Thanks Galu.
If I can get over the tweeter problem I'll definitely review the caps.
The other benefit is that reasonable electrolytic caps aren't expensive.
Just where on the back of your tweeter is it cracked?...is it under the backing plate or?
-----------------------------------------------------------------------------------------------------------------------------Rick...
-----------------------------------------------------------------------------------------------------------------------------Rick...
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The only thing I can think if is to dis assemble (if that is possible) without destroying the tweeter and fit a replacement magnet??
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Oh, only now I see.
That magnet is cracked!
It must have fallen hard on a concrete or tiled floor.
Yes, technically, it CAN be replaced, it involves full disassembly and major surgery, but not at home or in an Electronics service shop, only at a speaker Factory or an *advanced * reconer
Not sure if square magnets are still available, but a proper thickness ferrite ring, its diameter some 20% larger than a square plate side would work fine here.
Problem is cost: freight both ways would be way more expensive, so your second best is to try and find a spare one on EBay
Just curious: can you measure healthy square magnet on the "good" tweeter?
Square sides and ferrite thickness, Metric if at all possible.
That magnet is cracked!
It must have fallen hard on a concrete or tiled floor.
Yes, technically, it CAN be replaced, it involves full disassembly and major surgery, but not at home or in an Electronics service shop, only at a speaker Factory or an *advanced * reconer
Not sure if square magnets are still available, but a proper thickness ferrite ring, its diameter some 20% larger than a square plate side would work fine here.
Problem is cost: freight both ways would be way more expensive, so your second best is to try and find a spare one on EBay
Just curious: can you measure healthy square magnet on the "good" tweeter?
Square sides and ferrite thickness, Metric if at all possible.
Thanks J
The square magnet is 77mm x 77mm x 12mm
The outer plate is 73mm x 73mm x 4mm
The plate sandwiched against the mounting square is 73mm x 73mm x 2mm
The square magnet is 77mm x 77mm x 12mm
The outer plate is 73mm x 73mm x 4mm
The plate sandwiched against the mounting square is 73mm x 73mm x 2mm
There should be no danger of shorting the amp provided the magnet halves still remain firmly sandwiched between the metal front plate and the metal back plate - see the magnet assembly in the typical loudspeaker cross section below. The cracked magnet should still do its job effectively - a listening test comparing with the good tweeter will confirm or deny that - but you may want to tidy up the crack with some black silicone sealant to make you feel better! JMF may have more to say about using cracked magnets.
As far as 901s go, placement is critical (I prefer mounting the stands on the ceiling). And many many folks with money to burn on a sound system will just believe the salesman, who will always prefer the more expensive option. They have no idea what things are supposed to sound like, so they can't tell if a speaker is good or not.
For my computer sound system I run the 3.5mm output into an old Kenwood 100WPC minimum rms, satellite speakers that cost about 70 for 2. And a 10" powered subwoofer that I purchased broken and repaired. That's perfectly fine, because no one knows what computer sounds are supposed to sound like.
But the upstairs PC is connected the same way with a Rotel integrated amp, 2 expensive Finnish satellites that sound perfect, and a newer jbl powered sub. I play flac files on that system, so it has some use besides being loud.
Someday all the 901s will be gone. I don't know how much a restoration costs, but there's a local reconer in my area. I would imagine it's at least 400.00.
For my computer sound system I run the 3.5mm output into an old Kenwood 100WPC minimum rms, satellite speakers that cost about 70 for 2. And a 10" powered subwoofer that I purchased broken and repaired. That's perfectly fine, because no one knows what computer sounds are supposed to sound like.
But the upstairs PC is connected the same way with a Rotel integrated amp, 2 expensive Finnish satellites that sound perfect, and a newer jbl powered sub. I play flac files on that system, so it has some use besides being loud.
Someday all the 901s will be gone. I don't know how much a restoration costs, but there's a local reconer in my area. I would imagine it's at least 400.00.