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KLH 9

172.9.116.164

Posted on February 29, 2016 at 14:00:17
Ross
Audiophile

Posts: 1293
Joined: January 24, 2000
I have located a pair of KLH 9 speakers. They will probably need restoration, if not a full rebuild. I have received a repair pricing sheet from Janzen (current company). Does anyone else repair or rebuild these speakers ?

Thanks,

Ross

 

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     RE: KLH 9 - pictureguy 23:12:42 03/09/17 (3)
       RE: KLH 9 - Chinacave 12:00:05 03/12/17 (2)
         RE: KLH 9 - pictureguy 12:39:44 03/12/17 (0)
         RE: KLH 9 - Chinacave 12:06:29 03/12/17 (0)
     RE: KLH 9 - garymuffley 18:27:14 02/29/16 (1)
       RE: KLH 9 - Chinacave 20:52:56 03/09/17 (0)
RE: KLH 9, posted on February 29, 2016 at 18:27:14
garymuffley
Dealer

Posts: 269
Location: Tallahassee
Joined: March 29, 2006
I have rebuilt several pairs. The panels themselves rarely go bad; a thorough cleaning usually brings them back to full spec. Be careful not to remove any of the blackish coating on the actual mylar panels or you will comprise the performance.

The hassle in rebuilding the speakers is the power supply. Frequently one or more diodes in the voltage multiplier circuit is blown. You have to melt the wax out of the power supply enclosure, which is a royal pain and time consuming. After you make the repair you have to re-melt the wax and pour it back into the enclosure. Very labor intensive.

 

RE: KLH 9, posted on March 9, 2017 at 20:52:56
Chinacave
Audiophile

Posts: 23
Location: New York
Joined: January 18, 2010
I am restoring 2 pair right now. The power supplies aren't THAT bad, I am more worried about cleaning the panels.

 

RE: KLH 9, posted on March 9, 2017 at 23:12:42
pictureguy
Audiophile

Posts: 7084
Location: SoCal
Joined: October 19, 2008
Since Janzen INVENTED 'stats, I'd let them do it.
Even if it cost more.

I believe it is the SON of the original inventor who is now in charge, so to speak.
Too much is never enough

 

RE: KLH 9, posted on March 12, 2017 at 12:00:05
Chinacave
Audiophile

Posts: 23
Location: New York
Joined: January 18, 2010
Yeah, there's that, but I'd like to do it myself...

On cleaning the woofer panels -



David Janzsen mentions using diluted ammonia WITHout any detergents, and I assume a distilled water rinse so nothing is left that can conduct, and then drying in a closed container with desiccant -
So far with the exception of science / chemical supply houses, all of eh ammonia I can find has detergents / surficants in it -

Any tips or experience would be most welcome.

 

RE: KLH 9, posted on March 12, 2017 at 12:06:29
Chinacave
Audiophile

Posts: 23
Location: New York
Joined: January 18, 2010
And the $$$$, of course!

 

RE: KLH 9, posted on March 12, 2017 at 12:39:44
pictureguy
Audiophile

Posts: 7084
Location: SoCal
Joined: October 19, 2008
See if you can find SEMI grade.
this will be pure stuff and come with anallysis certificate.

Unfortunately, NH3 is a GAS and to find it as a liquid, it must be 'mixed' in some fashion. Water would be the most common dilutant but I'm not certain of concentrations available. Or what the maximum solubility IN water would be, which limits the concentration.

Any 'liquid' Amonia will be such a concoction.

Ask Janzsen just what he recommends as a brand name and if some of those 'impurities' would be OK.

The LIQUID form is called Amonium Hydroxide and is nasty. Use ONLY in extremely well ventilated places. I'd wear an Eye Shield (not just safety glasses), a full apron and past-the-elbow GLOVES. I believe the maximum concentration is about 30% or maybe 40%.

Not comfortable working with stuff like that? Leave it to the professionals.

I have trouble finding pure Isopropol Alcohol and Hydrogen Peroxide over 3%.
Too much is never enough

 

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