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New member - Dahlquist DQ10 questions

Hello gentle people,

im a retired electronics engineer so I now have time to do some repair projects I've been wanting to do. 
I've wanted to get back into listening to my stereo setup and be able to play vinyl again so I resurrected a pioneer pl 50 table and then got to looking at my DQ10's thinking I'd refoam the woofers, check the crossovers, etc. I've owned the dq10's for over 25 years and never did a thing to them but when I got them apart, I found the woofer surrounds to be in great shape, which I thought was really weird. The guy I bought them from mirrored them and I'm wondering if he then coated the woofer foams and that's why they're in such good condition.
I did find one of the 5" mids has a approx 1/4" tear in the rubber surround. It plays ok but I'm thinking the surrounds on both mids should be replaced. 
I've been doing a lot of reading but see no replacements for rubber surrounds for these.
Anyone know of a source?
Also, I'm driving these with a (about to be recapped) quad 405-2, that is driven by a Mac C27. 
Im thinking even after a recap, the quad may not be up to the task. Thoughts?

Thanks very much

ritamacaw
ritamacaw OP
17 posts
 
Thanks for that information.
I've ordered the 80uf caps for the crossovers. I may end up replacing others. 

Im thinking after the cap changes in the crossovers, the mid surrounds getting replaced and recapping my power amp, I'm going to just listen to them and not mess with the woofers for now unless I hear some strange stuff out of them. 
Have no idea if refoaming them would make any sonic difference being they seem so pliable after all these years. 
curiousjim's avatar
curiousjim
4,777 posts
 
I replaced the tweeters with Decca ribbons. It made a wonderful change!  
Best

JD
ritamacaw OP
17 posts
 
Did you replace the tweeters and unplug the super tweeters or replaced both tweeters in each?

thanks,
michael
ieales's avatar
ieales
1,201 posts
 
I've ordered the 80uf caps for the crossovers.
IME, the smaller the cap value, the more critical the quality. The difference between mylar and polypropylene can be quite astounding.

30 year old electrolytic caps may measure close to their value, but the ESR is likely much higher.

IMO, do it once and do it right. Do them ALL w PP!
ritamacaw OP
17 posts
 
Just got my mids for the dq10's back from Bill LeGall at millersound. They look like new speakers. They're now installed along with new 80uf crossover caps. Did the caps change to the quad 405-2 as well. 
What an improvement!  Speakers sound more alive, better low end as well as much better detail. 

Thanks for everyones responses to my project. Lots of very good information got some good sounds back in my house. 

Michael
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