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Everything posted by DavidDru

  1. Maybe you guys can help me make sure I get this right. Shouldn't be difficult but there may be some things you might offer up as I go here. As you may recall from my AR9 thread, while the 4 woofers all worked, they had been refoamed along the way. Rather oddly as can be seen in the photos. Almost like they put them on upside down just to get them to fit. Must have not had the correct surrounds. I removed the old surrounds on 2 of the drivers last night. Came off fine, but I will scratch at the edges a little more maybe. I like to use a dull exacto blade to help as I go. Since these were replacements they weren't as deteriorated as we often see when removing old foams. Plus it's the 2nd coat of glue. Otherwise these cones are pretty tough and I really wasn't worried about them as I went. I dont think I want to use rubbing alcohol pr acetone on the cone edges unless you guys think I can. They are pretty smooth now. You will also see the staining on the cone of the one as well as the associated surface corrosion on the frame that I will have to clean up. Would still like some ideas on how to clean the cones if possible. The woofers on the AR9's are of course down low on the sides of the cabinet and these no longer had the grilles so were exposed to lord knows what. Could even be cat urine although no smell. Now I also am wondering about the cardboard ring that is attached to each frame. I assume those are not supposed to be there? Something the previous effort added to make those other foams fit. Both rick Cobb and Tom at myaudioaddiction have the correct surrounds for these and both suggest using the test tone for centering so you don't have to get into the dust cap and coil. I have had nothing but great results with that in my other refoams. Btw, these all tested good at 2.8- 3.0 ohm
  2. DavidDru

    AR 11" woofer driver refoam (AR9)

    Been too long ago now Pete that I can not recall.
  3. Shockingly good after a recap and new surrounds on mid and woofer. New trim pads on tweeter and mid that I got from Glenn. WOW! is all I can say. I have them in my 12' x 12' room hooked up to my WOPL 400 (230/ch) SS amp and tube preamp and they absolutely jump out at you and image great. Really good detail and the bass is all you need in this room at all levels. Also tried them with the Dyncao ST70 and now with a The Fisher TA600 tube receiver and those do well with them also. A bit more gain is required of course. I used Dayton 1% poly's in the recap. Will probably go back in and replace those darn AR binding posts. Damn things drive me crazy! Next up though is fabricating some new grilles. Going to go with the raised beveled edge like Glenn did in his. I may contact foamspeakergrilles to see what they would charge to make some up like I have for some big Altecs. I am full in on looking for AR11's or 10pi now.
  4. DavidDru

    Okay, these AR12 are awesome!

    Grab em if you come across them for sure! Replacing the surround on the mid and the trim pads around the tweeters and mids make the restoration a bit more work, but well worth it. I really like how the cabinets look with the thin edges too. I will post photos as soon as I have the grilles done. Time to find the 11 or 10pi, although these are probably all I really need in my room with the quality and power of my amplification.
  5. DavidDru

    Okay, these AR12 are awesome!

    I think the surrounds are already there Glenn! Thanks for the trim pieces for the tweeter and mid. They look great. Whatever the adhesive was on the originals is some tough gooey stuff. Now to do the grille frames.
  6. DavidDru

    Okay, these AR12 are awesome!

    Great idea Larry. In fact I did do just that last week on a connection to a pair of super tweeters I added to my Concert Grands. Early ones for me too I think. They are some sort of metal. I didn't do the bypass caps. Suppose I could have since I have those little caps here for that.
  7. Excellent. If you ever see a nice pair of KLH Model 17, 23 or 6, give those a try as well.
  8. DavidDru

    AR3 with no finish. Where to start?

    Welcome Richard, and nice find for sure. Some of the best surviving examples of AR's are turning out to be ones that had been used in applications similar to what you found with these. Preserved in other cabinets or up on shelves. I have AR2's and AR5's that were in cabinets and are now great unfinished specimens. Personally I struggle with the unfinished cabinets versions. I know they are a bit more rare which can translate to higher collector value, but they just aren't very good looking. 😏 Nor does any finish you can put on them do anything for me. Mine get no use because of this aspect. Without the collector value thing, I'd probably go ahead and do a great wood veneer on them. Doesn't take away how good they sound of course and they are fun to restore (well, maybe one AR3 restore is enough). Good luck with it. My guess too is that the pots are the only issue, especially if they sound good now.
  9. I bet the AR12 would be nice. Mine are hooked up to considerable SS power right now but I have a restored Dynaco St70 sitting next to the SS amp and I will switch it over to that today to check the difference. I also have a recapped and restored The Fisher TA600 receiver I can try with them.
  10. DavidDru

    AR12's Restored-A few Pics

    Lucky once again and acquired a very nice pair of the AR12's today from the one and only owner since he purchased them new for 10% off list at $450 in March of 79. The purchase receipt and brochures and manual all come with these so that is cool. Serial numbers are 2 numbers apart. The cabinets will require very little work but new grilles are needed. All the drivers interestingly enough are factory replacements. He told me he thought he had them replaced around 1990 and right before they were no longer available. Phew! All of these drivers need the usual age-out attention, but all work. Woofers just need new surrounds as do the mids. Tweeters and mids need the outer plate foam pieces and I hope Glenn can help with those. Hey buddy. Will get a recap too of course. 40, 20, 10 and 6. The ferro fluid thing is interesting. I recently replaced the ferro fluid on some KEF104/2 and it was pretty straight forward easy as long as you know the amount. Check out the photo with the teledyne acoustics sticker on the bottom of the rear plate and how it was meant to cover the AR logo. I hope I summarized the approach well enough. I gathered together this strategy after reading various threads on the 12's here and at AK.
  11. DavidDru

    AR-12 crossover

    Well, outstanding timing as i too need it to know what value caps I need to order for the 1's I picked up today.
  12. DavidDru

    Avid Model 230's here

    Went to pick up some AR9 drivers at a local sellers house yesterday and he had a pair of 230's in really good condition he is wanting to sell. Researching them they look like pretty good speakers.
  13. DavidDru

    RDL Acoustics F-1

    Picked up a great pair of RDL Acoustics F-1 this weekend. A mere $80. All is good with them. May need new surrounds on the top woofers. They are in-tact but in that stage of where it seems like you could put your finger through them. No biggy. Great cherry finish and overall styling with these, which I think Roy A. was pretty good about over the years. Currently being driven by my fully restored Pioneer SA-9100 at 60/ch. I will put them in the main system where I can go 240/ch SS or 35/ch tube and see what they do. They seem a little in want of power. Love Roy's tweeters. I feel fortunate to have a pair of these as they seem rare as hens teeth these days. They proudly join My Allison Ones in the collection. Hey from the Mountain Pacific Northwest!
  14. DavidDru

    Newly acquired AR-LST

    Easily. The kLH28 they are for about the same size as the LST's actually.
  15. "no sales ever allowed" Can't even imagine that approach these days, and it's a shame.
  16. DavidDru

    Newly acquired AR-LST

    Cool. I have had some KLH Model 28 stands (tulip) listed over at AK for a while now. I bet they would be great for those.
  17. DavidDru

    Repatriated AR collection

    Well, we will miss you out here Roger, but it's great to hear you are happy with the move back to the old stomping ground. Apparently the restraining order has expired. Make the most of it.
  18. DavidDru


    Fun stuff there guys.
  19. DavidDru

    Ar3 for $2,600?

    What am I not seeing here beyond that crazy high price they sold for? http://www.ebay.com/itm/VINTAGE-Acoustic-Research-AR-3-SPEAKERS/282611068645?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649
  20. So, those of you that have the 9's do you bi amp them? If so how do you have yours set up? Vertical passive? Horizontal passive? What gear have you used? In my case I have the Adcom GFA 5500 and am thinking about getting another. I have a few different preamps to choose from including the Adcom GFP 565, Xiang Sheng tube, and my recently purchased Citation 1. Let's hear your success stories.
  21. DavidDru

    L710 conundrum????

    Hmm, Rob, those do look odd, including the mids and tweets. Here is my 710:
  22. Came across an exciting opportunity to pick up a somewhat rare Technics turntable the other day. It is the SP-15 table with EPA-501H arm, EPA-B500 mount on the SH-15B1 plinth combo. The plinth is a very nice Rosewood. The current cart is only a Shure M44-7 and will be upgraded. Did not include the dustcover. This professional table from 1981, was sold to consumers and radio stations. It wasn't necessarily used at the stations for playing the music as much it was used in production rooms for under voice overs etc. it weighs in at 50lbs/22.7 kilos. It is manual. Has a lot of torque and ramps up to speed immediately then brakes similarly. Specs are impressive. I got it from a local Professional Broadcast Engineer at the local PBS radio stations. He got it out of a station warehouse and refurbished it (mostly just dust and lubricant age). Thought I would share since it is a little off the beaten path. My SL-1300 is next to it in the photos to help illustrate it is a big one.
  23. DavidDru

    M-907 to be restored

    I found a very nice original owner set of Dahlquist M-907's listed on Craigs List in a town I was heading to for business and was driving. After some research on-line, and there was not a whole lot out there, it seems the entire M line is overshadowed by the much more popular and in service DQ line. The little I was able to read on them, folks were really surprised and impressed once they heard them. That's the sort of stuff I like to be on the look out for. Sneaky good. These are a 3 way model that is somewhere between floorstanding and a large format bookshelf that came with it's own stands. For me to bother, they had to have the stands and these did. Overall they are in great shape and will not require much exterior work. The grille fabric could be replaced but that will be a bit more challenging than usual even though it is juts the modern black stuff. Each grill is trimmed on each side nicely with solid wood slats but the fabric is attached underneath them. I am sure they are glued and possibly doweled on so I will hope to get lucky and be able to pop these off once I try. Till then I will just clean them up and see if the few small holes and snags just kinda fade away once clean. These have the Advent woofer with Vifa tweets and mids. The surrounds are deteriorating and I already have replacements ready to go from Rick Cobb. the baffle is coverd with felt and I am not sure if that is for looks or for some sound reasoning. Doesn't matter as I think it is a nice touch either way. I have them hooked up and playing at low volume and even with that they really do sound nice so I am looking forward to post new surrounds.
  24. DavidDru

    Newly acquired AR-78LS

    The car analogy is a good one. One would wonder what would have happened if AR had kept the model number going and just made changes to it over the years like they seemed to do for a while with various models (3 -3A, 2-2a-2ax etc). At some point they either felt the design changed enough to call it something else, or the marketing people finally got their way. No doubt, the 3 and 3a were the industry standard for write some time and I am sure other speakers manufacturers probably tired of being compared any time they came out with a 3-way design of similar proportions.
  25. DavidDru

    The Quintessential AR Speaker

    Great responses above. And I will throw in my response....in era's. The AR3 established AR and defined so much for the brand and in the industry, as well as customer expectations from that point forward. The 2nd era would have to be the AR9. Both made huge statements.