good. Don't think I recall seeing you use Audyn caps before, but I know a speaker manufacturer in these parts that strongly advocates for this line of (red) Audyn caps. His opinion is that they offer excellent performance vs. cost value, and I'll probably be using this brand soon in some upcoming projects. Thanks for the meter info. That B&K meter looks pretty nice, and I've been thinking about trying one of those little cheapies, too, but I'm trying to find one that has a provision for wire leads with alligator clip. Thx Roy, I'll keep this in mind next time I poke my head into the pair I'll be working on.
  14. lARrybody

    Another AR-3a restoration

    That is a old KLH trick I think I learned from you several years ago.
  15. JKent

    Another AR-3a restoration

    Finished the 2nd xo (2nd one always goes faster). Scraped gobs of duct seal off one woofer and cabinet. Cleaned the woofer flange with alcohol & Scotch Brite to prep it for PE foam gasket tape. Also soldered leads to woofer terminal tabs. Woofer will be easier to remove if needed.
  16. newandold

    RDL Acoustics F-1

    might like it! Check it out now! https://ebay.us/XN1JUu Bill
  17. I saw a pair of speakers for sale that are interesting but a google search comes up with nothing. The label by the terminals say The Westminster and below it says Cathedral Sound Systems by Sterling. I did find a picture on the internet but it is an Asian website that I can't read. Anybody know anything about these speakers?
  18. HarryF

    Another AR-3a restoration

    Good Morning Kent, Look's like you're making headway nicely. Glad I brought them to you instead of trying it myself. Best regards, Harry
  19. JKent

    Another AR-3a restoration

    Finished one xo. I had forgotten how tight it is working inside that box but it’s all wired up. You can see the 3 original inductors across the top in this photo. Below those are the 6uF cap, Tweeter L-pad and Mid L-pad. Both have resistors installed per the AR-3a Restoration Guide. Then in the lower area are the 50+100uF bundle and the single 50uF cap. Some of the wires are new but I kept the original color coding. On to the other one, probably tomorrow.
  20. frankmarsi

    AR-LSTs from 15 feet away, see video.

    Video came down due to a uploading mishap and other than your receptiveness, there wasn't any participation, so no point. I'm wondering if 'administrator' will come in and help? Apparently capacity of uploads is full and I can't upload other files, in addition I cannot delete what's there to add new files, and the same thing happened in my other post. What originally started as fun has tragically ended.
  21. David Cutter

    AR 2ax Crossover Tweeter Issue...Need Advice Please

    Excellent solutions!...I read that someone painted the grill frame black to hide the cutouts. Magnets sound better than Velcro. Thanks.
  22. frankmarsi

    AR 2ax Crossover Tweeter Issue...Need Advice Please

    An excellent job and this approach should be the model for all of us here. FM
  23. lARrybody

    AR 2ax Crossover Tweeter Issue...Need Advice Please

    All the time. Here is a pair of 2ax's with the little pull tab made out of white satin ribbon. The grills are held in place with six 1/2 in round wafer magnets countersunk into the speaker baffle and six into the grill frame. I know it's been said many times here, but you cannot get anything more authentic than the 18 count lambswool linen grill covering available from 123 stitch.com I used the shere black grill cloth from parts express first just because I didn't want to see the grill cutouts.
  24. David Cutter

    AR 2ax Crossover Tweeter Issue...Need Advice Please

    Well...This morning I finished/tidied up the crossover business on both boxes. Experienced some frustration screwing in the woofer bolts as a total of three T-nuts decided to pop out whilst inserting the bolts. Had to glue them in and wait. They sound great...Very happy. My first time trying something like this. Couldn't have done it as well without the helpful people here. Next step is changing the dirty, discolored grill cloth. I've seen suggestions for replacement material that I will explore. I'm considering adding a pull tab to the grills to make removing them easier. Has anyone tried this?
  25. Moondogtn

    Heathkit AS-103a Restoration questions

    Long term project update. I just used shims when replacing surrounds and it was much easier as you could adjust height of cone to make it sit correctly. One of the 4 woofers was not salvageable due to a concentric break in voice coil bobbin. I’m trying to come up with something but haven’t yet. When I asked millersound about repairing using original cone, I was told they would not do that They suggested a complete recone as they said the voice coils on these fail shortly after new surrounds are installed. Has anyone experienced this? Min getting ready to work on crossovers. Do most folks completely remove the crossover from the cab or just removed the pots and caps as needed? I will post pics of the mids I purchased. They were damaged during shipping but I think I saved them. I will need to dig up pics to post.
  26. frankmarsi

    Do AR speakers really sound that good?

    Isn't anyone going to describe and share what they're listening to by simply posting a video? Has this site become a tinkerer's workshop and not that of listeners? Comparing to the car world, are we the 'pit-crew' at the car race and not the 'Drivers'? The winning rewards are in the driving, not the changing of tires and the wiping of windshields.
  27. lARrybody

    AR 2ax Crossover Tweeter Issue...Need Advice Please

    I have used cheesecloth from the grocery store with success.
  28. They'd like you to bring your 3 's if you are still interested, bring a friend or two if you'd like. We have excellent turnouts, I expect 30 to 40 people. I'll PM you if you are interested.
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