Peavey 6505+ 112 Combo Amp Combo Logo

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Nigel harris Posted on Dec 27, 2013
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Peavey 6505 plus buzz...even when all controls on zero and no guitar plugged in

The amp has a constant buzz when I turn it on. It is still playable but irritating. Even when everything is turned down, no guitar plugged in it still has a constant buzz.

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Glen

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  • Expert 225 Answers
  • Posted on Jan 08, 2014
Glen
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Sounds like a bad power supply filter cap...the buzz you're hearing is the 60 cycles hum that filter caps reduce or (hopefully) eliminate altogether. It may also be related to the tubes but finding the bad one will require some work. Any friends have this same amp? If so, try swapping one tube at a time and see if you get lucky. If this amp is new take it back ASAP as it is a manufacturing defect.

5 Related Answers

Fred Yearian

  • 5603 Answers
  • Posted on Sep 22, 2009

SOURCE: Peavey 115 Low hum Low volume from input

The preamp section has a problem. It could be anything in the preamp but is OFTEN the input jack itself. They take a lot of abuse.

Also the insert jack contacts that forward the preamp to the power amp if no external FX are used can go bad.

Additional things are circuit board cracks caused by rough handling and also controls that have had the knobs mashed in which can destroy the potentiometers they are connected to.

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Michial Gueffroy

  • 1140 Answers
  • Posted on Jun 23, 2010

SOURCE: volume control of peavey bass guitars

Sorry but your post did not provide enough info. Are you having a problem with the volume control. Do you need a wiring diagram. What model Peavey bass do you have. For instance, the Peavey bass I have has active electronics ans requires a 9 volt transistor radio battery to power them.

Fred Yearian

  • 5603 Answers
  • Posted on Jul 25, 2010

SOURCE: Peavey Rage 158 guitar amp

I don't believe there is a power "outlet" on this, only an "inlet".

Usually the inlet will have a lead, often green, that goes to the chassis.

There will usually be two other wires, often black and white that connect to the other two pins.

From the back of the connector, with the center pin tied to the grenn wire of the triangle lower, the pin to the right should be the white and the pin to the left is the black wire

Michial Gueffroy

  • 1140 Answers
  • Posted on Oct 22, 2010

SOURCE: where can I get a wiring diagram for a Peavey 6505

Here is a link to Peavey Customer and Technical Support:http://www.peavey.com/support/contactinfo/ You can phone or email them. They also have a forum here:http://forums.peavey.com/viewforum.php?f=26&sid=f9cc8b0bfb603e47a6b02ce8a66328b4 Here is another good link to have:http://www.peavey.com/support/spkrcomponents/

Anonymous

  • 1 Answer
  • Posted on Jan 15, 2012

SOURCE: my peavey vypyr 75w won't turn on

my vypyr 75 JUST did what you were talking about. From what I'm researching this has happened before and it's the fuze which is soldered to the circuit board. I'm taking it to the store I bought it from so they can fix it. I see you posted your problem a long time ago but I hope this helps someone new that it happens to.

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Brand new Peavey 6505. Worked fine first day but now just blows fuse and doesn't even turn on. Will be going back but has anyone got any ideas?

Something internally has shorted...not a good indicator of this models reliability. It may pay to research another replacement brand.
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I need a schematic

Check with the dealership for the nearest service center.
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Can the Peavey 6505+ channels be switched using midi in some way?

The short answer is NO... One COULD build a special MIDI interface to replace the footswitch inputs that was controlled by MIDI signals... would NOT be that hard, but would be special. One company makes a MIDI interface that is small. Use this and connect some relays to drive the foot switch inouts and it can be done.
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6505 +112 has a bad hiss with nothing plugd in

Some hiss at high gain settings is normal. If you get objectionable hiss at 1 o'clock settings of gain, that is too high. Electronics has noise that is "statistical" in nature due to physics that we can't get around in design. Most hiss is created in the preamp area and swapping tubes in the first stage might help. By varying the volume controls and observing the level of the hiss, we may be able to analyze the offending staage of amplification. ALso turning up the treble controls will increase the hiss, as it is mostly in the higher pitches.
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I have a Schecter C1+, older model. When played through a clean channel on my amp, Peavey 6505+, there is a constant buzz. Tried different guitars with the same amp/cab, an the buzz is gone. Culprit is...

This may be strictly magnetic pickup from nearby sources of transformers, ballasts or other motors that generate these magnetic fields. Humbucker pickups have hum cancelling windings that PARTIALLY remove the hum. Wires from pickups to other components should be twisted to help cancel the problem.
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My amp and cable are working... but my guitar wont make sound... when i turn up the amp it makes white noise... HELP!!!

PLUG YOUR LEAD INTO AMP TURN UP JUST A LITTLE SEE IF IT BUZZES WHEN YOU TOUCH THE END OF YOUR CABLE.IF IT BUZZES THEN THE FAULT IS IN YOUR GUITAR MOST LIKELY THE ACTIVE WIRE HAS COME OFF THE INTERNAL GUITAR PLUG.
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