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AR MST Tweeter repair - P/N 200014-1


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Hi all,

Hoping someone can give me some advice on the chances of getting a 200014-1 tweeter repaired.  I can see broken wire on the positive side, on the tweeter surface.  I don't know if there is a break inside. The tweeter itself looks in very good condition.

I just restored a pair of MSTs, I had to swap one out with the 2nd pair, so I am left with one tweeter needing repair for set 2 now.

I just did re-foaming on the first pair but feels like trying to repair this tweeter is a big step up.

Any advice?

Thanks,
Steve. 

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If the break is on the surface you could scrape away some of the coating and try to solder some fresh wire. I have a fair number of AR tweeters needing repair, most break on the surface from being store in less than optimal conditions rather than being overdriven.

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On 2/22/2021 at 9:09 PM, Stevie F said:

I can see broken wire on the positive side, on the tweeter surface

If that is the only problem the tweeter is repairable but it is a very delicate procedure and must be done by very experienced hands.

The 200014-0  / -1 tweeters are very  rare and very hard to find in the used market. They differ both from the tweeter used in the AR-6, 7, 8 and 4xa (# 200005) and from that used in the AR-18, 17 and 25 (200014-3) and cannot be interchanged.

The AR-MST / 1 (USA) and the AR-MST improved (Europe) have 3 tweeters in parallel and, for this reason, do require high impedance tweeters. So, differently from 200005 and 200014-3 tweeters,  200014-0 and 200014-1 are high impedance tweeters and have a DC resistance of about 10 Ohms (9.5 to 10.5). 

Unfortunately, in some old threads I have read about people who changed the first European version of the AR-MST (the one with 4 tweeters connected in series-parallel) to the "improved" version by using the MST improved crossover and connecting three 200005 tweeters in parallel. By doing so, the impedance at 9000 Hz is about 1.7 Ohm! Without considering the phase!

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