mission 753 Repacement Tweeter Saga - diyAudio
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Old 22nd May 2009, 12:13 AM   #1
jops is offline jops  United Kingdom
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Default mission 753 Repacement Tweeter Saga

Not wanting to bore people with the long running saga regarding the doomed 753 tweeters , I was wondering if there was anyone out there that had experimented with different branded Tweeters and whether they had any success.

I'm still loathed to throw out my 753's and want to have a bash at putting new life into these. I cant find an original spec for the tweeters other than there 4 Ohms so its difficult to match them.

If anyone has had a go I would appreciate your experience

thx
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Old 22nd May 2009, 06:22 PM   #2
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Is your problem just the tweeter. Please post a picture and more details, like size (face plate), dome material, xover, serial numbers. Did you tried to send for repair? I could not understand what you are in need.
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Old 23rd May 2009, 04:14 PM   #3
jops is offline jops  United Kingdom
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Hi Inductor

Thx for the reply. I've checked the voice coils on both tweeters and the circuits are open, inspection confirms the damage, replacement tweeters and voice coils are no longer available.Visual inspection of the XO looks okay nothing fried.

the XO

the complete XO

The original tweeter is 4 Ohms but cant find any further info.

the tweeter

I was wonder whether anyone had used a none mission tweeter on these speakers with any success, as I know that these were popular and given the availability of parts.

the lower OX tweeter control

I realise that the drivers need to be carefully matched to XO, being a newb what be the pit falls of -

a. just fitting another decent 4 ohm tweeter

b. fitting a 6 or 8 ohm unit with additional resistors ( and what these might be) in parrallel

c. not blowing up the rest of the speakers and half the neighbourhood

Mission 753 spec

Unfortunatley I dont have a scematic not the equipment (only a MM ) to make one.
I'm a complete newb at speaker modding and repairs, I'm ok with a soldering iron but my idea of a resistor is something 8mm long , not the size of a house brick, so you must excuse me.

many thx for any assistance
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Old 23rd May 2009, 05:40 PM   #4
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Just a follow-up on documentation.

One of 25 different versions of speaker/xover for the 753 Mission by diyAudio-justblair.
http://www.diyaudio.com/forums/showt...57#post1195557

Problems and fixing/looking for a tweeter or voice coil for the 753 Mission.
diyAudio Forums - I bought bad Mission 753's, T's and x-overs fried, worth fixing?
I bought bad Mission 753's, T's and x-overs fried, worth fixing?

Also in the meantime take some time and give a call to
Wilmslow Audio UK
https://secure.wilmslow-audio.co.uk/...f2657ea7349ff4

peter comeau at World Designs UK
http://wduk.worldomain.net/

ratechnology.co.uk - Richard Allan - Recone Lab
http://www.ratechnology.co.uk/index....de01126a1bb418
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Old 23rd May 2009, 08:37 PM   #5
jops is offline jops  United Kingdom
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thx for the reply

read the article regarding the rebuilding of the fried 753's which was really interesting.

Will check out the other options. I have that 'feeling' that this may become obsessive, as long as it does'nt become compulsive
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Old 24th May 2009, 12:50 AM   #6
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What's the voice coil/dome size? Would you like to have a metal dome or textile? Does price matter? You see there is this (new) tweeter from Audax that looks very good on paper/specs and that could work well but I don't know how to implement it for you, this is, if you are interested in this crazy adventure and if it is adaptable or not in it's mechanical dimensions.

Audax TW025A8 (25mm) 68,20
http://www.cadaudio.dk/tw025a8.pdf

Vifa DX19TD05-04 (19mm)
http://www.madisound.com/catalog/pro...oducts_id=1647

Morel MDT29-4 (28mm) Textile dome
http://www.madisound.com/catalog/pro...oducts_id=8609
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Old 24th May 2009, 01:27 AM   #7
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I think it's a 19mm Vc. tweeter with a 57mm diameter. But you decide (I had to read everything).

If you can't repair/replace just upgrade.

Peerless part number (811877)
http://www.diyaudio.com/forums/showt...00#post1289700
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Old 8th August 2009, 10:55 PM   #8
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Hi,

we've just repaired the tweeters of MISSION 753. As we can't get replacement drivers either from MISSION nor from PEERLESS (difficult times for the PEERLESS guys since they were bouht by Tymphany) we looked for another tweeter that fits into the front grille without too much mechanical modification.

We finally used a CAR POWER DT-284S from MONACOR. This need only minor modification of the X-over, too.

We will issue a report on the tweak in a few days . . .

BR Pico
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Old 26th September 2009, 07:36 PM   #9
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Default Mission 753 tweeter repair

Try Sinevoice in Belgrade, Serbia, he can repair the 753 tweeters, if you still have the old ones to send to him: www.sinevoice.com

BRgds Klaus
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