OBERHEIM SYNTH

I have a bunch of vintage gear in my gig rack, including a Matrix  
1000, MKS-70, Yamaha TX802. When we did a big gig with a concert PA  
for the first time, the sound guy had to put a noise gate on the mix  
out. I hardly noticed it before because my club PA didn't have nearly  
as much gain. "Old school gear is noisy" the sound guy said, "but it  
sounds awesome."

Stublito

Quoting les_lmbrt <les_lmbrt@...>:

> It doesn't seem likely from what you say. that there is anything you  
>  can or should do to the insides of your Matrix. The change of mixer  
>  may mean you've changed the gain structure in this part of your   
> setup, possibly the impedances are altered too.
> Try comparisons with another one first, it may be normal behaviour   
> in ths new setup, it may be some grounding issue within the Matrix,   
> or a factory mod that hasn't been carried out correctly, or at all.
> The leaking of generator noise is a feature of the Hammond by the   
> way, we all love it, but some are worse than others, nobody persues   
> this.
> If you're determined to have a look, look for signs of poor   
> connections to ground, have a look at the schematic, look at how   
> many connections to ground there are and consider how the noise   
> might be re-entering the audio circuits before you get the thing open.
> This capacitor replacement fetish does have a basis in fact, old   
> analog equipment tends to heat capacitors up, and modern equipment   
> has in some cases been built with caps that don't quite do what it   
> says on the tin for quite as long as we'd hoped. Substitution of   
> parts often helps, but it's not where you start.
>
> Unless your standard of workmanship is very high, and you're very   
> careful and well organised, you're quite likely to lose what you   
> have, a working keyboard, and gain a large bill for a much more   
> serious repair.
> The Matrix may or may not have a fault but I believe it's like your   
> car, you need to take it to an experienced person. If you're lucky   
> enough to find one.
> The techniques required for repairs to synths are not something   
> you're likely to find by accident and enthusiasm.
> In the days of point to point wired hand made guitar amps, there was  
>  a chance to learn by doing without too much chance of doing damage,  
>  but the Matrix isn't that kind of animal.
> Trying to fix it by guesswork, even communal guesswork with well   
> meaning helpers, does sometimes work, but if it has a proper fault a  
>  proper repair is what it needs. I understand these talented repair   
> people are hard to find, but the more people that make the effort to  
>  look for them and share their positive experiences, the more   
> technical support people will stay in the business.
>
> On a more cosmic level:
> To get the answer, we must formulate the question.
> Electronics fault finding is a What question, not a Why question.
>
> Often the fault is something minor or imaginary,and with the casting  
>  of a professional eye you might get news of some impending disaster  
>  that will save you a small fortune, the rattling noise that's the   
> mains transformer colliding with the main processing board after the  
>  bolts sheared off for example.
>
> Turning up the drums isn't that bad an idea too.
>
> --- In oberheim@yahoogroups.com, "eightiescrisis" <eightiescrisis@...> wrote:
>>
>> Recently upgraded my mixer, and now I notice my Matrix 6R is fairly  
>>  noisy.  It seems to have a low level noise and synth rumble on all  
>>  the patches.  What's unique is that the sound changes from patch  
>> to  patch, but is always there.  You can here it when the synth is  
>> not  being played, and I've even removed the midi cable, and turned  
>>  everything else off, just the module and the mixer........
>>
>> I guess I could turn the main volume down on the unit, but is there  
>>  something else I could do?
>>
>>
>> Should I replace the caps, and where are they and what do they look like?
>>
>> Is this common?
>>
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