Dahlquist DQ-10 tweeter replacement

[ANoteSupreme]

One of the tweeters in my Dahlquist DQ-10s is blown. (Came back from a work trip a few years back to find a tweeter fuse blown and my Minor Threat CD sitting out on a table...) Took it apart to check and the film was physically torn. I "repaired" it by spreading a thin film of polyacrylate glue over the tear, and it has played OK, but not great,
that way for years. Some serious distortion on certain notes especially in loud operatic solo vocals, and raggedness in loud classical music ensemble passages which I attribute, perhaps wrongly, to this damaged tweeter.

I'm wondering whether the same tweeter was used through the whole manufacturing run of DQ-10s. I have
the factory-mirrored version from relatively late in their history, serial numbers in high 45000s. The tweeters
in mine are mounted above the "mid-woofer", with their particle-board backing attached to the mid-woofer's
backing. I have considered purchasing a used DQ-10 tweeter I saw online as part of a similarly attached dome-tweeter and supertweeter assembly--- I'm assuming this assembly came from a different configuration, perhaps the earlier non-mirrored ones? The tweeter looks similar, but the metal back cover does not have the white "Made in W Germany" lettering that mine does.

I've seen it said that the DQ-10 tweeter was the Phillips AD 0160/T8, and I'm also aware that the original DQ-10 tweeter isn't made anymore. I just want to be sure that the used tweeter I'm considering is the same as the one I'm replacing (I know I won't have the benefit of a matched pair) before purchasing, especially since it's not cheap. I've seen various suggestions for non-original equipement replacement, and would consider those if I can't find good used originals, but ideally I'd like to keep the speakers as close to original as possible.

I also considered replacing the two electrolytic caps in my crossover, but they don't seem to be visibly deteriorated. Also, figured I should replace one thing at once and the tweeter is the most obvious.

Thanks for any advice you all have!

 

[Blue Shadow]

I have not read about different tweeters used in the speakers. I have not seen a dome tweeter positioned above the mid-woofer as the supertweeter is mounted to the same baffle board as the mid-woofer.

The dome tweeter is shown in all I have seen mounted on a separate board above the dome midrange. Maybe pics of yours to confirm.

If you replace the 'lytic caps, throw in a film cap. It should make the mid-woofer sound better as the cap is in the signal path to that driver.

 

[gtv2000]

I used this one. Sounds good to me.

https://www.parts-express.com/visaton-dt94-4-08-polycarbonate-dome-tweeter-4-ohm--292-554

 

[ANoteSupreme]

I have not read about different tweeters used in the speakers. I have not seen a dome tweeter positioned above the mid-woofer as the supertweeter is mounted to the same baffle board as the mid-woofer.

The dome tweeter is shown in all I have seen mounted on a separate board above the dome midrange. Maybe pics of yours to confirm.

Thanks! You are correct and I was confused by the appearance of the configuration from the rear, and by not having had
the grill off the front of the speakers for a long time--- I was confusing the mid-dome with the dome tweeter, and the dome tweeter
with the supertweeter, but obviously the horn supertweeter is mounted to the same baffle board as the mid-woofer, as you say.
With a flashlight through the grill, one can make out that the configuration is as you say. So what I failed to buy was indeed a
combination tweeter/mid-dome assembly exactly like the ones on my speakers. Too bad I didn't get on here earlier, as knowing
that would have made me willing to buy the set that just went on ebay! Not sure these are available all that frequently. The same guy is still selling the mid-woofer... Thanks
for straightening me out on this! I will keep an eye out for another, but it's too bad I didn't pull the trigger on this one. Meanwhile I'll take apart my speakers to verify which driver was actually torn.

 

[Blue Shadow]

Post up what you have and what you need. Folks do repairs on the midrange I think...Bill Miller at Miller Sound, need to confirm, though. There is always the bay as there were 50,000 of these made and many are giving up parts these days.