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Thread: Broken driver

  1. #11
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 24,690
    I'm Geoff.

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    Alan is right. It's worth a look.

    The sealed back cup looks removable. It could just be a dodgy soldered joint inside or a defective lead out wire from the coil.
    Mr. Tact!

    Main system: MMs/ADCs/Low output MC's/One rare Japanese SUT/One scarce British phono stage/various tonearms/hefty Japanese DD TT and hefty Japanese BD TT and small British BD TT. 4 CD players/2 jitter buster/2 DACs/Valve buffer. TVC stepped attenuator or valve pre-amp or solid state pre-amp. Current dumping power-amp or either of two Class A SS power-amp or Class A EL34 valve monos or big Japanese (part Class A) integrated. Big dual concentric speakers/Smaller dual concentric speakers/Two way British compacts and full range speakers, amongst others. And too much more to list!

  2. #12
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 24,690
    I'm Geoff.

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    Talking of broken drivers. Here are the tweeters from the same Pioneer speakers.



    They are decidedly 'not well'. The foam surrounds have hardened and crumbled, so Oliver sent them to me to see if I could do anything with them.

    First things first. Measure up and cut foam rings of the correct size.



    Rings bonded to cones and the outer edge taped to the chassis edge to keep them concentric whilst the adhesive dries.



    Outer surround edges bonded to chassis flange .



    The stiff card trim rings bonded back in place and the chassis flange cleaned up. Job done. They work fine and still measure as they did.



    They can rest for a day to allow the adhesive to fully harden, then go back to Oliver.
    Mr. Tact!

    Main system: MMs/ADCs/Low output MC's/One rare Japanese SUT/One scarce British phono stage/various tonearms/hefty Japanese DD TT and hefty Japanese BD TT and small British BD TT. 4 CD players/2 jitter buster/2 DACs/Valve buffer. TVC stepped attenuator or valve pre-amp or solid state pre-amp. Current dumping power-amp or either of two Class A SS power-amp or Class A EL34 valve monos or big Japanese (part Class A) integrated. Big dual concentric speakers/Smaller dual concentric speakers/Two way British compacts and full range speakers, amongst others. And too much more to list!

  3. #13
    Join Date: Mar 2008

    Location: Dunfermline, Scotland, UK

    Posts: 12,092
    I'm inthescottishmafia.

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    Nice job Geoff.
    There are times when you canít do the sensible thing, when you canít act like a responsible adult at all; you just have to do whatever insane thing comes into your head. When bad people do it they end up murderers, when good people do it they end up heroes, and when the rest of us do it we end up looking like total idiots. But whenís that ever stopped us?

  4. #14
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 3,383
    I'm Alan.

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    Top notch Geoff, pity I couldn't fix the mid that was open circuit.

    There was a very small discolouration of one of the lead out wires, turned out to be a spot of corrosion that had eaten the wire away.
    Try as I might I couldn't re-connect to the very short and thin stub of wire remaining.

  5. #15
    Join Date: May 2016

    Location: Much Wenlock

    Posts: 283
    I'm Gary.

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    Quote Originally Posted by Firebottle View Post
    What are you like? Let me have a look at it Oliver, it may not be terminal.

    Any news on poor Oliver's speaker?

  6. #16
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 3,383
    I'm Alan.

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    Posted at the same time Gary. Terminal on the open circuit one. Oliver has ordered some more.

  7. #17
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 2,200
    I'm Oliver.

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    Quote Originally Posted by walpurgis View Post
    Talking of broken drivers. Here are the tweeters from the same Pioneer speakers.



    They are decidedly 'not well'. The foam surrounds have hardened and crumbled, so Oliver sent them to me to see if I could do anything with them.

    First things first. Measure up and cut foam rings of the correct size.



    Rings bonded to cones and the outer edge taped to the chassis edge to keep them concentric whilst the adhesive dries.



    Outer surround edges bonded to chassis flange .



    The stiff card trim rings bonded back in place and the chassis flange cleaned up. Job done. They work fine and still measure as they did.



    They can rest for a day to allow the adhesive to fully harden, then go back to Oliver.
    Wow! They look great. Thanks Geoff.

    I was concerned they had been beyond help but I needed have worried !

    In other driver related news, alan spent some time trying to fix the mid driver but to no avail.a perished wire from the voice coil to the speaker just kept breaking away. A replacement has been ordered from the USA (£55) so should land at the end of the month. Just enough time to get the Caps etc checked I think and maybe give the Cabs a good clean up.

    Its turning into a proper project lol

    Thanks Geoff, you're the man.

    Sent from my EVA-L09 using Tapatalk
    Mission 774 OG Tonearm > Toshiba SR 370 Turntable > ZYX R50 Bloom cartridge > Firebottle OTP Phono Stage > Firebottle Monoblocks > IXOS Speaker Cables > Pioneer CS-77A Speakers

  8. #18
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 24,690
    I'm Geoff.

    Default

    Quote Originally Posted by Bigman80 View Post
    Its turning into a proper project lol
    Looks that way.

    Bet you wish you'd never started!
    Mr. Tact!

    Main system: MMs/ADCs/Low output MC's/One rare Japanese SUT/One scarce British phono stage/various tonearms/hefty Japanese DD TT and hefty Japanese BD TT and small British BD TT. 4 CD players/2 jitter buster/2 DACs/Valve buffer. TVC stepped attenuator or valve pre-amp or solid state pre-amp. Current dumping power-amp or either of two Class A SS power-amp or Class A EL34 valve monos or big Japanese (part Class A) integrated. Big dual concentric speakers/Smaller dual concentric speakers/Two way British compacts and full range speakers, amongst others. And too much more to list!

  9. #19
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 24,690
    I'm Geoff.

    Default

    Quote Originally Posted by Firebottle View Post
    Try as I might I couldn't re-connect to the very short and thin stub of wire remaining.
    Don't chuck it out though. I might have an idea for a fix.
    Mr. Tact!

    Main system: MMs/ADCs/Low output MC's/One rare Japanese SUT/One scarce British phono stage/various tonearms/hefty Japanese DD TT and hefty Japanese BD TT and small British BD TT. 4 CD players/2 jitter buster/2 DACs/Valve buffer. TVC stepped attenuator or valve pre-amp or solid state pre-amp. Current dumping power-amp or either of two Class A SS power-amp or Class A EL34 valve monos or big Japanese (part Class A) integrated. Big dual concentric speakers/Smaller dual concentric speakers/Two way British compacts and full range speakers, amongst others. And too much more to list!

  10. #20
    Join Date: Jul 2009

    Location: Hampshire, UK

    Posts: 1,835
    I'm Buriedunderaloadofturntables.

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    To the OP - just a small point. Your pictures show you testing the drivers with your meter on the diode test setting - you'll get better results on the Ohms measurement range.
    Adam.

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