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Fisher console - would like to modernize with updated speakers/crossovers

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  • #16
    Originally posted by Jaded1776 View Post
    Well I have a few more details. It appears the mid is a Jensen P8R and the tweet is a P35. Based on another photo I found the woofer was probably a P12PL. Armed with those details, would it make sense to try and source the same or similar and just restore the cabinet?
    The problems are: (A) The originals are likely not available; (B) Offers for direct replacement are BS; and (3) Modern drivers are designed for different conditions than those in the 50's / 60's. If you can read the values on the XO caps, they can be replaced. The XO resistors and coils are likely fine. If the existing tweeter and mid work fine, it may be possible to get a modern. equivalent woofer. But you'd need to know the woofer low-pass frequency. A really experienced TT member, with measurement equipment, probably could find a modern replacement woofer and you'd be good-to-go.

    But they couldn't do that via posts. They'd have to have the project "in-hand".

    Providing the interior dimensions of units speaker enclosure and the length and inside diameter the port (long pipe) may elicit some suggestions ....

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    • #17
      Considering the age, wouldn't the cones more than likely be paper and the surrounds foam, or cloth? The tweeter is probably more like a paper whizzer cone tweeter. Even though it appears to have been well taken care of over the decades, I'd have to wonder how well the drivers aged.
      http://techtalk.parts-express.com/fo...khanspires-but
      http://techtalk.parts-express.com/fo...pico-neo-build
      http://techtalk.parts-express.com/fo...ensation-build

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      • #18
        Originally posted by Kornbread View Post
        Considering the age, wouldn't the cones more than likely be paper and the surrounds foam, or cloth? The tweeter is probably more like a paper whizzer cone tweeter. Even though it appears to have been well taken care of over the decades, I'd have to wonder how well the drivers aged.
        If they're like most drivers from that period, the surrounds are also paper, corrugated to make it a bit more flexible. Xmax was generally tiny by today's standards. Often though the spiders will harden and crack, and the Alnico will sometimes lose magnetism.
        Francis

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        • #19
          Isn't that a thing with the ultra-expensive alnico drivers of today; they can lose magnetism under thermal stress?
          Just my $.02, but if that were my console, I'd be looking at some of the grs offerings to replace the oem drivers and upgrading the table. I'd kick the guy in the puds for putting the table almost on the floor. It should have been on top for ease of access. Records are a medium that requires physical activity to enjoy.
          http://techtalk.parts-express.com/fo...khanspires-but
          http://techtalk.parts-express.com/fo...pico-neo-build
          http://techtalk.parts-express.com/fo...ensation-build

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          • #20
            Alnico 5 has a higher gauss than alnico 8 but can lose some magnetism over time. Alnico 8 uses about 5% titanium in the alloy so it holds its magnetism much better. If the mids and tweets are still good I'd just get some nice, used alnico woofers to match their higher spl and a nice 70s receiver. 20-25 wpc would be adequate. Have fun with your project. Beautiful piece of furniture.

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            • #21
              Generally Alnico 5 is demagnetized by abuse, namely too much power to the driver. On an ancient driver I'd worry a lot more about cone rot and the spider cracking.
              Francis

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              • #22
                From my personal experience with hundreds of alnico drivers I've found their highest failure has been smoked voice coils and frozen cones.
                I've had many modern drivers fail from foam rot after a few years. My HSU sub woofers needed new surrounds after about 10 years,The old Pioneer heavy duty woofer line was particularly troublesome from premature foam rot.
                When purchasing any used driver measure the dc resistance and check for smooth cone travel with no scraping. Visually inspect spider, surrounds and terminals. Any corrosion or frame rust would be suspect.
                Some of my older drivers with treated foam surrounds are still fine after 20 years.


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                • #23
                  Why not just gut the insides, build a pair of DIY speakers that will fit inside?

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                  • #24
                    If you're going to listen to LPs on a Garrard record changer and FM radio through an old receiver, maybe old alnico drivers are OK.

                    I think modern sound technology beats old tech, and I think modern sound sources need modern sound reproduction technology.

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