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Hi
The problems you discribed are mostely caused by the rotten foam inside the speakers.
There is a PCb in the lower section of the speaker with the relay circurit, the most lower copper traces can be solved by the rotten foam and must be renewed with e.g. some wire soldered to the start and end solderjoints.
Further information about disassembling you can find here:
Look for these traces:
Any questions? let us know.
Kind regards
Christian
Hi, here are some news…
I cleaned the wood with a magic eraser and a light soaped water with a neutral soap.
After letting it dry I put some renovating oil on the wood and let it shine again.
I recapped the Crossover network with new bipolar caps, just business as usual, old ones out new ones in.
After that I assembled the chassis into the front frame and made the wireconnections to the speakers.
Mounted the frame to the speakers and made a testride.
Wow that sounds absolutly amaizing.
Here is the not really finished speaker, fabric was not delivered today 😉
Hi
Yesterday the foam surround from “Good Old HiFi” NL arrived.
So I started to refoam the 4 woofers.
First I started with the 8″ woofer, cleaned the cast frame and carefully sraped the old glue from the plastic cone. My favorite solvent Mellerud glue remover made a good job.
Before:
After:
After cleaning I glued the foamsurround as much possible centered to the cone. I’ve made a marking arround the cone to see how far the glue should be painted. Put the glue to the backside of the inner foam let it dry for about 5 minutes and pressed it firmly to the cone.
After that I clamped the outer foamring with clothpins to the frame and made a test with a conected amp and my mobilephone and the “Tonegenerator” app at 25 up to 50 Hz to hear if the voicecoil is aligned an centered. No adjustments where requiered. The 8″ woofers need no chimming in my case and I glued the foam to the cast frame. You could see on the last picture.
Up to the 10″ woofer.
I started with glueremover very carefully only on the old rotten glue because the cone is made of paper and I would not to get to much moisture into the paper.
After about 10 minutes I could peel off the old glue with my fingernail. There is a minimal layer of paper wich comes off with the old glue but that’s no problem.
As you cn see there is a damage left from the stick wich was mentioned in the first post. The new foam surround covers exactly thes damages so I’m happy. ;-))
Next was the same steps as the 8″ woofer, I glued the foam to the cone , tested with clothpins and made a marking around the outer foam to know where the foam has to be glued on the frame.
The cone centered itself like the 8″ woofer, no alignement nessesary.
Here is the result: cheers;-))
Complete set of woofers after 5 hours:
Thanks for watching!
Next is the renew of the fabric grilles, new capacitors on the filterboard and refreshing the wooden case.
Kind regards
Christian
Hi
In between I dissassembled the 8″ and 10″ woofers from the cabinet.
The coils are measuring all good so far.
I decided to bring them back in shape as following:
Took some aluminium profiles 10X10 mm and put them underneath the cone to lift the cone upards about 1 cm above the metal frame.
Sprayed with a small amount of water front and back of the cone and let them laying cone downwards on the table over night.
The weight of the chassis gave the right amount of pressure to the cones and next day it looked very good for me.
on the picture you could see the result.
Does anybuddy have a good source for the front fabric? Mine have some small holes and not looking good anymore.
Still a little bit dirty but that will be no problem so far ;-))
Waiting for the foam surrounds…..
Kind regards
Christian
