Studer 269 - no signal/microphonic transformer

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audio school
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Joined: Thu Feb 23, 2017 7:25 am

Studer 269 - no signal/microphonic transformer

Post by Lethalgeneshare » Thu Feb 23, 2017 7:37 am

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!

audio school graduate
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Joined: Thu Jan 31, 2013 3:26 am

Post by L?Andratt » Sat Feb 25, 2017 2:29 pm

I don?t know that mixer but it?s very unlikely that a transformer goes bad. I?d 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!
Strictly amateur

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