Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: 67polara on January 10, 2011, 10:27:00 pm

Title: AC hum really bad
Post by: 67polara 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

Title: Re: AC hum really bad
Post by: Raybob 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

Title: Re: AC hum really bad
Post by: 67polara 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

Title: Re: AC hum really bad
Post by: Willabe on January 10, 2011, 11:50:28 pm

Hee hee, I love this place!

Quote from: 67polara 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

Hee hee, I love this place !!!   

   
         Brad      :smiley:

Title: Re: AC hum really bad
Post by: plexi50 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: