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giovanni56

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Everything posted by giovanni56

  1. giovanni56
    If you have Ar3a's, I don't understand the reason to build a new crossover filter, the Ar3a's sound good with the filter that Ar came up with, it doesn't make any sense to change it, especially in the way you outlined.
  2. giovanni56
    But which speakers are you going to install those tweeters in?
  3. giovanni56
    The coil is used to increase the attenuation slope of frequencies below the Fc of the tweeter's high-pass filter to avoid "breaking" the component
  4. giovanni56
    MidWest MT 4121-4 4ohm. Ar3a, Ar3aMigliorato, Ar11, Ar10pigreco, Ar LST MidWest MT 4121-8 8ohm Ar5, Ar2ax, Ar LST2. On Ar3a and ArLST the filter must be modified by adding an inductance of 0,105 mH in parallel to the tweeter that must be connected with inverse polarity, same thing for the 8 ohm tweeter on Ar2ax, Ar5 and Ar LST2, but with inductance of different value 0,15 mH.
  5. giovanni56
    I think the 8ohm constant impedance L-Pads, need to be replaced on both mid and tweeter, the 4nF capacitor for proper high pass operation needs to see the original 16 ohm rheostat load and the tweeter load 8 ohms as originally (same thing on the midrange).
  6. giovanni56
    The Ar2ax do not come with black knobs, but with an arrow engraved on the potentiometer shaft. If the potentiometer is fixed in place with the socket in the masonite, to make the measurement you put the dart on the white dot and measure the R between B and 1 of the rheostat. It should be 6 ohms for the midrange and 4 ohms for the tweeter.
  7. giovanni56
    The tweeters are always better to be in pairs, then given the age, it would be necessary to disassemble them both, arrange them, check them to align as much as possible the T&S parameters
  8. giovanni56
    There are audio experts who claim treated paper as one of the best materials for the construction of speakers (woofers, midrange and tweeters); the problem is the cost of production of good paper membranes, for example on woofers is cheaper and more repeatable, build a metal cone than a cone in treated paper.
  9. giovanni56
    Mr. Allison designed his tweeters and midranges with the goal of the greatest possible off-axis dispersion, and the domes were made of stiff paper. I think he would not choose either Ar tweeter, but would reuse his own. For a new design with modern drivers, perhaps he would consider using the Dynaudio D21AF, Vifa DT19 or Scanspeak D2010 as tweeters and the Dynaudio D52AF or D54AF, or Scanspeak D3806 as midrange.
  10. giovanni56
    I have a feeling the 3.2 ohm tweeter has already been repaired, the 1.1 ohm tweeter has a shorted coil. They can be restored, but it's an awfully "heavy" job, among other things it takes a lot of time
  11. giovanni56
    Grazie, Giorgio, buon ferragosto!
  12. giovanni56
    I don't know, however these are made in the USA but have the same carryover on the edge
  13. giovanni56
    If you lived in Italy, I could have rebuilt them.
  14. giovanni56
    C'è solo un'etichetta accanto ai morsetti di connessione, nella porta non ci sono etichette. All'interno delle custodie ci sono due etichette spartane che riportano gli stessi numeri di serie di quelle esterne. 1089 1293
  15. giovanni56
    These are my Ar10pi
  16. giovanni56
    Giorgio, the woofer 200003 used in Ar3a is ok for LST, but also the more recent one used in Ar10p/Ar11 with the white on black logo. The TNG is equally good, I have measured several of them and the differences are really minimal, if you adjust the Qtc of the speaker by changing the amount of glass wool, the bass of the TNG is practically, equivalent to that of its American cousin. The TNG can handle a little more power and is less prone to bottom out.
  17. giovanni56
    No it's not weird, on the last LST Ar manufactured Ar used those resistors as well. I found one that was faulty.
  18. giovanni56
    Did you measure the Re of the tweeters? what value did you. read?
  19. giovanni56
    These LSTs are among the last ones produced, they do not have midrange and tweeter with external wiring, those oval things close the holes of the external terminals. The original tweeters have been replaced with 200011-1, the crossover network has been modified by inserting a high-pass inductance of adequate value and the tweeter connection is in antiphase with respect to the midrange and woofer.
  20. giovanni56
    After restoring this pair of Ar LST, I did some checks and to my great surprise, I found broken the 10 Ohm 10W resistor in parallel to the 2500 nF C and the fuse holders with a very high contact resistance value. I decided to remove the fuse holders and replace the faulty R; I wonder what could have been the cause of this breakage that I hypothesize could occur if the 2500 nF C was interrupted leaving all the power of the amplifier to pass on the resistor. Does anyone have experience with this? thank you.
  21. giovanni56
    Sostituzione obbligatoria dei condensatori, questi Callin sono tutti fuori tolleranza.
  22. giovanni56
    Si tratta di una coppia di Ar LST a cui hanno sostituito tutti i tweeter Ar 200013-1 con AR / TNG 1200011-1 e il woofer Ar 200003, con Ar / TNG 1200003-AB dell'Ar3a Replica, quindi il filtro passa alto deve essere modificato; i midrange sono originali. Intendevo eliminare l'autotrasformatore ma non sono del tutto convinto.
  23. giovanni56
  24. giovanni56
    My collection of Ar
  25. giovanni56
    Have you checked to see if the filters in the two cases have identical component values
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