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Pete B

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About Pete B

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

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  1. Recapping the bass section of the AR9

    I was joking in return but any NPE that old needs to be replaced anyway.
  2. Recapping the bass section of the AR9

    Looks like it needs to be replaced.
  3. Smaller Advent woofer

    On cap testers, see the examples toward the end:
  4. I am quite certain that the only thing built by Nak in these KLH tape units were the boards. I believe that Henry was not very good at designing tape decks. Nak made some outstanding decks, I had a BX300 that worked perfectly for 10 years or so.
  5. Anyone know more about or own the KLH Model 40 reel to reel? My brother and I each bought one of these surplus from Burstein-Applebee back in probably the 1960s without the electronics. We used them for playback only with the head wired straight into the Dyna PAT 4 tape input. They were so unreliable that I thought it was why they ended up at a surplus house. Found this online: http://www.tapeheads.net/showthread.php?t=21163 OP writes: "I've owned this KLH Model 40 Series 2 since I bought it new at Musicraft back when I worked there. These were built in house at KLH but was told the electronics boards with Dolby B were made by Nak for KLH. This was the first consumer reel to reel to sport Dolby B. It is a 3 motor, 3 head 2 speed deck. This was one of the best sounding reel to reels I ever owned. Also one of the least reliable. These had so many failures that KLH bought many of them back. I was offered a storage unit full of them by the KLH rep at one time but I lived in a small apt then and had no place to put them. I imagine they all went to the landfill as they probably would have shown up on Fleabay by now if someone else got them. Mine has seen a hard life as it was in my rental house in Petersburg when Isabel flooded it and it was totally submerged. Its now sort of in "kit" form as I took it all apart to help dry it out.It has low hours as I gave up on it after about 100 hours of use when it was new. These had problems with the transport switches arching. They were just springy leaf switches and would fail often. It also use cheap ass open frame relays that would flake out constantly. The plastic parts like the knobs were brittle and broke. The speed change belt was to wimpy and would break and the capstan belts turned to goo. Otherwise fine machines . Its a shame because they sounded fantastic when they worked. On the plus side they had a very heavy duty head block. I am now evaluating whether I want to try and make it work again and maybe re-engineer some of the original problems as it will need to be completely disassembled anyways. Will likely need all new electrolytic caps, new knobs etc. Its rough but not as bad as I thought it would be from being under water.It's gonna be a real labor of love (or insanity ) to get this beast to ever emit anything but smoke ever again I'm sure."
  6. The enclosure is a folded transmission line with and odd tapered port, and there was an article about them in Popular Electronics back in the 1960s and 70s. The inventor paid a math guy to do the analysis and I scanned it for a few people on the net, I believe that it is out there somewhere: http://www.cameng.com/pdf/the_k-coupler_a_new_acoustical-impedance_transformer.pdf I would try the box with a modern woofer for bass only, with a tweeter sitting on top and see what you think. If you Google Karlson K-coupler you will find many pages about them on DIYaudio and many other sites.
  7. Some Stromberg Carlson info from the 1930s, I shared some of the more technical papers years ago online but I'm not sure if they are still up: http://www.antiqueradio.com/Sep06_Schecter_Choose.html This is what Bose has perfected and re-marketed as the Acoustic Wave products and Wave Cannon. I did project work on Acoustic Transmission Lines as a senior project in college and interviewed with Bose suggesting that they look into them.
  8. That is very cool, you might find out that they produce deep, powerful bass. I can give you some tips if they need some fine tuning. Plan to re-cap them, they will certainly need it.
  9. Do you know the time frame for these? Stromberg Carlson essentially invented what we call today transmission line speakers but they called them an acoustical labyrinth. Is there a folded pipe inside the box, and a port out the back or bottom?
  10. AR 11" Woofer Cone Material ?

    Dunkin Donuts cup trays look to be the same material and are also grey so I'll probably use one.
  11. EPI 100 woofer relocation suggestion

    The EPI woofers have about 1/4" linear throw in each direction but when driven very hard will hit at least 3/8" in each direction so that probably explains the set back. This is based on a .75" long coil in a .25" gap providing .25" on either side outside of the gap. Overdrive it to 3/8" and there are half as many windings in the gap but the motor still has power. I seem to remember reading in the AES that the air mass in the opening acts as a low pass filter on the woofer. I think it was with regard to the AR-2 series. If it were a simple mass it would just slightly increase the effective moving mass of the woofer cone, but there may be more to it than just a simple mass.
  12. AR 11" Woofer Cone Material ?

    Thanks Mike, Yes, I agree now that you mention it, I think we have a grey carton at home now that is good enough. I'll probably use some PVA glue to make the repair - other suggestions?
  13. T-1030 vs. VR 40

    Mind if I ask Steve, what speaker was at the top of the list that you were associated with?
  14. BA T1000's AND T1030's

    Very curious to see the T1030 schematic if anyone has it.