Omega Owners Forum
Chat Area => General Discussion Area => Topic started by: EMD on 28 October 2016, 11:26:52
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Me Wharfedale home hifi speakers well one of them is making a crackling sound ??? It clears for a few hours then starts crackling again :( Are they ready for the bin or can it be fixed :-\ :-\ #
Technics/AKAI seperates .
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If it is the speech coil rubbing on the magnet (most likely cause), then the cost of repair could well exceed the cost of replacement.
Is this a cherished item?
Ron.
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Wharfedale did actually make some decent speakers years ago, depending how old they are and which models they may have matched speaker pairs in them.
As Ron says most likely the Coils have rubbed down, could also be a slim chance that one of the Caps in the crossover may have gone leaky.
If it was me, I would swap the Speaker them selves over from each cabinet and see if the fault moves or stays to each cabinet, that will point down to the faulty component. Guessing its come from the Bass Speaker or could be Mid Range if fitted.
As said though you can get some bargains these days on second hand speakers vs the cost of repair.
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The speakers are quite old but in very good condition .. Like these :
(https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcSQU_rL373Tqj_vrCOuvdwUJ_0ZximEaWgzsgWnAyhD6MFfMx6pIg)
Roughly 20" x 10 x 10 I'd like to keep them if possible . But as you say some decent bargains to be had for a replacement pair of a different make if wanted . Any recommendation of speakers :)
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Have you positively identified the drive unit yet, and if so, what is its model number or other ID? You have nothing to lose by blowing air from a tin into the speech coil if you can gain access, or more drastically insert fingers of PTFE in the gap between the coil and magnet.
Or look on eBay!
Ron.
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Model number is S500 .
Cant see any way of accessing the speaker as it all seems to be sealed tight . Oh and they a very heavy :o
Just blew into the holes on the front , seems to have worked for now ::)
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Ive always rated Missions myself.
Some of the Classics, - Mission, Kef. B&W, Q Acoustics, Quad, Wharfedale, Monitor Audio, Tannoy, to name a few.
For HiFi Speakers, stay away from Bose and anything made in the Far East.
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Model number is S500 .
Cant see any way of accessing the speaker as it all seems to be sealed tight . Oh and they a very heavy :o
Pull the front cover off, there normally screwed in from the front
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Ive always rated Missions myself.
Some of the Classics, - Mission, Kef. B&W, Q Acoustics, Quad, Wharfedale, Monitor Audio, Tannoy, to name a few.
For HiFi, stay away from Bose and anything made in the Far East.
Yes i was looking at Mission :y I will cross off Bose then as i was just looking at those .
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Model number is S500 .
Cant see any way of accessing the speaker as it all seems to be sealed tight . Oh and they a very heavy :o
Pull the front cover off, there normally screwed in from the front
Wont come off ive tried :(
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That's a surprise as the front fabric covered panel usually comes off, allowing access.
I'm not familiar with that model, but heavy is good - suggests a grown-up magnet!
Does the back come off? You might then be able to squiet some clean air into the coil space via a straw from the tin of air?
Ron.
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Model number is S500 .
Cant see any way of accessing the speaker as it all seems to be sealed tight . Oh and they a very heavy :o
Pull the front cover off, there normally screwed in from the front
Wont come off ive tried :(
Try harder, if the box is sealed, ie no screws around the back, the speakers will be mounted from the front.
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That's a surprise as the front fabric covered panel usually comes off, allowing access.
I'm not familiar with that model, but heavy is good - suggests a grown-up magnet!
Does the back come off? You might then be able to squiet some clean air into the coil space via a straw from the tin of air?
Ron.
No access to these im afraid without doing some damage . must be sealed from factory :-\ Ive had speakers you can take the front covers off but these its not possible . Its not crackled yet since blowing in the front 3 holes .
Id estimate these speakers weigh at least 5-8ib each :o :o
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Before doing anything drastic, have you tried swapping the two speakers over side to side to see if the problem follows the speaker or stays on the same side? I'm thinking it could easily be a problem in the electronics.
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Ive always rated Missions myself.
Some of the Classics, - Mission, Kef. B&W, Q Acoustics, Quad, Wharfedale, Monitor Audio, Tannoy, to name a few.
For HiFi, stay away from Bose and anything made in the Far East.
Yes i was looking at Mission :y I will cross off Bose then as i was just looking at those .
I have a pair of Mission 733i floor standers and think they`re great, really good neutral sound to them, perfect partner to my Cyrus Straightline amp 8)
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Lets be honest.
If they are Wharfdale, they need to be older than 20yrs to be anything other than shite... ...and if they are, the speakers are in desperate need of replacement.
Shopping time :D
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http://www.ebay.co.uk/itm/WHARFEDALE-SPEAKERS-S500-Pair-Black-75-Watt-8-ohm-/322308502512?hash=item4b0b1573f0:g:MXEAAOSwPCVX6kND
http://www.ebay.co.uk/itm/75-Watt-8-ohm-WHARFEDALE-SPEAKERS-S500-Pair-Black-/172217990048?hash=item2818fdfba0:g:kuwAAOSwepZXRGw2
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Looking at those eBay photos, you SHOULD be able to remove the front fabric because the drive units are clearly screwed onto the front panel from the front, and how else would you be able to do that if you cannot expose the front panel?
The cabinets appear to be ported, but if you do disassemble them, you still need to seal them properly when reassembling them.
Ron.
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That age speaker will have some sort of tacky gum holding the grill in place, also looking at the ebay pics, it looks as if you can unscrew the rear of the cabinet
try and warm the posts to see if you can loosen the glue with a hair drier, I had a very old set if missions that had this and it wasn't very pretty with the grill removed.
It may not be the coils that are damaged, the surrounds could have rotted causing an imbalance then all you need is new rings, I did a pair of big old jamo's a few years ago and they are still going stong
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http://www.ebay.co.uk/itm/WHARFEDALE-SPEAKERS-S500-Pair-Black-75-Watt-8-ohm-/322308502512?hash=item4b0b1573f0:g:MXEAAOSwPCVX6kND
http://www.ebay.co.uk/itm/75-Watt-8-ohm-WHARFEDALE-SPEAKERS-S500-Pair-Black-/172217990048?hash=item2818fdfba0:g:kuwAAOSwepZXRGw2
Those are the ones rob ;) 6kgs each :o I thought i was just getting weaker ;D
I shall swap the speakers over and see if the noise follows first . No idea how old they are but i'd guess at nearly 20yrs :-\
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That age speaker will have some sort of tacky gum holding the grill in place, also looking at the ebay pics, it looks as if you can unscrew the rear of the cabinet
try and warm the posts to see if you can loosen the glue with a hair drier, I had a very old set if missions that had this and it wasn't very pretty with the grill removed.
It may not be the coils that are damaged, the surrounds could have rotted causing an imbalance then all you need is new rings, I did a pair of big old jamo's a few years ago and they are still going stong
Was looking at those also ;)
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Thia is where I show MY age! Your mention of the age of speakers made me think - my Tannoy Yorks are 44 years old and still sounding wonderful. The bass reproduction is so smooth and understated with not a hint of "one-note-ness". Mind you, it ought to be, as they are the size of a 4 drawer filing cabinet!
I fell in love with them when I heard them demonstrated at the Hi-Fi and Audio show that used to be held annually at the Russell Hotel, London. Anyone else remember that event?
Ron.
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As you get older, an ancient set of speakers compliments that process. As the speakers deteriorate, so does your hearing, so they sound as good as ever. ;D
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Skytronic SHFT60B any good :-\
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Mission, and cyrus, and in its later years whafdale, and maclaren, were manufactured, and assembled in hoof'land.
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As you get older, an ancient set of speakers compliments that process. As the speakers deteriorate, so does your hearing, so they sound as good as ever. ;D
Id like to totally disagree with that, but to be be honest, I cant hear a word your saying.
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Ive always rated Missions myself.
Some of the Classics, - Mission, Kef. B&W, Q Acoustics, Quad, Wharfedale, Monitor Audio, Tannoy, to name a few.
For HiFi, stay away from Bose and anything made in the Far East.
Yes i was looking at Mission :y I will cross off Bose then as i was just looking at those .
I have a pair of Mission 733i floor standers and think they`re great, really good neutral sound to them, perfect partner to my Cyrus Straightline amp 8)
I've got a gorgeous pair of Mission 734's sat at the back of the living room which need 1 (or knowing I should change in pairs, 2) main drivers ;)
Gav if you feel the need for a change, give us first dabs on them please mate :)
I'd love to get them running with my Cyrus 2 again :)
I've been running a pair of Mission M74's for a few years now.
There nice but never a patch on the 734's :'(
Steve (EMD)
I've been running Mission speakers since 1984 when I bought a pair of 1st gen Mission 70's.
As Gav says, match them with the right amp and source and you will be pushed to get a more clean and detailed sound at any price imo :y
My music setup is currently a Mission pcm 700 CD player / Pioneer mini disc player for source.
Cyrus 2 amp and M74 speakers.
AV is Yamaha DSP amp
Mission 760's for front left and right.
Mission 75 C centre speaker and my first purchased 70's at the rear.
As you can probably see, I love Mission / Cyrus stuff ;D
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Ive always rated Missions myself.
Some of the Classics, - Mission, Kef. B&W, Q Acoustics, Quad, Wharfedale, Monitor Audio, Tannoy, to name a few.
For HiFi, stay away from Bose and anything made in the Far East.
Yes i was looking at Mission :y I will cross off Bose then as i was just looking at those .
I have a pair of Mission 733i floor standers and think they`re great, really good neutral sound to them, perfect partner to my Cyrus Straightline amp 8)
I've got a gorgeous pair of Mission 734's sat at the back of the living room which need 1 (or knowing I should change in pairs, 2) main drivers ;)
Gav if you feel the need for a change, give us first dabs on them please mate :)
I'd love to get them running with my Cyrus 2 again :)
I've been running a pair of Mission M74's for a few years now.
There nice but never a patch on the 734's :'(
Steve (EMD)
I've been running Mission speakers since 1984 when I bought a pair of 1st gen Mission 70's.
As Gav says, match them with the right amp and source and you will be pushed to get a more clean and detailed sound at any price imo :y
My music setup is currently a Mission pcm 700 CD player / Pioneer mini disc player for source.
Cyrus 2 amp and M74 speakers.
AV is Yamaha DSP amp
Mission 760's for front left and right.
Mission 75 C centre speaker and my first purchased 70's at the rear.
As you can probably see, I love Mission / Cyrus stuff ;D
Can`t see myself changing them anytime soon Steve, next on the wish list is a Cyrus CD player to compliment my amp :y
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Ive always rated Missions myself.
Some of the Classics, - Mission, Kef. B&W, Q Acoustics, Quad, Wharfedale, Monitor Audio, Tannoy, to name a few.
For HiFi, stay away from Bose and anything made in the Far East.
Yes i was looking at Mission :y I will cross off Bose then as i was just looking at those .
I have a pair of Mission 733i floor standers and think they`re great, really good neutral sound to them, perfect partner to my Cyrus Straightline amp 8)
I've got a gorgeous pair of Mission 734's sat at the back of the living room which need 1 (or knowing I should change in pairs, 2) main drivers ;)
Gav if you feel the need for a change, give us first dabs on them please mate :)
I'd love to get them running with my Cyrus 2 again :)
I've been running a pair of Mission M74's for a few years now.
There nice but never a patch on the 734's :'(
Steve (EMD)
I've been running Mission speakers since 1984 when I bought a pair of 1st gen Mission 70's.
As Gav says, match them with the right amp and source and you will be pushed to get a more clean and detailed sound at any price imo :y
My music setup is currently a Mission pcm 700 CD player / Pioneer mini disc player for source.
Cyrus 2 amp and M74 speakers.
AV is Yamaha DSP amp
Mission 760's for front left and right.
Mission 75 C centre speaker and my first purchased 70's at the rear.
As you can probably see, I love Mission / Cyrus stuff ;D
Can`t see myself changing them anytime soon Steve, next on the wish list is a Cyrus CD player to compliment my amp :y
Thought you might say that ::) ;D
Spares are like rocking horse shite nowdays :(
Been a cheeky bastid and all that, thought I'd try it on ;D ;D
Good luck with the CD hunt :y
Which amp you got ?
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Thanks for that chaps . But i disconnected the speakers and hooked up another known good pair .. still crackling and i think its the actual amp thats causing it :( When you turn the volume button the crackling starts and stops ::) Thats An AKAI M459 so mite start looking for a replacement . Just to add the hifi has been in storage for a while .
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Might I suggest a good dose of switch cleaner on the volume control of the amplifier before you spend too much money? Then work the cleaner in by operating the volume control from end to end (power off!) several times.
If that works, it will be a short term cure until you can replkace the volume control itself.
Ron.
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Might I suggest a good dose of switch cleaner on the volume control of the amplifier before you spend too much money? Then work the cleaner in by operating the volume control from end to end (power off!) several times.
If that works, it will be a short term cure until you can replkace the volume control itself.
Ron.
Thanks ron , yes i have some switch cleaner so will try that first and report back . Didn realise you could replace the control unit , does that have to be soldered in ?
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Yes, soldering required! Does that frighten you? The volume control is usually connected to the printed circuit by wires, so fairl easy, but may sometimes be mounted directly on to the circuit board directly - still not difficult.
These may help:-
https://www.youtube.com/watch?v=9ZxNtxOoeWA
https://www.dropbox.com/s/jikvrckq4b4ucw3/Akai-AM-M459-Service-Manual.pdf?dl=0
Ron.
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Ive always rated Missions myself.
Some of the Classics, - Mission, Kef. B&W, Q Acoustics, Quad, Wharfedale, Monitor Audio, Tannoy, to name a few.
For HiFi, stay away from Bose and anything made in the Far East.
Yes i was looking at Mission :y I will cross off Bose then as i was just looking at those .
I have a pair of Mission 733i floor standers and think they`re great, really good neutral sound to them, perfect partner to my Cyrus Straightline amp 8)
I've got a gorgeous pair of Mission 734's sat at the back of the living room which need 1 (or knowing I should change in pairs, 2) main drivers ;)
Gav if you feel the need for a change, give us first dabs on them please mate :)
I'd love to get them running with my Cyrus 2 again :)
I've been running a pair of Mission M74's for a few years now.
There nice but never a patch on the 734's :'(
Steve (EMD)
I've been running Mission speakers since 1984 when I bought a pair of 1st gen Mission 70's.
As Gav says, match them with the right amp and source and you will be pushed to get a more clean and detailed sound at any price imo :y
My music setup is currently a Mission pcm 700 CD player / Pioneer mini disc player for source.
Cyrus 2 amp and M74 speakers.
AV is Yamaha DSP amp
Mission 760's for front left and right.
Mission 75 C centre speaker and my first purchased 70's at the rear.
As you can probably see, I love Mission / Cyrus stuff ;D
Can`t see myself changing them anytime soon Steve, next on the wish list is a Cyrus CD player to compliment my amp :y
Thought you might say that ::) ;D
Spares are like rocking horse shite nowdays :(
Been a cheeky bastid and all that, thought I'd try it on ;D ;D
Good luck with the CD hunt :y
Which amp you got ?
That`s the trouble with owning some older stuff, spares can become a problem.
The amp is a Cyrus Staightline, it only has input and volume controls, no option to change bass and treble and gives a wonderful neutral sound so you hear the music as it was recorded.
New Cyrus CD players are expensive and also not available in black so won`t match my amp so I might look at second hand stuff next year, I`d also like a Cyrus AV amp but that`s just a pipe dream at the moment ;D
Anyway Steve no harm in asking :y
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Ive always rated Missions myself.
Some of the Classics, - Mission, Kef. B&W, Q Acoustics, Quad, Wharfedale, Monitor Audio, Tannoy, to name a few.
For HiFi, stay away from Bose and anything made in the Far East.
Yes i was looking at Mission :y I will cross off Bose then as i was just looking at those .
I have a pair of Mission 733i floor standers and think they`re great, really good neutral sound to them, perfect partner to my Cyrus Straightline amp 8)
I've got a gorgeous pair of Mission 734's sat at the back of the living room which need 1 (or knowing I should change in pairs, 2) main drivers ;)
Gav if you feel the need for a change, give us first dabs on them please mate :)
I'd love to get them running with my Cyrus 2 again :)
I've been running a pair of Mission M74's for a few years now.
There nice but never a patch on the 734's :'(
Steve (EMD)
I've been running Mission speakers since 1984 when I bought a pair of 1st gen Mission 70's.
As Gav says, match them with the right amp and source and you will be pushed to get a more clean and detailed sound at any price imo :y
My music setup is currently a Mission pcm 700 CD player / Pioneer mini disc player for source.
Cyrus 2 amp and M74 speakers.
AV is Yamaha DSP amp
Mission 760's for front left and right.
Mission 75 C centre speaker and my first purchased 70's at the rear.
As you can probably see, I love Mission / Cyrus stuff ;D
Can`t see myself changing them anytime soon Steve, next on the wish list is a Cyrus CD player to compliment my amp :y
Thought you might say that ::) ;D
Spares are like rocking horse shite nowdays :(
Been a cheeky bastid and all that, thought I'd try it on ;D ;D
Good luck with the CD hunt :y
Which amp you got ?
That`s the trouble with owning some older stuff, spares can become a problem.
The amp is a Cyrus Staightline, it only has input and volume controls, no option to change bass and treble and gives a wonderful neutral sound so you hear the music as it was recorded.
New Cyrus CD players are expensive and also not available in black so won`t match my amp so I might look at second hand stuff next year, I`d also like a Cyrus AV amp but that`s just a pipe dream at the moment ;D
Anyway Steve no harm in asking :y
Sounds like its the replacement for my Cyrus 2 but without the phono pre amp :)
I know what you mean about the Mission AV amp :(
Bloody expensive and then you have to purchase a bunch of power amps too :(
I don't spend the time in front of my speakers that I used to do sadly :( so my little lot will have to make do ;)
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WOW !!!!!! :D :D :D :D :D :D :D
Ive took the Potentiometer out and cleaned with contact cleaner and its working like new . Chrystal clear with no crackling at all ;) Thanks for the tips chaps . What would we do without oof :) :-*
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The cure will not last forever; the control will need to be replaced. Did you note the details on the Potentiometer - value, Part No. etc?
The Akai Part No. is listed in the PDF manual I linked you to, along with the volume control PCB layout - Page 24, bottom right hand corner.
Ron.
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The cure will not last forever; the control will need to be replaced. Did you note the details on the Potentiometer - value, Part No. etc?
The Akai Part No. is listed in the PDF manual I linked you to, along with the volume control PCB layout - Page 24, bottom right hand corner.
Ron.
I forgot :-[ .. but its no problem taking the cover off and checking . I cant see what the actual part number is off that PDF . My old tapes are getting a bashing especially the chuck berry one till the tape all went tight ::)
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I'm glad you've got your music back!
Manual, Page 14:-
8. VOLUME P.C. BOARD
Ref. No. Part No. Description
VR101 EV-383734J VR SPL RK16Y12MAK104X2
[VOLUME]
I cannot find the actual resistance value of the volume control anywhere, but it ought to be marked on the control itself, and will almost certainly be a logarithmic-law potentiometer.
Ron.
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Found it!
Tucked away, not in the main cirduit diagram but a subsidiary one - twin gang 100kilohm potentiometer. It didn't specify logarithmic, but as your ears are logaarithmis, it must be!
Ron.
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Its gone again :(
Only numbers i can see on the board are :
TJE-014V-0
E55879
L241A069H41
Oh and its a motorised volume but i have not got the remote .
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Clean it again Steve ;)
You might be lucky :y
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If the crackling has returned, your volume control is probably beyond help and you need to source a replacement; the motorising bit is irrelevant, as it's just an add-on, yes?
I think the Dropbox version of that manual has parts missing, but I was unable to send the full PDF on here. Go to Akai-AM-M459-Service-Manual.pdf - Adobe Reader. All of those dashes may not be needed, but Google will find it!
It's worth trying eBay, etc., for a generic control as Akai won't be the manufacturer but will want a second mortgage for a replacement.
Ron.
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Could you recommend a replacement part please as i have not got a clue what to order . if its going to cost too much i mite as well buy another amp :-\ i have cleaned it again and all seems well but for how long i dont know :(
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I'll do my best for you, but it would help if you could photograph the control to give me some idea of its physical size and shape, etc. Inclde a small rule in the picture, if possible?
Ron.
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I think the part number you want is number 70 in this list
(http://i111.photobucket.com/albums/n156/stmo987/IMG_0354.png)
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Here is the manual
http://elektrotanya.com/cgi-bin/download2.cgi
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Cancel that, the link doesn't work. Give me a minute.
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http://elektrotanya.com/akai_am-m459_m659.pdf/download.html
You can download it from that page
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This the best I can do. Buy this and cannibalise it:
http://www.ebay.co.uk/itm/AKAI-AM-M459-Stereo-Integrated-Amplifier-Powerfull-/222269319192?hash=item33c048a818:g:MgcAAOSw5dNWrpyp
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That seems like a lot of money to destroy for a less-than-£5 control, STEMO! You have also duplicated all of the information I sent earlier.....
Anyway, it would still be very helpful to have as clear a photo or photos as possible to try to match a generic device from parts suppliers like RS, Rapid, Farnell and the like. Does the control solder directly to that volume board, or is it link-wired to it? It matters because the terminals will be different in each case.
For your information, the control is a 2-gang, 100kOhm logarithmic potentiometer, without switch - they often incorporate a switch to turn an amplifier on, but that wears the control out prematurely and yours, luckily, doesn't do that.
Ron.