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Discussion Forum for Mesa Boogie Products
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PostPosted: Fri Feb 27, 2015 10:25 pm 
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Mark II

Joined: Tue Jun 12, 2007 1:35 am
Posts: 135
OK, so my Deuce (bought used) performed great for over a year and suddenly started a serious feedback howl when taken off standby. I thought maybe just a bad tube. I open it up for the first time since I bought it and found this on V1. Any ideas what is going on here. The (copper?) foil is soldered to a resistor on the board and connected with putty to the back of the V1 tube socket.

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PostPosted: Sat Feb 28, 2015 8:52 pm 
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Mark II

Joined: Fri Jun 11, 2010 10:46 am
Posts: 91
I own a stiletto ace head that has the same thing. Its not a mod for sound but it fixed a factory defect on the circuit board that caused both channel masters to work together instead of separately. Apparently there are more than one with this problem.


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PostPosted: Sat Mar 21, 2015 5:28 pm 
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Mark II

Joined: Tue Jun 12, 2007 1:35 am
Posts: 135
I eventually found out from Boogie it's just to shield a sensitive part of the circuit.


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PostPosted: Thu Nov 05, 2015 8:52 pm 
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Dual Recto

Joined: Fri Feb 22, 2013 7:31 am
Posts: 2132
Location: North Carolina
I have seen something quite similar in both Mark V and Mark IV amps. Usually over a few film type capacitors.

Sometimes noise issues are fixed with goofy add-on's like this.

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Current amps:
TC-50, JP-2C, MK V, Roadster, RA100
Old friends I sometimes miss:
Mk III (blue stripe), Mark IVb-WB


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