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Pete B

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About Pete B

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    Advanced Member

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    Connecticut, NE USA
  • Interests
    Interest in Audio for over 30 years, got started early
    Electrical Engineer (see my web site link)

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  1. AR3 capacitor drift

    Tom Tyson wrote back in 2004: "You raise an interesting point regarding the capacitor changes in the AR-3a from the early (1967-1972) to the later versions (1973-1975). The first-generation AR-3as did indeed use the Industrial Condenser Corp paper capacitors up to about 1972; the later-generation AR-3as used Callins or Sprague Compulytic electrolytic capacitors (50 to 60 V). The second generation AR-3a (not including, in this instance, the AR-3a "Improved" version which was a European model) was indeed changed in several important respects: (1) the crossover frequencies" From: http://www.classicspeakerpages.net/IP.Board/index.php?/topic/953-speaker-voicing-and-capacitor-types-used/ I search this forum from google rather than using the internal search feature.
  2. The Electronic Subwoofer

    The excursion requirements go way up with EQ like this, when pushed of course. This is expecially bad for small speakers, perhaps just use it at low listening levels. Just about everything on EQ: http://www.roger-russell.com/equalizers/equalizers.htm
  3. No. Consider the volume displacement, piston area times Xmax.
  4. AR3 capacitor drift

    My measurement system plots impedance vs. frequency 10 Hz to 20 KHz and the cursor can be placed at any point on the graph providing capacitance and ESR. The free software Arta should be able to do the same thing with a laptop and some custom cables with clip ends. Just looked this up, you'd use the associated LIMP program: http://www.artalabs.hr/ It tests at low voltage and it is important to know if there is leakage at the rated voltage for an old cap, simplest thing is to just replace them at least to the fragile dome drivers.
  5. AR3 capacitor drift

    I have posted this before, note his comments on measuring leakage, and important comments toward the end:
  6. AR3 capacitor drift

    There are even meters that charge the cap with a constant current and measure the time constant, which would be a very low frequency measurement, not even putting AC on the cap.
  7. Woofers are sold for use in a pair of AR-5's, local sale, easy, good to see them go for a good use.
  8. AR3 capacitor drift

    Check for leakage on the Meg ohm scale, what do you find? Isn't that a paper cap and not NPE?
  9. Trivia questions, anyone know what 1991 model these woofer are from? They measure 6" across the small frame dimension. Edit: Are they from the SubSat 6?
  10. I've read that the 2ax 3/4" tweeter IS correct but I have front wired tweeters and the AR-5 that they might go into is rear wired, anyone have pictures/diagrams on the best way to adapt them?
  11. I know that obviously the 2ax mids are not right in the 5, but are the 3/4" tweeters correct? @RoyC ?
  12. I was recently messaged on AudioKarma by a person who says they've been unable to join this forum for 2 years, and I've read about others having similar problems. Does anyone know why this happens and how to correct the issue? What email address should they mail to ask for assistance and what info should they provide?
  13. I've been asked if these would be "right" in an AR-5, anyone know? Did the 5 ever ship with these foam edge, ALNICO woofers? Edit: Roy_c wrote this over at AK so it seems that they are correct and the ones most commonly used: "rusomon is correct...The woofer with the dome is the first woofer used in the AR-5. The other is the second (and most common woofer), which was shared with the AR-2ax. It is possible the original woofer was replaced with the 2ax version, or you have a transitional specimen. (AR did not sell speakers to retailers as pairs.) The AR-5 was the first AR model to use a woofer with a foam surround.There were just over 100,000 AR-3a's manufactured in the US, and nearly 50,000 AR-5's. The tweeters and mids appear the same, but the AR-5 has 8 ohm drivers, and the AR-3a drivers are 4 ohm. The crossovers design are the same, but the crossover component values differ.Both versions of the woofer have alnico magnets. I believe the earlier woofer had a slightly larger magnet, and a slightly longer excursion. There should not, however, be a significant difference in sound between the two woofers. Very late production AR-5's and 2ax's were equipped with ceramic magnet versions of the woofer.Roy"
  14. OK Rob sounds good. Did you get an answer from Roy about servicing that woofer?
  15. I started to write this to offer the woofers out of these speakers to a few members who are looking for them. But I might as well offer the rest of the systems. I have a pair that had very beat up cabinets that the previous owner started to prime for paint. I took it further sanding the grain smooth and doing quite a few layers of primer to get them ready for paint. They are not fully ready since you have to sand and fill any issues but they are close. I did this work probably 10 years ago just to salvage them. All the drivers worked fine when I tested them 10 years ago, and I did not recap them at the time. I refoamed them at that time with the correct foam from a good supplier, I think it was Simply Speakers. I'll sell them whole or part them out. One member needed woofers and mids so that seems like a good match, or is there anyone who wants the entire speakers to finish them? The woofers are 4 bolt stamped frame foam edge with soft cones and ALNICO magnets. Offers for parts or the entire project? More pics to come. Pete B.