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SurfGuitar101 Forums » Gear »

Permalink 6G15 RI white noise

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BamaSurf
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Joined: Oct 18, 2017
Posts: 92
Mobile, Alabama
Link Posted on Jan 13 2018 06:48 PM

Bought a used 6G15 Fender Reverb RI a month ago or so. It has now developed an issue with white noise when using the Mixer knob. It started out when setting the mixer control to 6 or more now it starts at the 2 setting. Have any ideas what might cause this?

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JakeDobner
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Joined: Feb 26, 2006
Posts: 12159
Seattle
5 News Pins 5 POTD Pins 1 Map Pin
Link Posted on Jan 13 2018 06:58 PM

When rotating it? Or just whenever the mixer is dialed in above two?

If it is only when rotating, just rotate it left and right a bunch of times semi quickly to see if it lessens or goes away. If it doesn't, get a can of deoxit and spray it all over the shaft of the pot and then do the above, the white noise will be gone.

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BamaSurf
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Joined: Oct 18, 2017
Posts: 92
Mobile, Alabama
Link Posted on Jan 13 2018 08:02 PM

No it's not a scratchy pot....just white noise. It does have a 6K6 that looks really dark on one side. I just found my stash of tubes and I have a couple of new 6V6GT out of a DRRI I swapped out few years back. I'll put one in the reverb unit tomorrow and see if that solves the problem. Probably just swap all the tubes.

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Gilette
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Joined: May 04, 2014
Posts: 734
Montserrat
3 Download Pins 22 Security Pins
Link Posted on Jan 14 2018 02:29 AM

I've had these symptoms in an amp once. It was caused by a tube socket which was partially carbonized by arcing. I had to cange the phenolic sockets to ceramic ones.
Or you just replicated the way background radiation was discovered.

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BamaSurf
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Joined: Oct 18, 2017
Posts: 92
Mobile, Alabama
Link Posted on Jan 14 2018 12:25 PM

Replaced the tubes.. Put in a 6V6 and found the 7025 had been replaced with a 12AX7, so I installed a 7025...still white noise. Unplugged the foot switch...no more white noise. Put the 6K6 back in ...no white noise. Plugged the f/s back in...white noise...unplugged the f/s no white noise.
Reckon the foot switch or the f/s plug in is the culprit.

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Chippertheripper
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Joined: Mar 11, 2011
Posts: 819
Semass
1 Security Pin
Link Posted on Jan 15 2018 07:58 AM

It could very well be that the wire is acting as some fun kind of antenna.

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