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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. BA T1000's AND T1030's

    I updated the schematic with corrections.
  2. Blown New Advent driver

    I just looked on ebay and found a Jensen woofer (round magnet) with a fabric dust cap, seems that there are many combinations of parts. Round magnet with a Jensen part number seems to be the definitive way to check. All OLA and NLA woofers that I've ever seen had square magnets.
  3. Blown New Advent driver

    Early versions of the Jensen 5002/12 used the Advent made NLA woofer which has the all steel frame, fabric looking dust cap, and a square magnet. I'd guess that when they ran out they built their own woofer, from the front the only difference is that the dust cap is paper. From the back it is obvious because they have a round magnet and a bumped back plate. The motor design is somewhat different but the cone and in general they seem to be the same. I'd either get two new round magnet woofers, or get what most people would call a New Large Advent woofer since it looks like that is what you already have.
  4. Bi Amping the AR9 - How do you do it?

    Frank, I wonder if the Phase Linear amps do not like the load of just the top or bottom of the AR9's. Hate to see another or newly rebuilt amp fail again.
  5. Greetings Pete!
    Saw your picture of restored Dynacos.
    I have now Dynaco A25, Scandyna A25X and Scandyna A45X, all of them need to be restored.
    Wanna ask you - how you treated rubber surrounding to get it looks new and shiny?

    1. Pete B

      Pete B

      That was a big mistake on my part, I used WD40 and later learned that it has a very 

      strong solvent in it.  I don't use it anymore for speaker edges.

      Wish I had a better answer.

    2. Raccoon


      By advice of one really skillful and old speaker driver restoration specialist i use ... acetone! And it works just great!
      Can advice it to any rbuber surrounding!


    3. Pete B

      Pete B

      Why, just to clean it?  We are fairly certain that a few types of rubber have been used for edges

      and I'm not certain that Acetone is safe for all types.

  6. Advent/1 vs New Large Advents

    I have a pair of Advent/1's and NLA's and I was quite surprised by how little the /1 gives up in bass extension. I've not compared them side by side but the /1's are surprisingly good, one of my favorites. I hope that you compare yours side by side and let us know.
  7. M-907 to be restored

    Never heard of the White Oak upgrade, do you have a schematic for it?
  8. Wife needs help finishing his bucket list AR92s

    Nice work and to see them finished and that you didn't part them out!
  9. What's the impedance on the Advent/1?

    NLAs in the Extended position dip to 3.16 ohms at about 6.5 KHz. I don't recall if the Advent/1 is voiced as the NLA in the Normal or Decrease position where the dip is not as bad, 4.13 ohms Normal, and 5.5 Decrease: These are all far lower than 8 ohms. They called them 8 ohm speakers for marketing reasons. Imagine a stacked pair wired in parallel on Extended with a dip well below 2 ohms.
  10. Carl Richard (Carlspeak) RIP 11-11-2017

    That is Carl's thread there, but the design went through many very different iterations. The idea was a kit of parts including all the drivers and crossover parts, build your own boxes or buy prefab and cut out for the drivers. He had a CNC shop do the driver cut outs.
  11. Carl Richard (Carlspeak) RIP 11-11-2017

    I've contacted Madisound to inform them of Carl's passing and suggested that they might want to reconsider offering his Intimate speakers (Madisound showed them at RMAF) as a kit. Also informed the AES.
  12. AR9 Teledyn Big LF Caps where?

    Electrolytic caps use very thin foil so that a lot of area can be packed into a small volume, this thin foil has fairly high resistance per inch. Normal electrolytics have a single attachment point for the connection terminals. The large can caps have many attachment points in order to reduce the resistance (ESR) and inductance (ESL) caused by the foil. We should try to compute the ESR of the group of caps at the important frequency. The 2500 uF resonates at about 28 Hz and we'd like the ESR to be (much) lower than the DC resistance of the inductor or roughly equal to the original cap. The 470 uF should have low ESR around 200 Hz where it is working in the crossover. Let me see if I can find some data on large can caps from that era.
  13. I'm afraid it has happened?

    I agree Tom, the upper chamber under the dome is vented, through the three slots to the air chamber where the back of the voice coil is.
  14. I'm afraid it has happened?

    Thanks Roy, yes I also had the other one of the pair apart some time after I made those measurements and saw those features.
  15. Capacitors Redux

    I measured a Collins cap here back in 2005, it was defective before reforming it: http://www.classicspeakerpages.net/IP.Board/index.php?/topic/1411-ar-11-collins-capacitance-increase-needs-reforming/