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Heresy k77 tweeter issue


uteman1011
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I rescued a pair of H1’s yesterday. Birch raw painted black and in poor shape so I’ll probably sand, bondo and repaint. 
Both tweeters are dead. I measured on the multimeter and the come up zero. 
Can I simply change out the diaphragms and be good to go, or is there more to it than that?  

4C053D64-30D1-4DE6-9F9A-0409B9564CD6.jpeg

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18 minutes ago, jimjimbo said:

Changing the diaphragms is all you should need to do.

 

https://critesspeakers.com/klipsch_tweeters.html

Yes. Leaves me wondering how much clipping or overpowering amplifiers abused those Heresys to blow the tweeters. The Heresy was the most rugged of the Klipsch Heritage because of it's high impedance. Easy fix either way.

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17 minutes ago, Racer X said:

I've seen a pair of the K-77 M tweeters for sale in the garage sale section....

Since the tweeters in the photo are the "mud magnet" version that keeps it's magnetization much, much longer than the old Alnico Magnet versions of K77's, I think just replacing the Diaphrams is still the "mo betta cheapa" option, oui?

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23 hours ago, uteman1011 said:

Thanks for all the feedback!  I’ll order a pair of diaphragms and give it a shot. 

the diaphragms sold online for the Klipsch K-77 are Aftermarket made on the same jigs in China  - the cups are assembled in the PH  , a Made in China diaphragm is soldered it to a plastic cup  .

 

Part Numbers .......Aftermarket K77 diaphragm  is Part #  89486A   ( cups or no cups -same diaphragm )

                               Aftermarket K77 diaphragm with the cups is Part #  89486A Faceplate  or 127126 -89486A

                                                                                       

Prices :    

                2x 36$    https://www.ebay.com/itm/111682597741?hash=item1a00cd336d:g:~8AAAOSwCy5ck8d6

               1x19,95$ https://www.simplyspeakers.com/klipsch-replacement-speaker-diaphragm-k77-89486a.htm

klipsch Authorized 

1x cup  57$         https://www.amazon.com/Klipsch-Factory-Speaker-Diaphragm-127126/dp/B00IT1CG4K

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4 hours ago, uteman1011 said:


Can I simply change out the diaphragms

 

 here 's the installation video , 10-15 minutes per unit is all it takes -you'll re-use the diaphragm gasket , no need to over-tighten the 4 screws , snug tight all around -

 

 

 

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I had bought new diaphragms for my K77 from a Dutch dealer but my repair store said they were the cheap bad ones from China. My original diaphragms were found to be good and continued to be used, only the Alnicos were remagnetized.
To be safe I would buy the diaphragms from Crites. There are obviously different qualities.

I would carefully connect one of the dead tweeters to a small battery once to see if it is really dead or if it gives a crack sound. Not that the crossover is the reason.

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@Madman1 all current diaphragms are aftermarket copies of the EV diaphragm , all are Made in China ,- the EV diaphragms were discontinued in 2000  -

 

Here are the Part numbers you must look out for anytime you want to buy an Aftermarket K77 diaphragm of decent quality -

 

Part Numbers .......Aftermarket K77 diaphragm  is Part #  89486A   ( cups or no cups -same diaphragm )

                               Aftermarket K77 diaphragm with the cups is Part #  89486A Faceplate  or  part #  127126, 89486A

 

Klipsch Authorized Store 57$   -Klipsch Factory Speaker Diaphragm K77-F, 127126, 89486A    

 

https://www.amazon.com/Klipsch-Factory-Speaker-Diaphragm-127126/dp/B00IT1CG4K

 

 

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