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Studer 269 - no signal/microphonic transformer

 
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Lethalgeneshare
audio school


Joined: 23 Feb 2017
Posts: 1

PostPosted: Thu Feb 23, 2017 11:37 am    Post subject: Studer 269 - no signal/microphonic transformer Reply with quote

Got a Studer 269 mixer with one channel giving me trouble and would greatly appreciate any assistance.

So, I plug a mic in and nothing. However, there's a fair amount of noise and the channel strip itself is quite microphonic. If I take a pencil and tap the components, it seems to ring most strongly through the transformer. The EQ section still works (can hear it effecting the hiss) and there is no difference if I disconnect the mic cable. No visible bad connections or caps.

Should I try to track down a replacement transformer? Could this be the result of a bad tantalum cap in there? I see that those little calibration trim pots tend to go bad... Again, I would love to hear any ideas!
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LīAndratté
audio school graduate


Joined: 31 Jan 2013
Posts: 13

PostPosted: Sat Feb 25, 2017 6:29 pm    Post subject: Re: Studer 269 - no signal/microphonic transformer Reply with quote

I donīt know that mixer but itīs very unlikely that a transformer goes bad. Iīd pull the module and check continuity with a voltmeter from xlr pin 2&3 to the transformer input and transformer out to circuit, could be a bad connection!
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