TC-50 humming

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ochrisl
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TC-50 humming

Post by ochrisl » Mon Apr 16, 2018 7:37 am

My TC-50 has a noticeable hum. Sounds like the transformer humming.It is noticeable When I flip the switch up on channel 2 an 3. If the gain is past 12 oclock it is pretty loud. If I dime the gain on channel 3 the hum is ridiculously loud. I tried changing all tubes and bypassed loop,reverb and boost. Also tried different cables.no cables and the result is always the same.Is this normal. Does your TC-50 have a hum?
Here is a video, this is with the master at noon.

https://www.youtube.com/watch?v=oXjichktVPU

bandit2013
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Re: TC-50 humming

Post by bandit2013 » Mon Apr 16, 2018 6:46 pm

That does not sound normal.

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screamingdaisy
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Re: TC-50 humming

Post by screamingdaisy » Mon Apr 16, 2018 11:24 pm

You have any fluorescent lights or a refrigerator nearby?
Ignore the hype and trust your ears. Play more, buy less = better tone.

bandit2013
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Re: TC-50 humming

Post by bandit2013 » Tue Apr 17, 2018 5:59 am

I looked at the video again and notice I run my masters and gain settings much higher that what you have in the video.

Call Mesa Tech support ! That sound is not normal.

ochrisl
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Re: TC-50 humming

Post by ochrisl » Tue Apr 17, 2018 8:58 pm

I had moved it to another circuit in the house, it made no difference. I've played lots of different amps in the same rooms and never had noise issues like this.
I talked to Mesa and sent them the video. They agreed it was not normal, so she's headed back to Petaluma to get checked out.

ochrisl
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Re: TC-50 humming

Post by ochrisl » Mon May 07, 2018 8:57 pm

Amp is fixed and on it's way back!!

bandit2013
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Re: TC-50 humming

Post by bandit2013 » Tue May 08, 2018 6:20 am

I am curious to find out what was the cause of the issue. Did Mesa indicate what the problem was?

ochrisl
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Re: TC-50 humming

Post by ochrisl » Tue May 08, 2018 9:15 pm

Yea they did actually. "Replaced +15v regulator, putting out +16.7v, unbalanced supply caused hum when using 4558 IC in Drive or Tight setting. All else a-ok, benched, burned, played."
Only about a week from the time I got a message that the amp was received until they emailed me saying it was done,what they fixed and that it was shipping back to me. I really expected to be without it for a few months. 8)

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