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+  MCI Console and Tape Machine Forum
|-+  MCI Consoles
| |-+  JH-600 Series Consoles (Moderator: Westrek)
| | |-+  aux sends
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Author Topic: aux sends  (Read 1226 times)
Berwyn636
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« on: October 21, 2016, 01:36:45 AM »

ALL of my aux sends are noisy all of sudden (sounds like a cap dying but it never tapers off. Like white noise but dirtier) . Aux 1 and 2 being the loudest/noisiest. I thought maybe i fried something on the master module by sending aux 1 to an amp that shorted. But I believe all the auxes have transformers on the outputs no? Regardless, in the expert opinions out there, what could it be?

Ryan
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MCI brown is the new black.
Luddite
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« Reply #1 on: October 21, 2016, 12:05:26 PM »

I've had similar problems in the past.  It usually turned out to be a single channel feeding noise into the bus.
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TonesOnTail
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« Reply #2 on: October 21, 2016, 04:10:40 PM »

I encountered this fairly recently. It turned out to be the ribbon cable connecting the top motherboard for the last bank of input channels to the master motherboard. Channel 36's bus switch sub board was applying pressure to the ribbon cable and was floating the aux common.
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'75 MCI JH16-24 w/ JH114 xport ----- '84 Sony/MCI JH110C-HP 1/4" 2trk ----- '82 MCI JH636-VU-AF
Harrison
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« Reply #3 on: October 22, 2016, 02:29:58 PM »

Luddite is right. One aux master will corrupt the others by feeding its noise back into the Aux ACN common.
Possibly moving each aux master level might make it easier to find which one.
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