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  3. @Jim Pearce I have a working pair for sale, do you still need them?
  4. Hi Teknofossil, DonT long ago published on my request the AR3-st scheme, under the photos You find the thread by typing: original AR paperwork I have! I also used AR-1MS to make a medium / high section only to the AR2 woofer (I still have to attenuate the small AR-1MS with appropriate resistances!), Find the thread in the Mods section (moved there by moderator Genek!) Under the title: AR-2t I hope I've been helpful Giorgio
  5. There were two add-on modules. The AR-3st contained the dome tweeter only and the AR-3t added both the mid and tweeter. Don't have schematics, but here's what they looked like with their backs open.
  6. ligs

    AR MGC-1

    Here is the schematic for AR MGC-2. I suspect MGC-1 would be similar except for the bass section. AR MGC-2 x-over.tiff
  7. Hello. Does anyone possibly have a schematic for this module that AR sold intended to upgrade the performance of the AR1 and 1w to a AR3 levell? I'm sure my responses will say it is the same as the AR3. Does the module duplicate the whole crossover or just the the high pass filter to the midrange driver? Thank you! Tom
  8. Larry, The AR-3a/AR-11 mids' cloth dome suspension is a cloth roll, like a modern tweeter, and does not degrade or require maintenance. Other than front vs back-wiring there is not much difference between your mids. They will all work well with the crossover change mentioned above. Roy
  9. Today I picked up a pair of AR3 speakers, serial numbers C35565 and C35411. They look pretty much original except the mids are A.13 type from some MkI AR11 or 10pi speakers. I don't know yet if any crossover mods have been done. I have a pair of nice A.11 front wired mids (the type without the center dot) from some 1969 AR3a speakers. I know Roy does suspension work on AR3 tweeters and midranges, but does anyone work on the AR3a midrange suspensions which have probably degraded by now?
  10. Last week
  11. Hey Chris, I'm not sure it is worth the conversion effort without a properly functioning pair of original type AR-3 mids with which to compare. Using the 3a mid with the appropriate crossover modification (addition of a .4mh parallel coil, and removal of the .06mh series coil found in some iterations of the 3), can result in a significant improvement over a typical pair of AR-3's with degraded original mid drivers, but although the outcome sounds quite satisfactory in terms of being in AR-3 territory, it is not exactly the same as a pair of 3's with properly functioning original mids. AR adapted the later 3a type mid to the AR-3 in the same way as we have implemented the more modern HiVi tweeter in early AR models; using a parallel coil to bring it into the overall sonic ballpark of the original. As you well know, however, using a rebuilt original tweeter allows the use of the original simple crossover, which results in somewhat different sonic characteristics and system interactions. While both tweeters are quite satisfactory for most people, there are some sonic differences which may be of consequence in a discussion of this nature. I believe it is the same for the AR-3a mid as used in the AR-3. Roy
  12. Pete B

    AR MGC-1

    I have a vague memory of seeing it could have been in the library here or perhaps there was a patent?
  13. Hi Chris....I actually did this to a pair of 3's as the mids were shot and had an extra pair of 3a mids. I did what Roy said to do. They sounded okay...but seemed not up to par. I eventually found a pair of 3 mids...changed everything back...and got the sound back I liked. I am certainly no sound expert but just an opinion. Maybe I didn't have something correct?...dunno. I would curious to see what you thought if you do this. No big deal to change it.
  14. That makes sense to add the level controls. It is interesting how different these are from the AR-11 for example that has 10 uF in the tweeter circuit and a bigger inductor on the woofer. The midrange differences are expected since a different mid driver is used.
  15. Stimpy

    AR MGC-1

    Unfortunately, I've read comments from Ken, where he no longer has crossover schematics either. So, unobaitium, at this point, short of an MGC-1 owner tracing out the wiring?
  16. to show your Christmas AR speakers🎄
  17. Pete, the drivers are identical in these two speaker models, and the crossovers are, too, with the exception of the switches and associated resistors included with the 91. Larry's objective here is to add the switching capability to the 58s which originally had no such control. From what I can tell, aside from significant variations in styling, the only other difference is the interior cabinet volume: 46.8L (1.65 cf) for the AR-91; and 43.6L (1.54 cf) for the AR-58s.
  18. Pete B

    AR MGC-1

    I'm not sure if I've ever seen the XO schematic. You might ask Ken Kantor, or some of the experts on here. Please post it if you find it.
  19. Thanks very much!ACOUSTIC SUSPENSION_Audio-1955-Jul.pdf I used pdfSam (free program) to chop out the specific article.
  20. Here's a LINK to Audio Magazine, July, 1955 which on page 18 has an easier-to-read version of the first article Pete B posted above. BTW ... the RADIO HISTORY site is a joy to me, audio nostalgia extraordinaire! The site itself looks like something I might have created (style-wise) 20+ years ago ... probably usable with Mosaic! Here's a link to its home page: https://americanradiohistory.com/ Oh, and just a warning, if you haven't been to that site before you might want to grab a glass of wine and plan on hours of fun time reading.
  21. Here's a link to the thread I started back in 2017, regarding a pair of last generation 3's that I found: I really do intend to finish these at some point, other stuff just keeps leapfrogging these on the priority list.
  22. Thanks Glenn, that would be the plan should I go forward with this. I am reluctant since although with the crossover mods, I am still locked into using an AR3a mid. Wondering how close it would sound with the mods to an actual AR3 mid.
  23. Stimpy

    AR MGC-1

    That, and I'd love to see a crossover schematic...! Please...!!!
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