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Giorgio AR

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About Giorgio AR

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    Advanced Member
  • Birthday 12/29/1962

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

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  1. Hi Reza, I paired my AR10PI replica (but I also used AR3 and others ...), as well as AR2ax with all my amps, so starting from 1,7w x 2 tube, amp. up to 325w x 2 of Adcom GFA55 all transistor, all were fine and satisfying in sound quality heard with AR; the only thing that changes is the perceived sound intensity and therefore the Db as pressure reaching the ear: a few watts = splendid sound, many watts = the same sound louder than before, the quality remains the same. At high volumes supported as a peak by the AR speakers, and with Adcom, the watts are many, the sound and listening remain perfect and not annoying to the ear! With tubes I don't reach high sound pressures, but the quality of the sound reproduced by AR improves further, with AR2ax I used my Dynaco ST-70, together with Mind-Da MC7R preamplifier and I think it is a formidable combination (the Ming has changed the sole tubes: 2 x 12AX7 Fivre, 2 x 12AU7 mullard year '58 and 5AR4 Mullard, instead of the Chinese tubes): it becomes a definitive pairing; the same with AR3a, probably with AR10PII double the power of Dynaco ST-70 would be good, so 2 x ST-70 in mono or two monophonic brothers from 70w x ch. they would be perfect.
  2. To add more information on AR coils, I am modifying the crossovers of my AR58S with the replacement of the AR91 / 92 crossover. Apart from the differences already described in another thread, I noticed that in the two crossovers there is a difference in the diameter (therefore also in the number of turns) between the cables of the coils of the 2 crossovers. Those of AR91 / 92 have the classic measure in mm. of about 1.1 mm., while in AR58S, the wire is thinner, with a measured measurement of about 0.95 mm. At the instrumental measurement, the detected values are practically equal and correspond to the AR specifications declared in 0.2 mH. Below the photos of the 2 types of coils and related measurements. AR91/92 Tweeter coil AR58S AR91/92 tweeter coil value AR58S value
  3. Thanks Kent, wood tonearm has always fascinated me, not modern constructions, but as you will have understood the ones that man built long before this strange electronic and consumerist era.
  4. Kent, my reasoning is due to the fact that in this catalog the combinations of these three brands are offered and also the beautiful graphics of the time, supported by the various components enclosed in a stylized triangle: for the time, the user who saw an association between a magnificent amplification, "revolutionary" speakers such as the ARs, a valid tonearm and an equally exclusive pick-up, he would probably have bought the components of this combination ... and probably 55 years later he would still have a high level hifi coordinated level! The AR3 alone combination with Marantz pair, Model 7 plus Model 8 or even Model 9 pair (I have never heard it), I think is great today and probably at the time, 1965 had very few competitors to match. total quality! P.S. I have only seen the Grado tonearm on proprietary turntables from the same era as the Delrama catalog, do you know if it is possible to mount it on the AR turntable without modifying / cutting anything, therefore the replacement is totally reversible?
  5. Dear Tom, to integrate the little information on "Delrama" here is a catalog from 1965, therefore preceding the output of the AR amplifiers, very, very special for two reasons: in addition to AR products, it is combined with Marantz amplifiers, and Grado (probably their tonearm and pick-up upgrade the AR turntable! ), at the end there is also the price list, of which a page only for Grado products. The second peculiarity that suggests that "Delrama" is a large local and international distributor, is the version of the same catalog in Italian with typewriter writing and inaccurate translation! (just like Google Translate often does, which I use too!). The story of how I came into possession of this catalog is also particular: I bought some documentation on Acoustic Research in Germany, by sending a message to the seller I discovered that he was an Italian who immigrated there years ago, which pleased us both. .in a subsequent message he wrote me that by rummaging through his vast paper documentation, he had found other AR "material" and that he would add it for free to what I had acquired, below you the "Delrama" catalog of 1965 for the use of us enthusiasts. First the strange Italian version, note the printing of the characters and small differences compared to the original English version. Catalog in original language Price list Price list Grado
  6. Another AR58s conversion using the AR92 crossover: you got it right, unfortunately I managed to buy a pair of AR92 crossovers! Thanks to all the schematics of our beloved AR speakers published on CSP I am modifying these crossovers to make them identical to the AR91 ones. The 1.37 mH coil (different in the AR92 crossover) comes from the original AR58s crossover, always the same source for the 2ohm and 22w resistor, to also add the missing 40uF capacitor in this board and then wire everything correctly. As a replacement for the capacitors I will use bipolar electrolytics in the sizes of 40uf and 100uf, PIO to replace the remaining capacitors. I am attaching the photo of the provisional test arrangement of a crossover in the AR58s cabinet and a second photo showing one speaker with original mids and tws, the other with mids and tws from AR10 / 11 MK2, to the right of this cabinet is also the AR10 / 11 woofer, in front of this woofer the box containing the NOS CCCP PIO capacitors (the box contains 42 capacitors that I will need to renew the AR78LS and AR2a torque crossovers too) .I have long wanted this modification on the AR58s for being able to attenuate the medium / high range and thus bring it to be more similar to the sound of the AR3a, the cabinet with the AR10 / 11 speakers, when the crossovers are finished and working, will help me to grasp the differences between the two series of woofers, mid. and tw. Like all my projects, the realization will not be in a short time, but I will update the report of the continuation of the work over time! P.S. The coils present in the AR58s and AR92 crossovers have the thick 18ga cable if I'm not mistaken, but the two small .2mH coils, despite having the same values in both crossovers, in that of AR58s, the wire is much thinner! As soon as I can I will publish the photos to see the differences with the diameter measurements in mm. of the wires.
  7. Great Aadams, this document is a great gift from you and Roy!
  8. Hello, I have a correct '74 200003 woofer, already refoamed with the right foam (AR Vintage the provenance), I don't care about the replacement Tonegen woofer of your AR3a improved and I'm not convinced to sell it! It depends on how much you are willing to spend. Below the photo of the woofer in its AR3a cabinet
  9. Frank here is my pair of AR LSTs, resting on top of AR3a and AR10PII replica, alongside AR78LS. Thank you for giving me the input to position the AR LSTs up and upside down (I am fully satisfied with the cleanliness and sharpness of the whole range, the low range is very good, certainly the woofer below the AR3a does better) I do not have your complete Audio set nor for now the right amplification for the 4 pairs of 12 "AR at the moment all McIntosh amps. Giorgio
  10. In my direct experience, that type of glue (the speakers should be the series assembled in England or Holland) was also on my AR3a imp. and on pair of AR18 it is almost impossible to remove without ruining the hidden components. In my case with considerable difficulty I had removed only the one that blocked the capacitors to be replaced and discovering the wires (as well as fine removal of the residues with strong thinner) in order to then be able to weld the new capacitors correctly. The glue used in the speakers made in the USA is much easier to remove and used in smaller quantities! I am attaching the photos of an AR3a crossover imp. before and after replacing capacitors (in the other speaker I have not replaced a 10uF capacitor, it was impossible to isolate the wire to solder the new one !!) I also have a switch from AR18 (England), removed from the masonite, not even here with the piece in my hands did I manage to remove the glue from the switch body itself, this penetrated the plastic of the switch ...
  11. Hello Brian, try this: https://www.ebay.it/itm/324155784808 It is an example, better to find a matched pair, it is not expensive, with little difficulty you can replace your non-working tweeters (it also happened to me with an AR78LS tweeter: the wire between the contact and the course on the magnet is interrupted by corrosion!), and you will be able to recover some of the money spent by reselling the mid. or all the rest. If you don't feel able to replace, there is a member who has this ability, Chris1this tries to contact him!
  12. Ra.ra, I confirm the switch with a plastic lever and also the 90 ° rotation of the crossover panel. The rear-wired tweeters have the same diameter magnet as the previous ones, subsequently they got the denomination 200005. Between the three couples, there are differences in the grilles frames (in the older couple the frame is in wooden strips, the other two have a masonite frame with different cut) and in the linen texture.
  13. Ra.ra below you can find photos of the third pair of AR7, recently purchased, is the second assembled in Holland, completely original and untouched, unlike the two previous couples it is a late model with vinyl coating (the other 2 couples are covered in wood ), this one as well as the others has consecutive numbers on the labels. The last photo shows the three AR7s together.
  14. Ra.ra, you are always helpful in your posts, today I finished and closed after the repairs of the cabinet and replacement of the capacitors (in the older AR4x pair a woofer still has small leaks in the seal, tomorrow even this small problem will be fixed ) both pairs. I checked my photographic archive and I attach the labels of the second pair of ar7, in which the letter H is written correctly, from a survey with my family, it should be an M prefix, I hope that over time they will be found other testimonies on the existence of this prefix (as previously written, from certain news, AR speakers were assembled in Italy in the 70s as well). In the attached thread I add the photos of my recent acquisition of the third pair of AR7!
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