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Post by valejean on Mar 17, 2015 1:40:13 GMT
Hello everyone, I will finaly have time to refurbish these old Magisters but need to know the proper size of the BA (I believe they are BA, as we do not have BA in Canada  ) nuts holding the bass driver as they were found with nuts missings. Anyone can help on this? Michel |
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Post by John on Mar 17, 2015 10:31:22 GMT
Try some of the DIY Audio forums
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Post by pre65 on Mar 17, 2015 11:17:57 GMT
There is only one safe method.
1) Measure the outside diameter of the thread.
2) Count the number of threads per inch. (a magnifying glass might help).
report back with the information. Or use this link to work it out yourself.
en.wikipedia.org/wiki/British_Association_screw_threads
I purchased a very cheap pair of Magisters some while ago, but it seems the drivers were not original. Tha bass unit was (from memory) a H & H woofer.
I sold the woofers on and used the cabinets as bass bins with 18" Fane units. These are still in use (but much modified) as part of my OB speakers.
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Post by pre65 on Mar 17, 2015 11:30:16 GMT
The largest BA size is 0BA, and that is VERY similar to M6, but the thread angles are different, also The 1mm thread pitch should be easy to read. 
So if your threads are 0BA, I'd suggest replacing the screw and nut with modern M6, much easier to obtain.
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Post by Sovereign on Mar 17, 2015 12:01:46 GMT
I used to have a pair of Magisters, very good indeed.
I sold them onto a chap on the south costs. I could ping him a message if you want ?
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Post by valejean on Mar 17, 2015 13:02:46 GMT
If the quad 3 series is assembled with BA4 bolts, than It must be indeed anywhere between BA2 & BA0 I suppose.
I have, in the past, replaced threaded fastners on a chip board front batten. Not sure I would like to get into this again, I am missing only 4 nuts (per drivers).
I should have ordered the cross-over capacitors from Falcon acoustics long ago, I beleive they no longer stock the low-loss ELCAP
Thank you for the BA wiki link.
Thank you all.
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) nuts holding the bass driver as they were found with nuts missings.
