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ra.ra

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About ra.ra

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  1. ra.ra

    AR12 Crossover network

    Here's what I can dig up. Hope it helps.
  2. ra.ra

    Prototype or DIY?

    Ahh....OK, now I see what you mean - - - yeah, I can understand how that first pic in the second post might suggest a similar double magnet arrangement, but no, this is clearly the tweeter magnet that has wiggled loose. This tweeter does not have a cone - - it is a 1-inch dome type - - - and I am just not familiar with what needs to be done for proper re-assembly. Re: epoxy, yeah, I have an easy-to-use two-part epoxy that would probably work well when that time comes. Thx.
  3. ra.ra

    Prototype or DIY?

    .....oops, I was running out the door earlier and didn't mean to sound so curt. Many members here aren't much interested in small speakers, and these don't necessarily even belong in this forum, but I have great respect for the cumulative knowledge and opinions of the CSP membership. Re: these speakers, you can see clearly what I've found, what I've learned, and what I've uncovered - - - and now... where I need advice. There is quite possibly an interesting backstory behind these, but I have no absolute confirmation that these ever had much involvement with Roy Allison. Still, the possibility that two giants from the 'golden era' of NE speakerdom had involvement with these one-offs provides sufficient intrigue for me to share this tale, and now I need some detailed assistance. Hi ligs.... and thx for your post, but I haven't got a clue what you are trying to describe here. The pic of the two attached magnets indeed baffled me at first, but I soon realized what had happened to the 'damaged' tweeter (the glue joint failed). How it happened?- - - - we'll never know. The attraction between these two magnets was very strong, and it took some effort to separate them. Now...who knows how to re-assemble this tweeter?
  4. ra.ra

    Prototype or DIY?

    I can only go so far in vouching for their provenance, but thanks for your help.
  5. ra.ra

    Prototype or DIY?

    Here's where I need some help. The tweeter VC has continuity and DCR measures at 6.2 ohms (similar to the other) but I'm not sure how best to re-assemble the parts. How to ensure proper alignment? What is the sequence of steps? Any special tools required? What type of adhesives?
  6. ra.ra

    Prototype or DIY?

    Taking these apart revealed the components - - nothing particularly unusual here, but the first glance at the backside of this woofer made me think there was some mad scientist at work here - - what's this double magnet thingy? It was soon determined this speaker was not functioning because: a) the coil wire had become detached from woofer terminal; and b) the tweeter magnet had completely separated from VC, dome, and face plate. The drivers each look familiar but have no ID marks except the woofer, which has a date sticker from August 2002. The tweeter has a 3 ohm resistor in series with a 4.7uF cap, and the woofer has a 0.90mH coil (one is .040 + 0.50 and the other is 0.70 + 0.20). Other pics show cabs patched and sanded, and comparison with similar speaker models for reference. Shown L to R: Realistic Minimus-11, topic speaker, ADS 300, Minimus-7.
  7. Am just posting this mostly as a curiosity, but of course, seeking comments, questions, and suggestions as well. This pair of mini-speakers (6.25" x 9.25" x 6") was found at a weekend flea market - - the seller was a guy who is very knowledgeable and lives just down the road from where Roy Allison had his company in Natick, MA; also, seller was involved somehow in the liquidation of the estate of Victor Campos in Framingham, MA. Some months ago I posted in the Allison forum about an Allison equalizer (The Electronic Subwoofer) which was being sold by the same seller, and that piece of gear also involved Roy and Victor. This pair of speakers is some kind of one-off experiment - - perhaps even a prototype? - - and appears to fit somewhere within the typology of a Realistic Minimus 7 or 11 or 12; or perhaps an ADS 200c or 300c. These were packed nicely in a box-to-fit with address label (postmark date is October 2003), and were wrapped in several bands of clear packing tape (?). No rear wiring terminals - - just separate pairs of tweeter and woofer wires extending thru rear panel. The speakers are heavy - - cabinets are fabricated from nominal 1/2" high quality MDF with neat miter and dado joints. Upon initial test, one speaker is working; the other is mute. That's all I know so far. More info once I poke around inside.
  8. ra.ra

    Epi M50

    Way to go in resuscitating a thread that's been dead for 5-1/2 years! As an admirer of great small loudspeakers, I'd love to find a pair of these, too. I have an early pair of EPI M100's, but these little guys have a very special charm.
  9. ra.ra

    1966 AR3 rescue

    Hi Howard, and welcome to the forum. Good luck with your restoration efforts. Am just curious which version of the Scott 222-D you have - - - I have one like the top version shown here.
  10. This is a terrific post, and I totally agree with Larry's assessment. The AR-15 is a somewhat rare model, IMO, and I suspect its excellence can be attributed to at least three factors: the large-ish cabinet volume; the unique 1" dome tweeter; and the surprisingly sophisticated crossover circuitry. Perhaps.....85dB for the AR-15, and 86dB for the remainder of this series. Does this small difference in published laboratory measurements really have much validity once these speakers are 45 years old? The AR-91 is a terrific loudspeaker and it has plenty of ardent fans on these pages. This is your forum, too, so do make a point of telling us more about why they are among your personal favorites. My own (biased) suspicion why they might not get as much airplay here is because all of the floor-standing vertical speaker models are far less visually appealing than the earlier "bookshelf" models, and therefore they take a backseat. Performance-wise, I believe that some members may find the AR-91 to be the pinnacle of the 12" three-ways.
  11. ra.ra

    AR-2xa?

    The fact that the AR-2xa is so rare is reason enough to care about these speakers, but even more so because yours are in such great condition (BTW... is the veneer walnut or teak?). Aside from the thin-line Euro cabinet edge profile and the dark grille cloth, it'll be interesting to know what the differences are between this model and the far more common AR-2ax which necessitated the change in model designation. For reference, the cap values for the 2ax are 4uF for tweeter and 6uF for midrange. Please let us know if these speakers have pot controls or switches. You've got a great find there. Keep us posted.
  12. ra.ra

    Australian AR6's resto

    This may have been brought up before, but I cannot recall a satisfactory response, so I'll stick it in this thread. I've been curious why the AR-6 is the only model which has its woofer purposely misaligned from the N-S centerline of the front baffle board ........ any thoughts?
  13. ra.ra

    Australian AR6's resto

    Good to hear that this worked out well for you - - it's important to have some personal fun with these restoration projects. Your speakers look great, and thanks for the update on the 10uF Sprague Compulytic measurements. Did you happen to re-measure the 24uF Royalitic cap with the Fluke? In my current AR-6 project (still in progress), we replaced the caps with a semi-generic 10uF film cap (pic attached shows wire nut connections for easy cap replacement), and even without stuffing or tight seals on the drivers, the speakers sound very good already in primary test run. I have made no weight measurements, but jeepers..... these AR-6 cabs are surely stuffed tight and full with gobs of FG. Good eye.....my closer look confirms your statement - - - put another way, in each of four AR-6 (B) speaker cabinets, I have found the positive (+) terminal of the tweeter to be connected to the green wire, which ultimately connects with the 2 (+) terminal on the rear of the cabinet. And here are two more...
  14. I'm not familiar with the Fisher 400, but I enjoy several models of small AR two-ways using very modest amplifier wattage. My favorite amp is a ±26 watt Scott tube amp from the mid 60's, and it is superb with any early 8" two-way models I have paired it with - - - - AR-4, 4x, 4xa, 6, 7.....etc. Re: the AR-15 - - - it is a terrific speaker model, but the pair I've seen put up on online auction are problematic. The seller does confirm that the tweeters are non-original, but methinks this applies to the woofers as well. I mention the 8-inch two way models, but I suspect the 8-ohm 10-inch models (AR-2a, 2x, 2ax, 5, etc.) would work almost equally well. In 1971, AR literature recommended 20W per channel for the AR-5.
  15. ra.ra

    Australian AR6's resto

    Hmmm....... very good point, and I cannot remember if this has been discussed before in this forum. It is not unusual for some AR speaker drivers to sometimes be wired with reverse polarity, but I am drawing a blank on this one. I will try to look into the two similar pairs of AR-6's here to see if I can add any further observations. One other minor thing about that schematic B: don't know if it makes any difference, but it looks like the coil is shown on the wrong side of the woofer - - - compare with crossover pic attached. Also, I wanted to include here this great diagram that RLowe provided to help me better understand the operation of the switch.
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