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RE: MGIIIa tweeter question

Posted by Davy (A) on August 13, 2014 at 05:50:49

In Reply to: RE: MGIIIa tweeter question posted by Roger Gustavsson on August 12, 2014 at 22:55:54:

Thanks for the info. Well its great to know someone can replace the mylar with the same spec and tension for a cost. I can rewire myself but it's a bit of a slow process so rewiring as well is welcome. Seen many different Tympanis before for sale with broken mylar. If this had been available then....

I think you are right it's actually well worth trying an narrow 3 ohm ribbon foil in an older wide cage. The gap is wider but not vastly. I thought about it before but was put off as it's is very important to get those adhesive dots down to secure the ribbon and I didn't think it would be possible (discussed it with Satie). If it however viable to put those dots in (might be a bit tricky because of the extra space) then it might work just fine. I might try it soon in my MGIIIa tweeters cages, as like I say, that narrow ribbon sounds a lot better than the 2 ohm wide type.

I'd still bet on your Tympanis having the older discontinued 3 ohm wide ribbons in them though, as there are no resistors in the crossover. It's still a good tweeter, just not exactly replaceable if it breaks. Its a very thin material so I'd be careful moving them around.

Its a bit weird that Shelia is not aware of the older 3 ohm wide tweeter that is 60" long. It's likely a common issue that comes up with people break their MGIIIa ribbon as both the wide 3 ohm and 2 ohm ribbon was used in that tweeter, and if supplying a new 2 ohm ribbon to someone that had an early MGIIIa (with the 3 ohm ribbon) they need to be told to install 1 ohm resistor in the crossover. Info about that is written in the MGIIIa manual. The Tympani IVa obviously also used both types of ribbon too throughout its manufacture.

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