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ChrisM

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About ChrisM

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  • Birthday 11/14/1951

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  • Gender
    Male
  • Location
    Near Seattle
  • Interests
    Classic Stereo, Synthesizers, Cooking Shows, Britain

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  1. ChrisM

    12.5 question

    Sorry for the upside down close up picture. No ideas on the different surrounds?
  2. ChrisM

    12.5 question

    First the Family Portrait. The 2 on the left are the gauze type and the 2 on the right are the cloth type. The top right one is a Model 24 tweeter. And here is a closeup of the bottom 12.5s.
  3. ChrisM

    12.5 question

    True, but my point was about what it is made out of rather than the color. The tweeter in the Model 24 and the 3" fullrange from a Model 8 have similar surrounds to my 12.5s out of the 11 portable. I've looked at a lot of pictures on Google and all the 12.5s appear to have the gauzy surround with black or clear goop. I would have thought someone else here had seen some like mine.
  4. ChrisM

    12.5 question

    So I ended up getting an entire gallon of Toluene and thinned out some of Roy's goo. In a non-scientific way, I would say that the result was about half as thick. I have some totally beat up 11 portable speakers which are essentially unrestorable because of the case so I didn't feel bad about harvesting a driver to try the thinned goo on. It would appear that there is more than one variety of 12.5 which I hadn't realized. The ones out of the portable have a different surround from the ones in my 11w's. I haven't looked yet at any of my 14's. The material is cloth with a clearish sealant. The ones from the 11w are more like a gauze with a black sealant. The cloth ones also have a lower Fs. Any ideas?
  5. In case anyone cares, the coil is 5mH and 1.8 ohms. I have a set of Fourteens, Fourteen B's and a set of Model 15 speakers which are Fourteen B's without the network. I pulled the network out of a Fourteen when I started the restoration. I also think the Fourteen is one of my favorite speakers. They're kind of like Bumblebees who shouldn't be able to fly. Fourteens shouldn't sound as good as they do.
  6. ChrisM

    12.5 question

    Richard said he couldn't sell me his sealant and asked which drivers we were talking about. I sent him a even more detailed description of the 12.5s and the AD5060s and the fact that we have a most excellent sealant but I have concerns about using it on the little guys. I said since he is expert at putting sealant on cloth (ADS tweets and mids), I would appreciate any insights he might have. His response..... "I have done AR woofer surrounds in the past with cloth surround sealer. I think you should find the original coating to use on your drivers." Needless to say somewhat disappointing.
  7. ChrisM

    12.5 question

    Inspired by the link Pete B suggested about tweeter renovation, I reached out to Richard So the ADS rebuild god. I am now in contact with him and will report his thoughts on the topic of light weight goop for mid-ranges and 12.5s. More to come.
  8. I agree. I think the Lexel should be investigated, I don't think 17s should be the guinea pigs. I would say check out some thrift stores and find some no-name crap speakers to try it on. Of course if you don't have the gear to check the Fs before and after you could only go by ear. Not very scientific. Another low tech test might be to get a bit of Oxford cloth or even T-Shirt material and put some Lexel on it, let it set up and then see if how pliable it is. It should be close to the same as having none on it. Your 17s won't get much worse if you wait a bit and do tests first.
  9. ChrisM

    12.5 question

    Thanks ra.ra. It kinda looks like Startex is a East Coast thing. I am in Washington State near Seattle. I can't find any quart cans just the gallon. I could, if necessary, use Xylene which I can get in quarts. Roy said it is OK to use but if I can I'd rather get the real thing. I'll keep looking.
  10. ChrisM

    12.5 question

    Great idea on the pre-treatment with solvent idea. I guess I'll have to spring for the gallon can of Toluene. The only place I can find it has it in a gallon can for $30. I'll have enough to last the rest of my life. Oh well.
  11. ChrisM

    12.5 question

    I did a search and found him. Mark Wilson, goes by KLHSvcMgr. The posts were back in 2007 or so.
  12. ChrisM

    12.5 question

    In the case of the AD5061 drivers I have out of Rectilinears, there is the original Philips spec sheet which lists the Fs as 85Hz. I'm trying to ascertain where anyone knows what a typical production Fs would have been for the 12.5s when they were manufactured. KLH wouldn't publish this because they didn't sell drivers separately. The was a member here who, I believe, uploaded the service bulletin 60 about the sealant. I think, without looking it up, that his name was KLHSvcMgr. He might have some insight on this but I think he's long gone. By the way, the AD5061s I have are totally dried out and they measure 91 for their Fs. If they were about 85 back in the '60s, I don't think they'll be hurt by Roy's goo and probably be helped by making them more compliant. I may thin the goo out a bit because it was tested on woofers not the super thin surrounds on the drivers we're talking about.
  13. ChrisM

    12.5 question

    Pete, i just looked at the links you suggested about re-doping tweeters. I have some of the Audax tweeters which are a bit crusty so thanks for the links. I also think a call to Richard So of ADS restoration fame would be good since they work on highly doped tweeters all the time. I was PMing with Roy about his sealant and he suggested that less is more. The thing about the 12.5s and the Philips mids is that they also go to rather high frequencies and the surround if not terminated correctly could mess that up. Chris
  14. ChrisM

    12.5 question

    What Kent said. Also, and perhaps less important, there was the tweeter version as in the Model 24. I know from the saga surrounding Roy's experiments to recreate the cloth sealant that the main thing is to monitor the Fs. The question is what was the Fs of them when they were new? I can measure a dried out driver and then reseal it and the Fs shouldn't go up and remain there over time but Henry didn't ship them dried out so I don't know if it is REALLY correct. Maybe I just obsessing over this but you can't really say it sounds right if you don't know if it works right. I won't even ask about the correct magnetization level for the Alnico magnets in old woofers...... Chris
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