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ra.ra

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  1. ra.ra

    Refoam AR-9 woofer

    I think Stimpy may be offering very good advice here. The part drawing for the 12-inch 003 woofer clearly shows the masonite ring at both surround and spider locations, and this is nothing more than typical 1/8" nominal thickness hardboard. The cone excursion may be somewhat limited without the ring, but I suspect that limitation would only show up at high volume levels when the woofer is pushing some really big air. If the performance is this satisfying with your typical program material, there's probably no need for further corrective measures.
  2. ra.ra

    AR 8bx original tweeter?

    The attached text is the full description of these speakers in the AR literature - - - with "one-inch low mass liquid cooled tweeter" - - so I can't help you with the Mylar / Audax / fabric dome questions. The Library does not seem to have a more detailed drawing of this tweeter. Also, I would not be the best person to recommend a more modern driver because I am mostly unfamiliar with what is available. AR's various 1-1/4" cone tweeters are favorites of mine, too, and with some careful shopping you can be reasonably assured that they should be good for years to come. I use these all the time in many AR speaker models, but I wouldn't know how one of these might work in your project - - how to adjust the crossover.... or will it even fit your cabinet? If you look at the AR-8b (with no "x"), you'll find an excellent little simple speaker with a 6" woofer and 1-1/4" cone tweeter that might serve as a guide for your 'mod' project.
  3. ra.ra

    AR 8bx original tweeter?

    Hi Neal, welcome to the forum. I don't know this line of speakers at all, but from looking at AR literature, it appears that your tweeter is probably the same as the ones used in the AR-6bx and AR-18bx. If so, this schematic for the 6bx identifies it as part number 210068. There is one available in current online auction, but it's located in the UK (attached pic).The literature is from 1988 which makes your speakers about 30 years old, so replacing the capacitor might be a prudent move. I wouldn't bother messing with the inductors, however. Best 'o' luck.
  4. ra.ra

    AR 9 Crossover Rebuild

    All very good sources.... thanx for the tips. FWIW, here's another supplier (also from Canada) that I sometimes like to use. They have several lines of Solen caps you cannot find at other places (most are $$$ expensive....sigh...) as well as everyone's favorite and reliable Dayton caps. While their overall product line is somewhat selective and limited, I particularly like the very affordable LYNK MOX resistors. https://solen.ca/
  5. ra.ra

    AR 9 Crossover Rebuild

    That's really the only point I was trying to make. You know far more about this than me, but I'd suggest that if the outer limits of the stated 10% variation are going to be unacceptable, one might want to pay for the "matching" service that several purveyors offer to ensure more consistent measurements. I fully agree that measuring is important, and it is clear to me that your personal criteria for cap selection is far more stringent, nuanced, focused, and particular than are the selections I make for my own humble projects. That's all OK - - no real bone to pick - - but I do sometimes question the expense involved in some of these re-cap "upgrades", which is why I was delighted to see harry398's report from his experience.
  6. ra.ra

    AR 9 Crossover Rebuild

    Wow!.....after reading all about the virtues of the costly capacitor brands running into the hundreds of dollars, this is a very strong and refreshing testimonial on behalf of the much-maligned NPE cap, which is probably not all that dissimilar from what the original designers used at the factory. "Different strokes for different folks", I suppose, but it's really good to see an endorsement of a simple and inexpensive solution that resulted in very gratifying results. Not sure I understand this statement. If these caps are noted as 10% tolerance and they all measure as such, aren't you getting this product "as advertised"? How can this be construed as "all over the place" if they measure within the stated spec?
  7. ra.ra

    Are these AR speakers?

    Great little project - - with grille on, they look like a hybrid of KLH and early Advent. Well, it sounds like you're getting somewhere - - I wouldn't know how to assess a particular woofer for its applicability regarding cone excursion, nor would I know how to calculate optimal cabinet volume. For that build-up of white residue on driver backsides, you may want to first clean 'em up with a vacuum, and then wipe down with a rag moistened with household white vinegar. Looking forward to following your project.
  8. ra.ra

    Are these AR speakers?

    I would agree that a cap replacement is simple, inexpensive, and might make a significant improvement. Not sure if the two controls are accessible for inspection, but this might be a worthwhile exercise as well. The cabinets look really great, but as you've already mentioned in your initial post, there's a real temptation to possibly re-construct these as acoustic suspension speakers. This, of course, would require sealing all drivers to baffle board; sealing b-board to cabinet box; closing off rear port openings; and sealing rear panel to box. A bit of work, to be sure, but that's where a lot of the mad-scientist fun might be found. I've seen plenty of three-ways that use cone mid drivers that require a separate chamber, but have never seen this chamber with its own vented port. This chamber needs to be sealed from the main chamber, including where the wires penetrate. BTW, it appears that the stuffing is all probably fine - - the cellulose and fiberglass both appear to have maintained their original loft and are both effective fill materials. Without having tested these speakers to establish a base line for evaluation, exactly how would you define "better"? Far be it for me to dampen enthusiasm for experimentation, but when I see vintage drivers in good shape with massive alnico magnets, I let out a sharp wolf whistle and say "Ooh-la-la". I'd love to see the front side of those drivers, but that would require some extensive disassembly, and it's hard to see how to remove that tweeter for further inspection - - it might require removal of grille cloth. For less that $4 invested, you've already got a nice little bargain project, and my suggestion is to try to achieve a big bang for small bucks, which often leads to smug satisfaction. BTW, how do the speakers sound "as-is"?
  9. ra.ra

    Are these AR speakers?

    Not sure I fully understand the multiple port slots on the backside, but those are beautiful cabinets with very nice proportions. And by the serious looks of these robust drivers, I think you should work with what you've got. Maybe this thread can be moved to the "other" forum?
  10. ra.ra

    AR woofers

    Hey, those look really good - - I definitely think you should try those out. Hard to tell, but I think the only difference between yours and the woofers I posted earlier is that it looks like yours have the added fiberboard rings underneath the surround and the spider, as shown in pic attached. I don't think this should affect performance, but the rings make it a little more difficult to complete the re-foam process. I have encountered that woofer (w/rings) recently with some AR-6 (v.2) speakers. Interesting to see that these woofers came from AR-16's - - that is very much an "under-the-radar" model which never received much attention or recognition, despite it probably having used high-quality components. Let us know how this works out. Also, if you get the chance, please show us what the crossover network looks like. Thx.
  11. ra.ra

    KLH Model 6 paired with 15-17 watt tube amp?

    Not sure about the 299 amps, but the 222-D has multiple terminals to adjust for a variety of speaker impedance ratings. That Pilot looks like a cool little amp, and it appears that it also has multiple taps, but only for 8 and 16 ohm ratings. (Pic courtesy of Redboy) For the KLH Six speakers, you'll want to confirm the condition of the crossover capacitors and also ensure that the woofers maintain a good seal to the cabinet enclosure.
  12. ra.ra

    KLH Model 6 paired with 15-17 watt tube amp?

    I fully agree with Kent here, along with his disclaimers and limits. For most of 45 years, I have often paired a modest 26-watt Scott integrated tube amp with several 8-ohm two-way vintage bookshelf speakers, and have never been disappointed. Further, I have never blown a driver or fritzed an amp. My tube amp is the 222-D, which is part of the EL84 family.
  13. ra.ra

    AR woofers

    Wow....your MST's look terrific - - great cabinet, grille, badge, tweeters - - too bad about the missing woofers. Nice to see you have the later three-tweeter MST/1 version - - this is purported to have superior performance to the earlier and original four-tweeter MST. And yes, the AR-8b is a great little budget speaker, but as you've noted - - only a 6-inch woofer. I don't think you want a woofer from the "4" series - - particularly the cloth-alnico versions - - it was intended for a different loudspeaker system. The woofer you want is clearly shown in this thread by CSP member Alessandro, who has a beautiful pair of the four-tweeter MST's. Also shown is a pic of the proper MST woofer, which was also used in the AR-7.
  14. ra.ra

    AR2ax Help/Advise

    Thanks....yes, that's what I would expect.
  15. ra.ra

    AR2ax Help/Advise

    As much as I try to pay attention to the numbers on these tags, sometimes another indecipherable code comes along to confuse us. A very similar looking tag appears on this 8-inch AR-6 woofer. I just dunno...... Which one had the higher DC resistance reading?
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