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Doug G.

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About Doug G.

  • Birthday 10/02/1952

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    Austin, MN
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    HiFi, Quadraphonics, Model Trains.

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  1. By "all-metal woofer", I mean without the Masonite ring of the earlier ones. Doug
  2. OK, if they are New Advents, they would normally have the all-metal woofers. Doug
  3. Frank, did/do your Advents look like the picture in this thread, other than the woofers being all-metal ones - no Masonite? In other words, are they original Advents and not New Advents? I ask because, if you bought them in 1978 and they are original Advents and have all metal woofers, that reinforces the theory that Advent used the all-metal woofers on the very late original Advents, since 1977-78 is when they started selling the new Advents. Original Advents have tweeters like those in the picture, whereas New Advents have tweeters that have no Masonite square and mount flush to the speaker board (baffle). Doug
  4. Both the original Advents and New Advents were available in wood veneer and vinyl "utility" versions. The original Advent wood veneer cabinets had beveled trim on the front and the New Advent wood veneer cabinets had rounded trim, called "bullnose" trim on the front. The vinyl cabinets were pretty much identical between the two models with minor dimension variation. The grille cloth on the new Advents was a slightly "browner" color. The ones in your picture are original Advent Utility versions. BTW, it's hard to tell from the picture whether the tweeter cones are orange or green. If they are green, they are from sometime in later 1975. On closer viewing, they appear that they are probably orange but still not really clear. The shades of orange varied from a rather bright, reddish orange to an almost brownish orange. In any case, that pair is from 1975 or later because the black tape across the front of the Masonite on the tweeters only goes part way across. Doug
  5. Doug G.

    OLA refurb

    I thought the woofers are always the same but they changed the tweeter to use the same, larger magnet version and made a crossover change to match the efficiencies of the tweeter and woofer in the Smaller Advents. Doug
  6. Is the foam covering the baffle closed cell or open? I assume closed but you never know. Doug
  7. Doug G.

    OLA refurb

    Hi Roy, When I reread some of my posts, I realize they come off as maybe being disparaging to other methods which is not my intention. I'm just relating my experiences. I agree that if there IS doubt, it is better to shim. I just have a tendency to want to maintain originality when possible. I do want to mention I have been at speaker repair for many years, also. I remember repairing little 4" and 5"X 7" speakers in the sixties when I was a kid when, for one reason or another, the cone warped or tore or whatever. So, I am not writing from a neophyte perspective. Doug
  8. Doug G.

    OLA refurb

    Well, as I have written quite a few times before, the VC is already centered at the spider in the typical driver unless there is a problem with the spider which is rare. The only thing that needs to be done is to ensure the VC stays parallel to the magnet/pole piece, all along its length, during the refoam and this is easily accomplished by pushing down along the perimeter of the cone all the way around as the glue sets. This guarantees the cone is parallel to the pole piece because pushing on the perimeter, all the way around, slightly biases the VC into a "slanted" position and it would rub on the pole piece if not parallel/centered. I have done it this way during my whole long-time experience with refoaming drivers and have never had a failure. The procedure doesn't have to way more complex than it need be. The tone thing is even unnecessary. Doug
  9. Nope. Take them out and see what it says on the back of the magnets, if anything. Somebody made those black adapters to make them fit in the openings. Hopefully, they didn't alter the original openings so genuine replacements can be dropped in. I would estimate those to have been made in late 1974 or early 1975. Any dates on the tweeters? Doug
  10. I have never heard any real difference between my Advents with fiberglass and my Advents with foam and I just don't think Advent would have made a change which resulted in such a drastic difference in their sound. Doug
  11. Doug G.

    OLA refurb

    Over many refoams, I have never shimmed the VC. Recones, yes, you have to but refoams, no. Doug
  12. The foam does actually seal the tweeter to the board to keep the cabinet air tight. Is there a Hobby Lobby or similar store near you? I bet they would have something like that foam. It is different from the typical foam used for cushions and the like, as you found. Any kind of 1/8", or so, foam or other flexible material would work, although I understand wanting to keep the appearance original. I know I have seen that foam elsewhere but who knows where it was. On the very early Advents, they used Mortite to seal the tweeters, just like the woofers. but it wasn't long before they switched to the foam. Doug
  13. As far as the lighter grille fabric, Advents were originally quite a bit lighter than the examples we see today which have darkened, some of them badly, depending on the environment. My very early pair I bought from a guy originally from Cambridge whose parents bought them from the factory, had grilles beyond redemption, as badly as I wanted to resurrect them. They were actually yellow. Doug
  14. If you get tweeters other than originals, you will most likely have to dink around with a crossover change. Of course, if you like doing that kind of thing... Doug
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