Sven Dowideit Posted January 12, 2021 Share Posted January 12, 2021 So I've finally made room to set these up (they're my Dad's - original owner), and it seems that the one midrange is definitely not making any sound. All my toys are packed away somewhere, so I've not had a multi-meter on it, but when I connect another speaker to the leads going to it (using aligator clips), that speaker does make sound... Just as frustratingly, the other midrange, works, but was someone fell into it over the years - is there a safe-ish way to pull the dome back out? Does anyone have any advice - is there a good place to get replacement parts, or upgrades? mmm, and while I'm asking - I'm currently using an "old" NAD C715 CD/Receiver/Amp micro system to drive them - is there something that doesn't break the bank that would bring out the speakers better? I'm guessing this will be a long running project - the level controllers crackle, and only work in some positions, and I presume the crossovers could do with updating. Still, for speakers that were bought new when I was a baby, and then were what I grew up with after we came to Australia, they're really fun to listen to. Link to comment Share on other sites More sharing options...
VanArn Posted January 12, 2021 Share Posted January 12, 2021 Your choice is between obtaining secondhand Yamaha dome midrange units or having the originals repaired. I would suggest the latter course as there is always a risk with used items and they are usually not cheap to purchase. You may have to send the faulty speakers to Melbourne . Link to comment Share on other sites More sharing options...
Sven Dowideit Posted January 12, 2021 Author Share Posted January 12, 2021 Nice! I hadn't even thought that 50 year old drivers could be repaired... When you say Melbourne - is that because there's a particularly good repairer there? (aka, who should I talk to?) Link to comment Share on other sites More sharing options...
VanArn Posted January 12, 2021 Share Posted January 12, 2021 I would suggest contacting Garry Cawsey or Attilla Tanka. From past experience, the cause of the midrange speaker going open circuit is caused by the lead out flat tinsel wire from the voice coil becoming fatigued. This is delicate repair work. 1 Link to comment Share on other sites More sharing options...
jcadlols Posted January 14, 2021 Share Posted January 14, 2021 If you have no joy locally, there’s a guy in the US who re coils the Yamaha beryllium tweeters (and may be able to do these mids). https://www.ebay.com.au/itm/Yamaha-NS-1000M-Tweeter-Repair-service-You-Must-Send-In-Your-Driver-For-Repair/224168749395?epid=1301491474&hash=item34317fa953:g:sroAAOSw95FZaN4W Link to comment Share on other sites More sharing options...
Sven Dowideit Posted January 29, 2021 Author Share Posted January 29, 2021 I've started with the "easy" and risky option of buying a driver from ebay - and yup, it works. Between work and the kids starting school, it looks like I'll just enjoy what I have for a bit, and then see how much I want to poke things - now to figure out what other bits I have in the back of the cupboard Link to comment Share on other sites More sharing options...
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