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Hoffman Amps Forum image Author Topic: AC hum really bad  (Read 2866 times)

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Offline 67polara

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AC hum really bad
« on: January 10, 2011, 10:27:00 pm »
OK, I said I was going to build the reverb into my head cabinet of my TOS.  OK the amp is dead quiet as long as I do not put the Reverb pan in the head as soon as I do that, AC hum big time.  Is there someway to shield the transformers from the pan?  Plan B would be to mount the pan in the speaker cab but that wasn't choice A.  Any thoughts?

Tony

Offline Raybob

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Re: AC hum really bad
« Reply #1 on: January 10, 2011, 10:36:41 pm »
Be sure the "output" end of the tank is at the opposite end of the cab to the PT.

Raybob

Offline 67polara

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Re: AC hum really bad
« Reply #2 on: January 10, 2011, 10:44:10 pm »
OK I will try that now.  Yep problem solved I flipped it around and moved it all the way to the left and no noise dead quiet again 

Thank you very much.

Tony

Offline Willabe

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Re: AC hum really bad
« Reply #3 on: January 10, 2011, 11:50:28 pm »
Hee hee, I love this place!
OK I will try that now.  Yep problem solved I flipped it around and moved it all the way to the left and no noise dead quiet again 

Thank you very much.

Tony

Hee hee, I love this place !!!   

   
         Brad      :smiley:


Offline plexi50

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Re: AC hum really bad
« Reply #4 on: January 11, 2011, 03:32:38 pm »
I have seen had a few amps latley that have the red input cable wired backwards

Switched the cables around and good to go.  I wonder why they do that! :laugh:

 


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