HH S500d amplifier schematic.H&H repairs.
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Category: Other Chat
Forum Name: Golden oldies
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Topic: HH S500d amplifier schematic.H&H repairs.
Posted By: burningbush
Subject: HH S500d amplifier schematic.H&H repairs.
Date Posted: 18 March 2011 at 12:08pm
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------------- music is the message |
Replies:
Posted By: jbl_man
Date Posted: 18 March 2011 at 12:35pm
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Eh? They said that Gavin? i take it they mean the bottom case panels has rusted,and had caused corrosion inside? ------------- Be seeing you. |
Posted By: burningbush
Date Posted: 18 March 2011 at 12:57pm
Yep, he said there was nothing they could save. This has totally trashed my plans and my racks. . Had planned on using them for midrange, do not know what to use now. Still can not believe there was nothing salvageable out of three amps - he did say he could build one from scratch for about £600 - but everything was too far gone.
I can't see myself finding another two of them, so maybe I'll go with some 800b or c.
Och-well, back to the drawing board - maybe I'll wake up and it will be just a bad dream.  ------------- music is the message |
Posted By: jbl_man
Date Posted: 18 March 2011 at 1:14pm
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Gosh no,rediculious,why would anyone want an s500d standing them in £600?
Is this anygood? awful photos by the way.
http://cgi.ebay.co.uk/HH-Electronic-S500D-Amplifier-/180640285778?pt=UK_MusicalInstr_Amplifiers_RL&hash=item2a0f000452 - http://cgi.ebay.co.uk/HH-Electronic-S500D-Amplifier-/180640285778?pt=UK_MusicalInstr_Amplifiers_RL&hash=item2a0f000452 ------------- Be seeing you. |
Posted By: GregM
Date Posted: 18 March 2011 at 1:41pm
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Gavin,
It maybe worth dropping Mhamplifiation a message, he's a bit of a handy one when it comes to salvaging amps - and has a particular soft spot for HH.
Maybe be could 'salvage' a few of the channels from the lot which isn't cost effective for Maj to suggest?
Greg ------------- Remember, if you don't want to hear the answer, don't ask the question! |
Posted By: burningbush
Date Posted: 18 March 2011 at 1:54pm
Wow, thanks for the suggestions, will have a pop at that listing Ian and if that doesn't pan out I'll go for sending them around the country .------------- music is the message |
Posted By: colint
Date Posted: 18 March 2011 at 3:07pm
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I was hoping no one had noticed that one? Looks like a bid war coming! ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: colint
Date Posted: 18 March 2011 at 3:09pm
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Why not let service dept Steve have a look at your s500s? He may be able to do something with them! ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: burningbush
Date Posted: 18 March 2011 at 3:11pm
Bring it on Colint  , truth be told I was going to send you amp #3 as a surprise when I got them back - but obviously that is not happening. Sure you wouldn't like a V800 better?------------- music is the message |
Posted By: colint
Date Posted: 18 March 2011 at 3:15pm
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I've already got 3 v800's and 1 v500 but they take up to much rack space on my little system, I have 3 s500's but need the 4th to complete the rack. ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: Mhamplification
Date Posted: 18 March 2011 at 3:22pm
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Burning bush please read a message I have sent you You may find it interesting MH |
Posted By: burningbush
Date Posted: 18 March 2011 at 5:01pm
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Seen. Will update as it unfolds. ------------- music is the message |
Posted By: service dept Steve
Date Posted: 19 March 2011 at 10:14am
I too can't believe that all three are beyond repair, Anyway, the lids are aluminium, you sure your chain isn't being yanked? (As an Alfa owner one needs to define "corrosion"  )------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
colint wrote:Posted By: colint
Date Posted: 19 March 2011 at 10:50am
It just seemed strange to me that a company that supplies parts for these amp's would right off 3 of them and not be able to do any repairs at all! I wonder how much those amps would be worth if broken up for parts? ie 6 modules @ 60 quid ect I think I'd be looking for a second opinion. ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: jbl_man
Date Posted: 19 March 2011 at 11:19am
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Colin,i have also heard similar stories about the same company,and i believe Martin has as well.
I make you absolutely right regarding getting a second opinion. ------------- Be seeing you. |
Posted By: colint
Date Posted: 19 March 2011 at 11:41am
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£116 for a module from them exchange Mmmm. I was going to buy some knobs to replace the nasty thing someone had fitted to one of my amps they were £1 each and £3 each for postage and I seem to recall a minimum spend too (it was a year or so ago) They also told me the Electroluminescent panel's were not repairable/available but Steve managed to get mine going using led's works a treat if not better than the originals. ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: service dept Steve
Date Posted: 19 March 2011 at 12:59pm
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I can't believe that someone would do that, I have heard stories about guitar amp repair shops swapping out all the mullards and filling them with Chinese nasties and swapping bits of instruments but never with someone who's been in the business for years. My dishonesty only stretches as far as telling customers that a repair has taken a couple of hours when in reality I've spent all day starring at the same circuit board but don't want to look like a numpty so I always find these stories distressing. I am halfway through rebuilding one for Colin, the repair involved removing the circuit board from it's resin and repopulating the board. Not beyond repair by any means and not 600 sovs either. Do I remember correctly that "grumpy" said he had some NOS boards in one of his many sheds? I too would be interested in getting/giving a second opinion but am also intrigued by :
------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: MattStolton
Date Posted: 19 March 2011 at 1:27pm
I hear your pain, my DM flywheel and clutch have just gone south.........The vibration finished off my top engine mounts, both ends....bugger. Back to point, which bit is suffering from metal maggot? I am sure, even with the UK's depleted manufacturing base, metal can be folded and painted/coated to match original by someone for reasonable chunks of wedge? I have had loads of "things" knocked up by metal factors for not a lot, for example, Brembo Two pot calipers, got the last genuine pots/seals in the UK, and then had a little local metal worker to knock me up the pad retaining springs, pins, and even bleed screws! Some alloy wheel centering rings too, and change from £80. Beautifully done in stainless and sprung stainless. Does smell a little whiffy..... ------------- Matt Stolton - Technical Director (!!!) - http://www.wildingsound.co.uk" rel="nofollow - Wilding Sound Ltd "Sparkius metiretur vestra" - "Meter Your Mains" |
Posted By: burningbush
Date Posted: 19 March 2011 at 2:30pm
This is what one looked like before sending:
 ------------- music is the message |
Posted By: colint
Date Posted: 19 March 2011 at 4:24pm
Could have done with a bigger picture, but apart from a little discolouring on the transistors it doesn't look that bad to me! I've certainly seen a lot worse! ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: jbl_man
Date Posted: 19 March 2011 at 5:35pm
Well seeing that photo,if the repairer said " dead with nothing salvageable cause red rust took hold underneath" then in my opinion he is either incompetent,or is having a giraffe. ------------- Be seeing you. |
Posted By: service dept Steve
Date Posted: 19 March 2011 at 7:07pm
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It is very easy to jump to conclusions (in this case very easy) but that doesn't look too bad to me. Question: Does burningbush look like a bitch? ------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: Nachural
Date Posted: 20 March 2011 at 10:47am
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Interesting, MAJ are usually pretty on the ball with HH stuff but it's always worth getting a second opinion. Also worth checking out the MAJ website http://www.majelectronic.co.uk/ - http://www.majelectronic.co.uk/ quite a funny read in places from a guy whe definitely says what he's thinking! ------------- it's all just cardboard and magnets really |
Posted By: service dept Steve
Date Posted: 20 March 2011 at 10:58am
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"Please
be wary of what you read on the FORUMS
These are generally populated by people who know absolutely nothing about any technical or SAFETY aspect of electronic or audio engineering and are advising other members who probably know even less."
------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: service dept Steve
Date Posted: 20 March 2011 at 10:59am
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None taken....
------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: Muckerbarnes1
Date Posted: 20 March 2011 at 12:25pm
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I believe 'chain yank' to be the phrase here.
What a load of red rust bollards..... ------------- Billy Dawg. |
Posted By: jbl_man
Date Posted: 20 March 2011 at 12:39pm
Quite funny really. ------------- Be seeing you. |
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Posted By: Nachural
Date Posted: 20 March 2011 at 2:20pm
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More of a rant than a website really and a very interseting slant on how to endear yourself with the customers! ------------- it's all just cardboard and magnets really |
Posted By: jbl_man
Date Posted: 22 March 2011 at 2:16pm
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Gavin,what was the outcome of this? Have they agreed to send them back to you yet? ------------- Be seeing you. |
Posted By: imageoven
Date Posted: 23 March 2011 at 11:48pm
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If you need another option, I've rememberd another H&H (V900?) which may well still be tucked away in an amp rack near you (Scottish near, not English near). pm me if you fancy a treasure hunt.
------------- Keep pushing on, things are gonna get better. |
Posted By: burningbush
Date Posted: 24 March 2011 at 3:54pm
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So, I am just waiting for the amps to return via courier. I will open them up to confirm original contents and will post to update...wish me luck. ------------- music is the message |
Posted By: colint
Date Posted: 27 March 2011 at 2:48pm
I won this one (sorry Gavin) and yes it's very good! Had to sell a V800 to get it but got it home opened it up and this is how it looks inside!    Already modified with soft start and speaker protection very clean inside and out with very little rack rash and all working including the green lighty up front panel, probably the cleanest S500 I've seen for many years. The seller (Fairfied halls) is like an Aladdin's cave so may be worth adding as a fav seller (My eye's nearly popped when I saw all the gear in that room!) they have loads of kit going on the bay including loadsa HH M900's 2-3 pea soupers, revox B77 (15ips) outboard stuff and loads more! ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: burningbush
Date Posted: 28 March 2011 at 2:43pm
Nice one Colin, looks like you scored a beauty there - and working front panel.....where do you live again? ------------- music is the message |
Posted By: colint
Date Posted: 28 March 2011 at 6:10pm
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The Electroluminescent panel could well be up for sale as service dept Steve has already modified one of my S500's with the green LED thingy he does, so I'd want them all done the same, I'm also looking at Steve using the green light panel to indicate when the amp goes into protect, ie when it goes out the protect is on and green for go! did you get your amps back yet? ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: service dept Steve
Date Posted: 28 March 2011 at 7:21pm
Turns orange more like... ------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: colint
Date Posted: 28 March 2011 at 7:46pm
I just know you can make this work  new amp has one of these fitted. http://www.velleman.eu/downloads/0/illustrated/illustrated_assembly_manual_k4700_rev1.pdf - http://www.velleman.eu/downloads/0/illustrated/illustrated_assembly_manual_k4700_rev1.pdf it seems like an ok unit but only time will tell! Tea and bun's this week depending if I get sent your way! ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: burningbush
Date Posted: 30 March 2011 at 1:41pm
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Got the amps back yesterday, all the internals have been put in different boxes, all the cables have been cut.
Just recap, I sent 3 amps for repair/service at MAJ electronics. They were to phone with a quote for repair. No phone call or consultation - all three amps were stripped out for spares and chassis thrown in bin. I phone and am informed they have been condemmed and I am due him for mornings labour!
Now I need to send them (again!) down the road to MHamplification before he (MH) has realised what he has agreed to . Some where in the distant future there will be an amp waiting.------------- music is the message |
Posted By: burningbush
Date Posted: 30 March 2011 at 1:43pm
I think an orange panel for fault would be the height of sophistication. Very cool. ------------- music is the message |
Posted By: Nachural
Date Posted: 30 March 2011 at 1:52pm
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Thats terrible. Did MAJ send all of the part back including the chassis? They aren't his to throw away and surely if he was just quoting prior to repair he can't charge for labour??? ------------- it's all just cardboard and magnets really |
Posted By: service dept Steve
Date Posted: 30 March 2011 at 2:04pm
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Mate, If you don't phone him and call him a cvnt then you have got anger issues, if I had done that I would expect a knock on the door (which I would deserve) does he call himself a professional, because that isn't what he sounds like. I feel sick. ------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: Nick Sasquash
Date Posted: 30 March 2011 at 2:04pm
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Thanks for the update Burning Bush.... wow.... just can t believe some people, the ultimate in pis poor service! I wish i could be as calm about shite like this as you are, fair play to ya.... What i dont understand, why.... just how much work will MAJ electronics be loosing from this i wonder. ------------- https://operationsoundsystemrecords.bandcamp.com/ https://www.facebook.com/OperationSoundSystem/ |
Posted By: service dept Steve
Date Posted: 30 March 2011 at 2:23pm
If we all google the whole phase "how much work will MAJ electronics be loosing from this" it will be top of the list in no time, then, hopefully the answer will be "all". Nobody needs people like this. ------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: biotec
Date Posted: 30 March 2011 at 2:38pm
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That's outrageous. I would send MAJ the bill for getting the amps back into a working state. ------------- me so horny, me love you long throw. |
Posted By: colint
Date Posted: 30 March 2011 at 3:18pm
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I don't know why but I expected something like that to happen! just seemed odd to me that a company that is a spare parts specialist for HH would write off 3 amp's? Nice amount of profit in parts just sitting there in that scrap bin, I wonder how many people have fallen for that one! He won't get any trade from me that's for sure! Disgraceful I hope your going to tell him to f off regarding his "Bill" ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: burningbush
Date Posted: 30 March 2011 at 3:46pm
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Had to pay 1 hr to ensure that I got everything back, but yes I did not expect that.
I thought here is someone who loves old gear, seems to be the main HH guy, surely has to be him I send stuff to as he has got plenty spares...mmm. At over £100 an output module, yes I just sent him well over £600 in spares for him to use for free. Plus the enormous toroid, large caps, etc.
First day was shock, second day very angry but had to bite my tongue, now just sick and diappointed.
All my work is unpaid charity gigs, so it is a very low down thing he tried to do.
I received three chasis with modules back in diferent order and no connections. Whether they are the same modules we will have to wait for testing.
I have a lot of love for this forum and those on it, more so since this has happened and seen peoples concern and offers of assistance.  Thankyou guys, I might get the system running again soon.------------- music is the message |
Posted By: jbl_man
Date Posted: 30 March 2011 at 3:49pm
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Truly awful service Gavin.
Well we will all know who not to recommend for HH spare parts in the future....this question does come up on this forum a fair few times,so it would probually be wise to point anyone asking about HH spares/repairs to this thread.
Edit...
By the way,i have the HH S500d schematic here (which he probually charges for) so if anyone wants it for free let me know.  ------------- Be seeing you. |
Posted By: djeddie
Date Posted: 30 March 2011 at 3:55pm
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Is it worth either making this a 'sticky' or similar? Edit: Oops, meant to add fairplay on keeping cool. Personally I would've driven there and probably driven through his front door... and taken a 'mate' who would've demolished his back door.  ------------- Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB |
Posted By: jbl_man
Date Posted: 30 March 2011 at 3:58pm
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What i will do Eddie is change the thread title,so it will show up in a google search about this amp. ------------- Be seeing you. |
Posted By: djeddie
Date Posted: 30 March 2011 at 4:02pm
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Cheers Ian, I haven't got S500's but it's definitely worth warning people (for want of a better phrase) about Maj and their version of "customer service".
------------- Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB |
Posted By: jbl_man
Date Posted: 30 March 2011 at 4:10pm
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HH s500d Schematic is here.
http://www.soundservicesni.co.uk/downloads/schematics/S500-D.pdf - http://www.soundservicesni.co.uk/downloads/schematics/S500-D.pdf
------------- Be seeing you. |
Posted By: burningbush
Date Posted: 30 March 2011 at 4:34pm
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Very good Ian, on the ball as always.
As for keeping cool, obviously I wanted to take a trip to put my view to him personally - but I wanted the amps back more. I used to recommend them to everybody aswell, but not now. ------------- music is the message |
Posted By: GregM
Date Posted: 30 March 2011 at 8:52pm
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Gavin,
What a seriously sad tale of a supposedly 'specialist' repairer, clearly caught out 'legging' a punter - I ask just how many people actually intent on genuinely repairing anything start off by cutting through the interconnecting cabling??
As a big fan of the classic HH gear I for one, am absolutely delighted you decided to post your original 'noooooooo' message on here - well and truely alerted thanks.
Do package up the remains to MHamplification, he's a good'un - but do me a favour eh?, wait a week or two, he's got a comparatively very dull job to sort out for me first!
Greg ------------- Remember, if you don't want to hear the answer, don't ask the question! |
Posted By: Muckerbarnes1
Date Posted: 30 March 2011 at 9:25pm
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Sad news there Gavin.
Agree with Steve. What a cVnt.
I do hope we all get to put the boot into MAJ. What an arsehole...
Keep posting guys and searching. ------------- Billy Dawg. |
Posted By: burningbush
Date Posted: 31 March 2011 at 10:47am
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very good Greg, I didn't realise there was a queue. Poor MH. I will have to send him some whiskey! ------------- music is the message |
Posted By: Mhamplification
Date Posted: 31 March 2011 at 11:09am
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Hi Ian can you let me have the S500d schematics as I am going to have a look at these amps for Gavin I have all the other schematics but not the S500d Thanks Martin Truly awful service Gavin.
Well we will all know who not to recommend for HH spare parts in the future....this question does come up on this forum a fair few times,so it would probually be wise to point anyone asking about HH spares/repairs to this thread.
Edit...
By the way,i have the HH S500d schematic here (which he probually charges for) so if anyone wants it for free let me know. [/QUOTE]
|
Posted By: Mhamplification
Date Posted: 31 March 2011 at 11:12am
| Sorry Ian just seen the link on previous page |
Posted By: jbl_man
Date Posted: 31 March 2011 at 11:15am
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HH s500d schematic. H&H. HH ELECTRONIC.
http://www.soundservicesni.co.uk/downloads/schematics/S500-D.pdf - http://www.soundservicesni.co.uk/downloads/schematics/S500-D.pdf
 Dont worry Martin,the more we post it,the more it will show up on a google search. ------------- Be seeing you. |
Posted By: Mhamplification
Date Posted: 31 March 2011 at 1:05pm
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I dont drink Gavin but like Mars bars or some nice Arbroath smokies !!! Ive just taken some pics of my S500d will be in a email later this afternoon Martin |
Posted By: burningbush
Date Posted: 31 March 2011 at 3:04pm
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Arbroath smokies are possibly the best fish ever! mmm straight from the smoking barrel, piping hot, nothing else touches it. This I can supply, any other treats? Haggis, skirly? Deep fried mars bars?
Do you have a garden, need seeds? ------------- music is the message |
Posted By: Grumpy
Date Posted: 03 April 2011 at 5:24pm
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Shit have only just seen this post (not been on the forum for a while due to a family bereavement that’s sort of F**ked my head) I’ve known Mike (MAJ) for 25+ years and am totally shocked by his actions regarding this; he is not the first (or the last) to go bad in this industry. I do have got quite a lot of 500D bits somewhere buried, but I can lay my hands on a pair of driver boards fairly quickly if anyone needs them in a hurry. Not on the forum that much as things are still a bit weird here but you can mail me at mailto:scott@chasesound.co.uk - scott@chasesound.co.uk if you need the boards |
Posted By: Nachural
Date Posted: 03 April 2011 at 6:47pm
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It's true, the guy used to have a good rep locally but this lot was shocking. ------------- it's all just cardboard and magnets really |
Posted By: Satyr Icon
Date Posted: 18 April 2011 at 9:02am
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Greetings All, Just typed HH S500-D into GooG box looking for DC protection boards for thse amps and found this discussion. I can hardly believe what I am reading about Mike at MAJ Electronics. Are you all sure you are talking about the same guy. ??????? Sounds like he took a couple of months off and left someone else in charge. I run four of these amps for 25 years and apart from their occasional DC habit they are not destroyable by mere mortals, it takes at least an act of GOD. The question is, is someone at MAJ playing God. ------------- Disaster follows disaster, at first just fast, and then, faster and faster. (Edgar A. Poe) |
Posted By: burningbush
Date Posted: 27 April 2011 at 3:28pm
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Well I just spoke to an engineer I sent them to, he says that there is fresh solder in there with alot of broken pieces - looks very much like the good parts have been swapped out. Will have to confirm, but looks pretty bad. Nobody could be more shocked than me, I've recommended this guy before aswell. ------------- music is the message |
Posted By: jbl_man
Date Posted: 27 April 2011 at 4:43pm
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You will need to confirm all that Gavin,but i think we can all read between the lines,i take it your original modules have been swapped over for busted ones? Lets not mess about,for swapped over read stolen?
------------- Be seeing you. |
Posted By: djeddie
Date Posted: 27 April 2011 at 5:01pm
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Well if they have been changed surely that's theft, a criminal offence. If it was me I'd get the engineers report and go and see the Police. Bang out of order! ------------- Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB |
Posted By: Muckerbarnes1
Date Posted: 27 April 2011 at 5:13pm
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Can you get us some pics? i'e' close up as to see and confirm.
------------- Billy Dawg. |
Posted By: colint
Date Posted: 27 April 2011 at 7:28pm
That is pretty damm disgraceful! of all the low underhand things to do! Totally shameful, I think I'd rather sell off all my S500's and V series amp's than go there for parts again. I wonder how many other's have fallen for this?  ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: colint
Date Posted: 27 April 2011 at 7:31pm
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Be interesting to send another one there but treated with this first! http://www.smartwater.com/Personal/Products.aspx - http://www.smartwater.com/Personal/Products.aspx But then he has probably seen this thread by now! ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: GregM
Date Posted: 27 April 2011 at 8:46pm
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Oh,
This sad tale just gets worse - now with the discovery of the boards having been tampered with, suggesting an even more sinister undertone/crime having been on going.
I for one am hugely indebted to Burningbush for sharing this with us - if nothing else we all know who to avoid for anything HH - and sinceely hope to hear sometime soon that he has 3 fully operational S500's....somehow!..
Greg
------------- Remember, if you don't want to hear the answer, don't ask the question! |
Posted By: Nachural
Date Posted: 13 May 2011 at 12:10am
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Any updates regarding the amplifiers? ------------- it's all just cardboard and magnets really |
Posted By: Mhamplification
Date Posted: 09 June 2011 at 5:11pm
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Just wanted to say I have one of your amps up and running as i type this Im chuffed as **** Never thought they would work again Gavin it is the one that I called amp 1 the one that looked most original Supply caps replaced and bridge rectifer was shorted amp is running on the bench with output modules haging out of the case |
Posted By: jbl_man
Date Posted: 09 June 2011 at 5:27pm
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Martin 1. MAJ 0. ------------- Be seeing you. |
Posted By: colint
Date Posted: 09 June 2011 at 8:35pm
Don't you just love it when a plan come's together! ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: Nachural
Date Posted: 09 June 2011 at 9:17pm
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Brilliant news, just goes to show how wrong MAJ was. ------------- it's all just cardboard and magnets really |
Posted By: service dept Steve
Date Posted: 10 June 2011 at 8:24am
Hmm, Not sure about that, sounds to me as if MHamplification has had to put quite a lot of work into this. ------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: jbl_man
Date Posted: 10 June 2011 at 8:40am
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Well if the original repairer cant deduce that it needed supply caps replaced and bridge rectifer was shorted ,then he isnt the sort of man you want working on your equipment.......especially as the guy was meant to be an "expert" on this make.
------------- Be seeing you. |
Posted By: Nachural
Date Posted: 10 June 2011 at 9:20am
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Absolutely Ian. I would have expected MAJ to have been a bit more specific about the problem. After all, it's a bog standard PSU, not a super complicated switchmode jobbie. ------------- it's all just cardboard and magnets really |
Posted By: Mhamplification
Date Posted: 10 June 2011 at 9:23am
Thats true ive used parts from all 3 amps and spent 12-15 hours so far on it so not exactly a easy job But Gavin did say all 3 amps did work before all this started |
Posted By: burningbush
Date Posted: 10 June 2011 at 1:53pm
Martin you are a hero, from the collection of random bits that were returned to me you have brought life!!!  ------------- music is the message |
Posted By: Mhamplification
Date Posted: 10 June 2011 at 2:08pm
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Think I can make another good one as well Have 2 more modules working on test See email I have just sent you Martin |
Posted By: service dept Steve
Date Posted: 10 June 2011 at 2:29pm
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When you get to the last one let us know, between us we must be able to drum up enough bits to get one more going. Am I right in assuming that the modules have turned from unsealed, working ones into sealed broken ones from the simple action of posting these to Maj? I do have a circuit board from one of Colint's that I have had to remove from the potting compound, I can get a scan of it if you need to copy it. S ------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: Mhamplification
Date Posted: 10 June 2011 at 3:22pm
Steve The modules are not sealed but just have plastic covers on them or some of them One of the good working ones has no cover at all So I presume it has been worked on before A lot of the modules have 2N3773 power transistors in them too Do you know if that was a replacement for the H/H9080 that is surposed to be in there the 2N3773 are commonly used in most other H/H amps ie the IC100 etc All the parts on the modules seem to be easily available so dont see why they cant be fixed as well All the amps seem to need new supply caps though all of them have new shiny nuts and bolts on them so guess the good ones have been robbed out |
Posted By: service dept Steve
Date Posted: 10 June 2011 at 4:05pm
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2n3773 (and sometimes 2n3772(bit too low voltage for my liking)) are used in a lot of the larger HH amps, some of the smaller ones, the 100w version for example, used a darlington transistor, mj11016 was used in place of HHXP2 IIRC. I'm thinking that a more modern transistor like MJ15024 would work just as well in place of the 2n3773 and might even improve things a little. The weak spot on those modules was a to39 transistor, 2n5415, this was also the weak spot on the venerable Turner B500 studio amps, of which we used to have loads and so I still have plenty of these transistors in stock. the op amp (part number escapes me for the moment) will be more difficult to trace, but hopefully will be alright, I have one in stock and that was bought on eBay for a pile of dough as it is the weak spot on the good old DC300A. As you don't have sealed units there the problems are purely electronic (assuming the tx is ok) and there should be plenty of scope for capacitors as they lay down in this design giving plenty of room. Give me a shout if you need me to send anything over Steve ------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: Mhamplification
Date Posted: 11 June 2011 at 1:11pm
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Thanks for the info Steve To finish the 3 one I need 2 more working modules 1 has +20volts of Dc on the output the other is very low power Maybe just an op device failed I have another amp for spares that I can use the caps from and few other cosmetic bits I think the iC you mentioned is the RC4739 I Have a spare transformer as well If that is open circuit on the 3rd one |
Posted By: service dept Steve
Date Posted: 11 June 2011 at 4:40pm
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Doesn't sound to bad then, These modules are a very simple design and shouldn't give you any problems repairing them, Not to tell my Grandmother how to suck eggs but that TO92 transistor mentioned further up this thread is the first one to check, if the base has blown off it (fav) that would make the output hang about the 20v mark. Anyway, you know what you're doing.
------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: Mhamplification
Date Posted: 11 June 2011 at 5:08pm
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Previous picture is the first amp on test Modules outside the case makes it easier to work on Thanks Steve for input I will check out those dud modules next week |
Posted By: burningbush
Date Posted: 13 June 2011 at 11:54am
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That beats a carpet tile hands down - classy
------------- music is the message |
Posted By: madboffin
Date Posted: 18 June 2011 at 5:31pm
Hi Steve, Just out of interest, do you know what the original part numbers were for the driver transistors in the Turner B series? I am aware that the outputs were selected & badged 2SD424's, but never found out what the drivers were... |
Posted By: Nachural
Date Posted: 18 June 2011 at 6:08pm
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Turner power amps, now that's a blast from the past. Well respected and solid, rivalled RSD's at the time. ------------- it's all just cardboard and magnets really |
Posted By: colint
Date Posted: 18 June 2011 at 6:17pm
Nice rug, I wish my work space was as tidy as that  ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: service dept Steve
Date Posted: 19 June 2011 at 10:42am
I've had the same mobile for 20 years and have no idea what the number is, I have such a bad memory. IIRC the output devices usually were replaced by 3773's but I can't remember what the drivers were although I have a vague feeling they were a tip series to220 so could have been tip41/tip42 but don't hold me to that. Did I say I have a bad memory? ------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: spkrparts
Date Posted: 23 November 2012 at 5:30am
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Hey Ian, just had a channel of my S500 go down and was wondering if you can send me a copy of the schematic you mentioned. Also I'm looking for a spare output module and Perspex front if any of you lads know where these parts may be hiding. Cheers!!! |
Posted By: colint
Date Posted: 23 November 2012 at 3:04pm
Shame you so far away I have 2 fully working almost as new examples I'm going to sell after Christmas. you'll have very little chance of getting the front panel unless you can find a breaker. ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |
Posted By: Nachural
Date Posted: 23 November 2012 at 3:19pm
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MAJ Electronics in Kingswinford possibly for perspex replacement of EL front pannel (requires LED illumination I understand because original EL panels are no longer available) http://www.majelectronic.co.uk/ Cavaet Emptor ------------- it's all just cardboard and magnets really |
Posted By: service dept Steve
Date Posted: 23 November 2012 at 3:30pm
Read the rest of this thread first would be my advice. ------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: Nachural
Date Posted: 23 November 2012 at 3:36pm
Steve Absolutely, ------------- it's all just cardboard and magnets really |
Posted By: colint
Date Posted: 23 November 2012 at 4:55pm
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Cavaet Emptor without doubt very sketchy goings on. ------------- Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes! |