Mark 3c+ weird buzz and more...

Pre Recto days. Boogie modified Fenders, Mark I-IV, Dual Calibers, etc

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dwman3
Bottle Rocket
Posts: 13
Joined: Mon Dec 14, 2015 8:19 pm

Mark 3c+ weird buzz and more...

Post by dwman3 » Mon Jul 30, 2018 9:11 pm

So I’ve been jamming on my Mark 3c+ lately and there is a weird buzz that won’t go away. I don’t know how to describe it other than it sounds like a grounding hun/buzz. I’ve tried the ground switch on the back and didn’t notice a difference, tried different plugs on the house and multiple houses so I’m pretty sure it’s not “dirty electricity”. Then the amp just seems to have no “tone” I don’t know what it is also when I’m on the lead channel it just seems that there is a lot more noise then there should be, the lead gain is only on 6,7 maybe 8 and the low end on the lead channel just sounds like a grumbly mess. So I’m thinking of switching some preamp tunes in to see what happens, but can any get what I’m describing or anything I can look into?

Agustín Collia
Mark II
Posts: 128
Joined: Sat Oct 12, 2013 1:36 am

Re: Mark 3c+ weird buzz and more...

Post by Agustín Collia » Mon Jul 30, 2018 10:43 pm

When was it last serviced? It sounds like it may need new filter caps.

Wizard of Ozz
Bottle Rocket
Posts: 20
Joined: Mon Feb 21, 2011 7:43 pm

Re: Mark 3c+ weird buzz and more...

Post by Wizard of Ozz » Mon Jul 30, 2018 11:31 pm

Unplug the reverb cables and see if it goes away. Also spray some Deoxit on an instrument cable plug and insert/remove it several times from both the fx loop send & return jacks.

dwman3
Bottle Rocket
Posts: 13
Joined: Mon Dec 14, 2015 8:19 pm

Re: Mark 3c+ weird buzz and more...

Post by dwman3 » Mon Jul 30, 2018 11:58 pm

Boogie serviced it last summer so not too long ago, and it was recapped.

woodbutcher65
Mark II
Posts: 146
Joined: Fri May 04, 2018 10:36 pm

Re: Mark 3c+ weird buzz and more...

Post by woodbutcher65 » Tue Jul 31, 2018 7:59 am

If a power tube shorts, that can cause a hum or buzz. That tube will run very hot and the plate will glow dull red or even bright orange. You should smell the hot smell, too. So check on that.

dwman3
Bottle Rocket
Posts: 13
Joined: Mon Dec 14, 2015 8:19 pm

Re: Mark 3c+ weird buzz and more...

Post by dwman3 » Tue Jul 31, 2018 10:37 am

I’ll look into that,btw I appreciate everyone’s input.

dwman3
Bottle Rocket
Posts: 13
Joined: Mon Dec 14, 2015 8:19 pm

Re: Mark 3c+ weird buzz and more...

Post by dwman3 » Wed Aug 01, 2018 6:07 pm

So I swapped the v1 preamp tube and the reverb tube and the buzz is gone and it sounds and feels better like some of the tone and life of the amp is back. I still want to try some different preamp tubes Tung Sol Mullard etc... what other preamp tubes are y’all running if other then the stock Boogie tubes.

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