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Author Topic: UA-5 + phantom disaster  (Read 2729 times)

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Offline yousef

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UA-5 + phantom disaster
« on: November 06, 2009, 10:56:02 AM »
I used my Busman-modded UA-5 for a soundboard patch last night and in order to give me a better mix, the soundman plugged an extra lead into the right XLR-in (I had been intending just to use a stereo mix into the RCA-ins at the back).

Unfortunately, today I find that the peak light is constantly lit and the right XLR input is constantly distorted. The other three inputs seem to be working fine.

Would I be right in thinking that this could have been caused by the extra input delivering 48v phantom to the right XLR-in?

And if so, would this be repairable for less than the cost of a replacement box?

I'd guess that the first port of call would be Busman but as I live in the UK, I'd prefer to avoid the headache of trans-Atlantic postage and the risk of being hit for customs charges for an item I already own. So if there is a possibility of it being a user-repair, I'd be keen to hear about it.
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runonce

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Re: UA-5 + phantom disaster
« Reply #1 on: November 08, 2009, 09:32:09 AM »
There shouldnt have been any phantom coming from input he gave you...where did he get the signal from?

And - you should have your phantom off on the UA5 - thats just for microphones - and generally bad for the upstream mixer.

If you had your phantom on - whatever blocking circuitry the board had might have caused your phantom to fry...might want to check with the soundman - ask him about the cable. Maybe had it wired oddly. And ask if he has had any trouble with the output he gave you (he may have some damage if you had your phantom on)
« Last Edit: November 08, 2009, 09:39:11 AM by runonce »

Offline yousef

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Re: UA-5 + phantom disaster
« Reply #2 on: November 08, 2009, 11:04:17 AM »
Thanks for the reply.

There shouldnt have been any phantom coming from input he gave you...where did he get the signal from?


That's a very good point - I'd not been thinking this through properly...

I had my phantom on because it was needed to run an ambient mic the soundman suggested adding in - not something I particularly wanted (as I was running a separate audience tape) but he was so enthusiastic, it seemed rude to decline...

I pointed out that there would also be phantom on the fourth source he plugged in (which I think was meant to be the lead vocal alone) but he plugged in anyway (TRS via TRX>XLR adaptor into my right XLR-in), checked something on the board and was happy to leave it plugged in.

Quote
If you had your phantom on - whatever blocking circuitry the board had might have caused your phantom to fry...might want to check with the soundman - ask him about the cable. Maybe had it wired oddly. And ask if he has had any trouble with the output he gave you (he may have some damage if you had your phantom on)

I think this may be the case. I'm not sure if he'll be aware of any problems with the board as I'm pretty sure he said it didn't belong to him and that he hadn't used it before.

I'm still unsure of the sort of damage that is likely to have occured to my box - a matter of a couple of fried components or will I be looking at replacing ICs?
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Offline mikesalvo

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Re: UA-5 + phantom disaster
« Reply #3 on: December 09, 2009, 10:38:20 PM »
the same exact thing happened to me. I got a board patch, and from then on my peak light was stuck on. That pull actually wound up sounding great. Next few pulls came out fine (although peak light was stuck on), however a few weeks later, there was popping coming through on my tapes. I Sent it to Busman, and it turned out to be a blown op amp. Fix was cheap. Roughly $30 maybe a little more. May want to look into this possibility.

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Offline yousef

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Re: UA-5 + phantom disaster
« Reply #4 on: December 10, 2009, 02:39:54 PM »
Thanks for that.

I actually emailed Busman a couple of weeks ago about this but haven't got a reply yet - I'll definitely try and get in touch with him again. I hope it is as simple as your repair was.

the same exact thing happened to me. I got a board patch, and from then on my peak light was stuck on. That pull actually wound up sounding great. Next few pulls came out fine (although peak light was stuck on), however a few weeks later, there was popping coming through on my tapes. I Sent it to Busman, and it turned out to be a blown op amp. Fix was cheap. Roughly $30 maybe a little more. May want to look into this possibility.

my .02
music>other stuff>ears
my recordings: http://db.etree.org/yousef
http://www.manchestertaper.co.uk
twitter: @manchestertaper

 

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