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    Infinity 2000A

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    timsst70

    Posts : 7
    Join date : 2015-11-03

    Infinity 2000A

    Post by timsst70 on Tue Aug 09, 2016 9:48 pm

    Hi All,

    Just acquired a set of vintage Infinity 2000A speakers, on one an electrostatic element was missing and all of the other electrostatic speakers are not producing sound. Mid and woofer sound fine. The other speaker is working on all elements and speakers. Opened the dead one and evidence of overheating in crossover is clear, the .19 MH coil is fried. I want to rehab it and need input, any suggestions welcome. If this is the wrong forum to post let me know. I intend to drive them with my VTA ST70 rig.

    Tim

    tubes4hifi
    Admin

    Posts : 1261
    Join date : 2008-11-30

    Re: Infinity 2000A

    Post by tubes4hifi on Thu Aug 11, 2016 12:36 pm

    Parts-Express and Madisound are both excellent sources of speaker parts

    timsst70

    Posts : 7
    Join date : 2015-11-03

    Re: Infinity 2000A

    Post by timsst70 on Thu Aug 11, 2016 2:36 pm

    Hi,

    Thanks, I've contacted Madisound and the have recommended a replacement part.

    Tim

    pigface

    Posts : 70
    Join date : 2011-04-10
    Location : pittsburgh

    Re: Infinity 2000A

    Post by pigface on Thu Aug 11, 2016 7:47 pm

    You might have to use a .18mh or a .20mh in place  since it dosen't seem anyone makes a .19mh  coil ? Maybe Infinity had them made specificly  for their own speakers .
    You probly want to check the capacitors out too since they are what 35 + years old ? They do go bad .
    If you are going to keep them maybe just refresh  both crossovers .
    I had to recap both my Infinity kappa 9 crossovers , there were four bad caps on each of my x overs . All on the tweets .

    timsst70

    Posts : 7
    Join date : 2015-11-03

    Re: Infinity 2000A

    Post by timsst70 on Thu Aug 11, 2016 8:40 pm

    Great, I'll plan on rebuilding the crossovers, How did you determine the caps were bad? What type did you choose for replacements?


    pigface

    Posts : 70
    Join date : 2011-04-10
    Location : pittsburgh

    Re: Infinity 2000A

    Post by pigface on Thu Aug 11, 2016 10:14 pm

    I unsoldered one end of the cap and tested it with a multi meter with a capacitance tester . I used solen   on some  , ( they were on the crossover from the factory)  and Erse .  There a lot of different brands you could use in them .
      you should probably check the remaining tweeters First to see if they are good  , I guess it will be very difficult to find a replacement for them . Some Infinity's had complicated crossovers in them . And used  odd speaker drivers that are very hard to find now , basicly used is the only source.

    They were the first crossovers I  ever repaired , so with some research  you should be able to get these working  again too.

    check this for some more info  a good infinity source .  :  http://www.infinity-classics.de/models/Electrostatic-series-since-1968/2000A/body_2000a.html

    GP49

    Posts : 717
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

    Re: Infinity 2000A

    Post by GP49 on Fri Aug 12, 2016 3:45 am

    The electrostatic screens in the Infinity 2000a were made by RTR To a JansZen design. They are virtually unobtainable now except by cannibalizing other examples. Too bad...they were and still are an excellent tweeter if in working condition. They did suffer from oxidation of the conductive membrane used as their diaphragms over time, reducing their output and sometimes rendering them silent...and a lot of time has passed since they were made.

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