Leaky 9900 Revelator?

mazdapowered · 21st November 2006, 01:54 PM

Hi all,

My NOS 9900 Revelators (not through any diyaudio member) just arrived the excitement was short lived though as it looks like one of the tweeters is leaking. Can I assume the ferrofluid has leaked and the tweeter is toast?

Please see attached photo.

Many thanks

mazdapowered · 21st November 2006, 03:34 PM

blank527 · 21st November 2006, 08:32 PM

As far as I know, there is no ferrofluid in the 9900 revelator.
(could be in the older line as you say it is NOS)
Is it sticky?

Remco Blankesteijn

mazdapowered · 21st November 2006, 09:27 PM

Yes they are NOS, so no idea how they old they are.

Also had a look around the web and can't find any mention of ferrofluid/oil etc. either but I couldn't think what else it could be.

It doesn't fell sticky, more like light machine oil.

Regards

Paul W · 21st November 2006, 09:34 PM

Maybe something leaked onto the driver?? When I bought 9900's I specifically did not want ferrofluid and have never seen mention of a version with it.

Try comparing the impedance curve against the "good" one.

mazdapowered · 21st November 2006, 10:53 PM

Quote:

Try comparing the impedance curve against the "good" one.

Sadly I don't have any speaker test gear at the moment, I sort-a jumped the gun a bit and bought them ahead of time due to the cost saving.

On your suggestion, i decided to measure the Re and also discovered that one of the terminals on the 'good tweeter' is only making intermitant contact.

Given there are obvious problems with both the tweeters I've decided to send them back - just not good enough for something that is supposed to be unused.

Thanks all.

Spilferderber · 22nd November 2006, 05:29 AM

the 9700 and 9900 series have no ferrofluid (but the 9500 does)

21st November 2006, 01:54 PM	#1
mazdapowered diyAudio Member Join Date: Jan 2006 Location: UK	Leaky 9900 Revelator? Hi all, My NOS 9900 Revelators (not through any diyaudio member) just arrived the excitement was short lived though as it looks like one of the tweeters is leaking. Can I assume the ferrofluid has leaked and the tweeter is toast? Please see attached photo. Many thanks __________________ Richard

21st November 2006, 03:34 PM	#2
mazdapowered diyAudio Member Join Date: Jan 2006 Location: UK	__________________ Richard

21st November 2006, 09:27 PM	#4
mazdapowered diyAudio Member Join Date: Jan 2006 Location: UK	Yes they are NOS, so no idea how they old they are. Also had a look around the web and can't find any mention of ferrofluid/oil etc. either but I couldn't think what else it could be. It doesn't fell sticky, more like light machine oil. Regards __________________ Richard

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21st November 2006, 08:32 PM	#3
blank527 diyAudio Member Join Date: Nov 2001 Location: Haarlem	As far as I know, there is no ferrofluid in the 9900 revelator. (could be in the older line as you say it is NOS) Is it sticky? Remco Blankesteijn

21st November 2006, 09:34 PM	#5
Paul W diyAudio Member Join Date: Oct 2003 Location: North Georgia	Maybe something leaked onto the driver?? When I bought 9900's I specifically did not want ferrofluid and have never seen mention of a version with it. Try comparing the impedance curve against the "good" one.

22nd November 2006, 05:29 AM	#7
Spilferderber diyAudio Member Join Date: Nov 2006	the 9700 and 9900 series have no ferrofluid (but the 9500 does)

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