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Welcome from Virginia! Enjoy your stay! Nice suite of equipment!

Best of luck on your repair, @Fernando Achiary. I recall reading a post on the NHT Group on Facebook, from Ken Kantor (original founder and designer of the initial line from NHT). His post was about ferro fluid. He seemed to indicate that it was very very rare that the ferro fluid would dry up on his drivers - but that it was possible. Sounds like you came across the one that did. Looking forward to your update.

Hi everyone, it's been a few days since my last post, but I have some news to share. I finally decided to do two things. You might remember that I suspected the tweeters' ferrofluid was the problem. One of those things was to disassemble the tweeters to verify that the ferrofluid was indeed completely dry. I cleaned them as the tutorials indicate. The voice coil and domes appeared to be in perfect condition. I bought the ferrofluid on eBay. It hasn't arrived yet. The second thing I did was remove the crossover and find that it had been completely rebuilt and modified with some audiophile-grade capacitors. It's very possible this work was done in Argentina. I'll show you photos of what I found. Overall, they sound fantastic, but the tweeters are a bit recessed and dull. If it's not the ferrofluid problem, then I should check the crossover.

Welcome to TCS - glad you found us!

I still hope to come up with a pair of 3.3, someday. but now they are 20+ years old..., so the next question will be how to rebuild/restore/repair if needed. 😉

Billy Golden Uncle Jefferson (1899)

Check out this thread.

1 ST Regiment Band One Minute Too Late (1899)

Since we've seen a few of your 2-channel configurations..., I'm curious to ask, @Daddyjt Mark, what is driving your Atmos (I'm sure you posted it before - but I forget). What kind of carver amplification is driving your atmos setup? I know @loner_t used to swear by the Marantz 8805 (IIRC) as a preferred dolby atmos head unit. What do you use for your processor/preamp system? I'm limited to 7.1 at the moment - but planning a future move a few years from now - dolby atmos likely coming into play. Thanks for the post, and keeping us on this leading edge of audio reproduction and experience in this thread.

Walter B. Rogers When You Were Sweet Sixteen (1900)

Sheet Music Singer When Reuben Comes To Town (1900)

I’ve been dying to try a pair of these with the 285… You may, now, have an excuse to invest in a pair… 😉

Sheet Music Singer When Chloe Sings A Song (1899)

Haydn Quartet My Southern Sunny Home (Coon Song) (1901)

Vess L. Ossman Ma Blushin' Rosie (1901)

Laura C. Herstein Little Brown Jug (1905)

Soundgarden My Wave

Welcome to TCS!

Macdonough & Dudley In The Shadow Of The Pines (1902)

Harry Macdonough I Can't Tell You Why I Love You (1900)

harry MacDonough Holy City (1900)

Edison Quartet GoodBye Dolly Gray (1900)

Vess Ossman Coon Band Contest (900)

Eagles One Of These Nights

Oh, you should now be able to post pictures since you have 5 likes.