They haven't been shipped - so Good HiFi have said they will refund me 🙂
I will buy the foam surrounds & glue now from Audiofriends!
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Beloab 150 / Penta Upgrades
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Let us know how you went! Pictures...
Location: Utrecht
Quite a challenge to achieve "Less is More" while having the Beovirus.
Ordered the foams & glue from Audiofriends - and awaiting a refund from Good HiFi
Here's a picture of the mids as they are now. Surprising they have survived this long - but you can see some fuzz emanating now - and I daren't touch them 😮
OK - the foams arrived today!
The auction did say 2 x glue & 2 x brushes - but I only received one of each? So I have asked about that.
Here is one set of mid's before I start. My drivers are the ITT variant. I placed one of the foams on top of one of the drivers as pictured below - and they are indeed an excellent fit 😁
I also noticed that my tweeters are different 😉 More about that later.
Work to do first!
So, some work to do indeed.
Start by proper cleaning the old drivers without sanding paper.
I've shimmed the last 5 or 6 sets as the dustcap sometimes isn't placed corrrectly in the middle. I mark each position of the caps. At last I glue them back in its original position. By shimming you are guaranteed that the conus is placed in the middle. So, the voice-coil will move freely without making a scraping sound.
The tweeter is changed during the period the mk3 was sold. Early mk3's have the same tweeters as yours, and the onces placed in the later versions have a different dustcap.
Location: Utrecht
Quite a challenge to achieve "Less is More" while having the Beovirus.
Thanks Beobuddy 🙂
Have removed and cleaned up four drivers so far. The worst part is removing the glue from the basket - I found a good solvent that does the job without affecting the plastic basket.
How did you remove your dust caps without damaging them?
I too found it troublesome to remove the glue from the frames. Here's a picture of my refoam using AuioFriend's kit. My skill is not as high, but it worked well overall. It took many hours of break-in, then there was a nice improvement in sound.
I have also rebuilt the crossovers using polypro foil caps and good resistors. On the tweeter resistor, I went with a 1.5 ohm rather than the original 1.8 ohm. I had always though the tweeters could use a little boost. But now after the rebuild they are too loud! Probably will go back to the 1.8 ohm. On the caps, the 68 uF ones were too large to fit on the board, had to use extension wires and glue them inside the Penta's cavity. Overall a BIG difference in clarity!
Great job there Cordobaman 🙂
I will get to the crossovers at some stage - my plan of action is midranges / amplifiers / crossovers in that order.
I've stripped all but one now. A time consuming job - and great delicacy is required - most especially when removing the foam glued to the cone.
Beobuddy I would like to shim them - to get them as centred as I can. How did you remove your dust caps? the adhesive used is different for the caps. Is there a solvent that will loosen them - or a little heat maybe? I could slice them off - but that will require some very careful handwork in order not to damage them or the cone.
I found cluing surronds easier to do when speakers were back in frame. They were more stabile in it.
I've made a special carrousel the turn the mids. It's easier and esssential to glue both parts before putting them together.
I've made a picture when cutting the dustcap. Just take a bare piece of knife to cut a close as possible to the conus without cutting through the conus itself. After glueing back you will hardly notice the cut.
Location: Utrecht
Quite a challenge to achieve "Less is More" while having the Beovirus.
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