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Giorgio AR

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About Giorgio AR

  • Rank
    Advanced Member
  • Birthday December 29

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    giorgio.purger@libero.it

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  • Gender
    Male
  • Location
    Trieste, Italy
  • Interests
    HiFi, Acoustic Research speakers,old motorcycles and cars

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  1. Giorgio AR

    Ohm specs hi-range Ar3a 1974-75?

    Hi Kallek, I can give you 1 terminal nut, I am attaching 2 photos with 3 original nuts of different years , all three slightly different, so you can compare yours and choose the one that suits you best (just ask me if you want 1 - 2 - 3, I keep them in the same position as the photos!). No cash request, I will only ask for shipping costs (registered post service). You can safely email me a private email. Greetings
  2. Giorgio AR

    AR woofers surround reinforcement

    Thank you for your technical answer, my curiosity was due to the fact that this ring on the surround I think appeared for the first time on the AR3a woofers with ceramic magnet and remembers the ring (of different material) placed on the external periphery of the woofer cone with Alnico previous magnet and cloth surround, I attach a photo with this ring highlighted
  3. I have to give you an input on the weight and mass of the cone assembly, coil, spider, foam of a 12 "ceramic woofers. Pete b. And Luigifedele, weighed, measured the cone, coil etc. of the 12 "woofers. All is well, but the weight (and is missing in all the subsequent refoaming to the original) of the bead of thick glue around the inner ring of the foam, at the time, when I removed this material, the weight was a few grams, therefore in percentage on the high cone! Besides the fact that mechanically this "reinforcement" on the foam changes its response to oscillations. All refoamed woofers, I think they need to be weighted on the periphery of the cone? What do you think , I am attaching a photo where you can see very well this ring on the foam of a 12 "woofer, ring that I found on all the original untouched AR 4", 8 ", 10" and 12 "? I found the ring of "glue" of an 8 "woofer (I didn't find the 12" ring), it was photographed, above and below and measured the width, about 5 mm., 1/5 ", I don't have a scale to weigh the ring. Does the presence of this ring as well as suspension damping make sense as adding weight to the cone in the periphery and for stiffening the cone? The first photo shows the ring of a 12 "woofer with the arrow, the other three photos illustrate the 8" woofer ring
  4. Here is my CTS phenolic tweeters inserted in Fisher XP6 cabinet. These tweeters are original USA, dated 75 03, have large ceramic magnet, brick color ring, black paper. In the photos you see the flange built to adapt the tweeter to the original hole of the XP6 cabinet, the original dome tweeter. These tweeters, purchased NOS before had been tested in an AR4x cabinet, where they adapt without modification to the original hole.
  5. Hi Tom, another input: I have to give you an input on the weight and mass of the 12 "ceramic woofers. Pete b. And Luigifedele, weighed, measured the cone, coil etc. of the 12 "woofers. All is well, but the weight (and is missing in all the subsequent refoaming to the original) of the bead of thick glue around the inner ring of the foam, at the time, when I removed this material, the weight was a few grams, therefore in percentage on the high cone! Besides the fact that mechanically this "reinforcement" on the foam changes its response to oscillations. All refoamed woofers, I think they need to be weighted on the periphery of the cone? What do you think Tom, I am attaching a photo where you can see very well this ring on the foam of a 12 "woofer, ring that I found on all the original untouched AR 4", 8 ", 10" and 12 "?
  6. Hi Tom, the 12 "woofer spider argument is useful in keeping our beloved woofers in shape. I am writing to ask you what you think about my idea, following a test of mine to reposition the spider in the right resting position (it was sunk about 5/6 mm downwards) I turned the voofer upside down by placing it on my pellet stove for about 20 ', slowly the cone went down to the stove floor; then I removed the speakers from the stove and tried positioning the correct spider alignment vertically, it was perfectly horizontal, then I repositioned the woofer again with the cone facing down and thickened the circumference until the spider was horizontal again, leaving it to cool the speakers for about 30 ', I checked: shape of the spider, rest of the cone in the 2 positions: in my opinion he found his original position and elasticity. The stove when I did the experiment was at full speed, with a metal temperature of about 50 ° c, you can probably try (having an appropriate oven) with higher temperatures, I think up to 80 ° and you can probably add some thinner to soften and uniform the treatment of the spider. If you have never tried and from what I know, you have many woofers, I hope you try this system to test what I detected. Sorry Tom for my English, I use google translate, I hope I have written in a understandable way.
  7. Giorgio AR

    AR 4xa or AR 6?

    Jank, keep the AR6 as they are and send photos of the woofer of your AR4xa (woofer photographed in front and back). If they are not original you will find a pair of 200001-1 or 200037 that will complete your AR4xa with satisfaction (and little expense if you are patient). Giorgio
  8. Giorgio AR

    AR 4xa or AR 6?

    Ra.ra, wonderful the work of removing black paint and cleaning the frame around the cloth surround, the woofer so take a better look!
  9. Giorgio AR

    AR-2t

    I decided to stay with the 20.00 mF capacitors, welded Jantzen 2 x 10 mF (in one added 0.2 mF) and finish this project. In the photos you can see the capacitors, the measured values, the foam containers, the speakers in order of listening. A resistance will probably be added to reduce the efficiency of small AR1ms value advice (ohms and watts) are welcome Thank you Giorgio
  10. Giorgio AR

    I need AR58b crossover schematic!

    Photo of disassembled capacitors with measured values and photo of crossovers without capacitors
  11. Giorgio AR

    I need AR58b crossover schematic!

    Here are the photos of the AR48b diagram with the modifications to be made to the capacitors and coils (marked by * on the diagram) and the photo of the AR48b crossover with the same changes marked!
  12. Giorgio AR

    I need AR58b crossover schematic!

    Thanks Pete and Ra.ra, I immediately printed and compared the two schemes, I don't have electronic knowledge, but the AR58b scheme is very simple and almost the same as the AR48b. Change the value of the woofer coil from 3.85mH to 2.30mH, the value of 3 capacitors and the value of the resistors (one less in the AR58b) The crossover modification allows the use of the original plate and most of the original AR48b components. The project will be long-running, but now I own all the components (including the white wool which is the internal sound absorbing), and I can adapt the crossover to the 12 "woofer !!! The most demanding job will be the construction of the cabinet, another challenge: my desire is to use a laminated birch wood, or otherwise advice or experience on the use of other types of wood is welcome. I enclose the photo of the AR48b crossover that will be modified in AR58b, thanks to the help of Pete and Ra.ra
  13. I need the schema of AR58b crossover for an AR 12" woofer three-way project. I have a pair of 12 "TNG woofers, the Middle / High section of the AR48b. I want to build a new cabinet for this three-way project and AR components, I have the AR48b speakers crossover (also the schematic crossover). I need the AR58b crossover scheme (not the AR58s scheme that has a midrange dome or advice to adjust crossover for accept the 12 "woofer The cabinet will have the same size and internal reinforcement as the AR3a Speakers of AR58b modified: 12 "TNG woofer 4 "paper like mid 0.75 dome tweeter as AR58b project. I have a pair of 12 "TNG woofers, the Middle / High section of the AR48b. I want to build a new cabinet for this three-way project and AR components, I have the AR48b speakers crossover (also the schematic crossover). I need the AR58b crossover scheme (not the AR58s scheme that has a midrange dome or advice on the AR48b crossover to adjust the 12 "woofer Below the photo of the components. The cabinet will have the same size and internal reinforcement as the AR3a Speakers of AR58b modified: Below, the photo of the components. 12 "TNG woofer 4 "paper like mid 0.75 dome tweeter as AR58b Thank you Giorgio
  14. Giorgio AR

    AR 4xa or AR 6?

    Jank,I think thath all the 8 "classic woofers can sound like spare parts in AR4x, AR4xa, AR6, AR7, AR8s, AR18, AR17 etc. I add photos of various series of my 8 "woofers, in order: AR7 first series (does not include the number, but has a stamp on the magnet 568 730 ?? and is specific for AR7 and AR MST, this woofer has incorrect assembly foam under cone) the last two photos illustrate the back of the woofer. AR4xa first series AR6 first series spare part (200001-1) AR6 second series 200001-1 AR6 first original series (200001-3) In conclusion I would keep both pairs of speakers looking for original and compatible components or spare parts: in any case I would look for the 200001-1 woofers or otherwise a great universal substitute for the 200037 woofer!
  15. Giorgio AR

    AR 4xa or AR 6?

    Tunedguy is correct, just the technical difference between the 8 "AR6 woofer and the AR4xa woofer. Below the photos of the AR6 woofers (first series) and AR4xa (200001-3). Then the photo of an AR6 speaker with the replacement woofer next to it, ric. 200001-1, then you see a pair of AR4xa next to an AR4x and its woofer Finally, overview of four woofers: AR6, 200001-1, pair of AR4x.
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