uctpa08 Posted September 19, 2009 Share Posted September 19, 2009 Hi folks, Apoloogies that my first post is a request, but I've searched the site for possible answers to no avail. I have an SM6 and 250 pre-power combination. I was changing the speaker cables on the 250 the other days and unfortunately didn't realise the 250 was still powered up... Idiot... As I took one cable of the terminals, one of the spades touched the casing of the 250 and sparked. Now, the amp still works, on both channels, but I have a problem with a buzz on it. Or more correctly, a fizz (which is what it sounds like). it's there all the time, equally across both channels and invariant to volume. It also only happens when the 250 is connected to the SM6, although the SM6 doesn't have to be switched on. When the 250 is just connected to the speakers and nothing else, no fizz. This seems like a quite specific issue, so I'm wondering whether anybody out there has any advice as to what the problem is (apart from, 'Turn the amp off before you detach the speaker cables'..!). Quite a few people on here seem to be pretty knowledgeable about Perreaux gear so I thought I would ask the experts... I have contacted Perreaux, of course, but haven't received a reply. That's been a feature of previous attempts at communication, unfortunately - after about five emails once, I practically had to beg them to help me out with a problem before getting a response... :-( Anyway, many thanks for reading and here's hoping. Rich Link to comment Share on other sites More sharing options...
Omegaspeedy Posted September 19, 2009 Share Posted September 19, 2009 Hi Rich, I really hope someone here can give you some good advice and I'm sure someone will point you in the right direction. It's extremely disappointing to hear common reports from people regarding not getting a replys back from amp manufacturers here in NZ. Even if they suggest you take it to a dealer or tech at least they SHOULD give a reply. This is what companies need to do to become world class otherwise they will always be light weights in the real world. This problem isn't only here in NZ BTW. As an example of a world class company 'Omega Watch Co' always gets back to you even if it's asking about the history of an old watch you bought in a boot sale. They can tell you when it was made, who it was distributed to, and other useful advise as required. Hopefully NZ can move forward in the customer relations area and get a great reputation for looking after their clients (even if they did stuff up as admitted:)) Link to comment Share on other sites More sharing options...
Shane Hanify Posted September 19, 2009 Share Posted September 19, 2009 Gidday uctpa08, Welcome to the forums. Sorry to hear about that, bet it was a bit of an ouch moment. My first port of call would be swap the source out. Does it happen with another preamp? Sounds like you've shorted something out causing a loop internally. If the buzz isn't there with another preamp, then whistle that off to a good local repairer. If it is, then it's likely to be your power amp, more likely to be in the input stage than not. I'm also sorry to hear that Perreaux have not gotten back to you. It's a bit sad when that happens. I'll have a chat to our local dealer and see if they can shed any light on the matter. Cheers, Shane. Link to comment Share on other sites More sharing options...
got tinnitus Posted September 19, 2009 Share Posted September 19, 2009 Hey Rich It won't be a major issue to repair. Something gone in the output stage I'd say. Find a good tech and they will sort it. However he may have to source a schematic or few from Perreaux so given your experience (and your location), this could be an issue... But give it time.... In my experience Perreaux have been very good at the PR stuff. Link to comment Share on other sites More sharing options...
CoffeeBean1553552729 Posted September 19, 2009 Share Posted September 19, 2009 Just wanted to balance the view on customer service. My recent experience with Perreaux was first class. I requested info on the blue LED in my DAC as I wanted to change it to a green one. I received a green LED in the post a few days later. No charge and friendly, helpful service. Link to comment Share on other sites More sharing options...
Flameboy1553552731 Posted September 19, 2009 Share Posted September 19, 2009 CoffeeBean;103579 wrote: Just wanted to balance the view on customer service. My recent experience with Perreaux was first class. I requested info on the blue LED in my DAC as I wanted to change it to a green one. I received a green LED in the post a few days later. No charge and friendly, helpful service. I second that, good friendly knowledgeable staff with a real passion for what they do. Maybe the email got junked by mistake? I’d try again and see if they’ve got someone in… er wherever ‘London’ is. Link to comment Share on other sites More sharing options...
Shane Hanify Posted September 20, 2009 Share Posted September 20, 2009 got tinnitus;103577 wrote: Hey Rich It won't be a major issue to repair. Something gone in the output stage I'd say. Find a good tech and they will sort it. However he may have to source a schematic or few from Perreaux so given your experience (and your location), this could be an issue... But give it time.... In my experience Perreaux have been very good at the PR stuff. Ooh yeah, output stage not input. Well spotted. Cheers, Shane. Link to comment Share on other sites More sharing options...
Electra Posted September 20, 2009 Share Posted September 20, 2009 I have found that a phone call to Perreaux is a very sure way to get a good answer or good help. Maybe its worth a call to them, even if you have to do it in the middle of your night. Link to comment Share on other sites More sharing options...
Ernie1553552694 Posted September 20, 2009 Share Posted September 20, 2009 Skype is cheap. Link to comment Share on other sites More sharing options...
Declannz Posted September 20, 2009 Share Posted September 20, 2009 output stage? maybe not. since it's playing silly buggers in both channels i'd have thought it to be a power supply issue... then again, I'm not that technically proficcient. try powering the amp up without the pre connected. if it still makes the noise then chances are that it's the power amp. the two best techs that I know of are audio analysis in wellington (goolgle, you'll find him) and there's a guy called Glen on these forums who I know to be a genius audio tech, again in wellington. if perreaux are no help it's worth the tine contacting and freighting to either of these guys. Link to comment Share on other sites More sharing options...
Voxshall Posted May 18, 2011 Share Posted May 18, 2011 I had an amazing experiance with Perreaux. Jon fixed my amp promtly and answered all my stupid questions in a timely manner. Link to comment Share on other sites More sharing options...
Owen Y Posted May 18, 2011 Share Posted May 18, 2011 Hi Rich, In my v little contact I've had w Perreaux, I've found them (Martin) to be most helpful. Personnel & company structure may have changed but I see these 2011 contact details still on the net: Perreaux Industries Ltd. Martin van Rooyen +64 3 489 2975 martin@perreaux.com So I suggest a note to Martin (he is MD) directly, expressing dismay about slow/no response. Technically, I'm not SS expert but this is a MOSFET amp I believe & shorting (or grounding) outputs can be damaging. (I'm thinking that you contacted the -ve cable spade back onto the chassis?) As Declannz sez, it may be a issue common to both ch's...ground-earth filter cap/cct or such Link to comment Share on other sites More sharing options...
Electra Posted May 18, 2011 Share Posted May 18, 2011 Owen, if Perreaux have not yet replied - then thats terribly slow, getting on for 2 years! Link to comment Share on other sites More sharing options...
shotokan Posted May 18, 2011 Share Posted May 18, 2011 Won't be a major, I'm surprised the rail fuses didn't blow first. I mailed Perreraux the other day, got a prompt response, first class service. I would just ring Marty and send the suspect component down for repair. Link to comment Share on other sites More sharing options...
ajst2duk Posted May 31, 2011 Share Posted May 31, 2011 Yeah he's very good in my short experience - I would be confident with Perreaux support Link to comment Share on other sites More sharing options...
aaronelvis Posted June 5, 2011 Share Posted June 5, 2011 I did the same to my 200p and it now has a quiet hum not related to amp voume. I'm keen to hear how your repair goes. BTW the guys at Perreaux were excellent in response to my enquiry. They reccomended I check the rail fuses, which brought the amp back to life. But the hum is beyond my technical ability. Link to comment Share on other sites More sharing options...
Owen Y Posted June 6, 2011 Share Posted June 6, 2011 Hi aaron, Hums like that are often EM (eg. mains AC) pickup or Earth loops, the latter is often quite loud though. I'd check cabling arrangement, esp proximity of signal to power cables. Usually it's better for the above power/signal cables to cross ea other (ie 90deg) rather than be tidily bunched together, parallel...if you can't avoid close proximity. The other thing is good contacts, ie. low resistance contacts...periodically check and clean (if necess) connections...degraded or damaged contacts mean high resistance/impedance which tends to promote noise pickup. Link to comment Share on other sites More sharing options...
aaronelvis Posted June 8, 2011 Share Posted June 8, 2011 There is likely an earth issue in this old house. Link to comment Share on other sites More sharing options...
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