Question about Peavey 6505 120w All Tube Head Guitar Amplifier

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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?

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

Posted on Jan 08, 2014

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Posted on Jan 02, 2017

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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/

Posted on Oct 22, 2010

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2 Answers

Amp keeps blowing fuses


Blowing fuses, was caused by many thing.
Short of rectifier,resistor,elco,tube heater,tube pin, and also trafo itself (primary or secondary winding). It must check step by step.
CAUTION :
THIS IS HIGH VOLTAGE AREA.
RISK OF ELECTRIC SHOCK THAT CAN KILL.
DON'T DO THIS IF YOU ARE NOT TECHNICIAN OR NOT FAMILIAR WITH VACUM TUBE CIRCUIT. THE CIRCUIT MAY STILL CONTAINS ELECTRIC SHOCK EVEN IF IF THE AMP IS NOT POWER PLUGGED.


The simple steps (see picture) are:
  1. Disconnect all connection from secondary of power trafo (PLV,PDCH,PACH and PHV).
    Power ON the amp. If fuse is not blowing,trafo is good.
  2. Power OFF the amp. Unplug the cord.
    Connect PLV1-PLV2-PLV3 (this are Bias voltage,+/-15VDC and Backlight PCB voltage) to power trafo.Power ON the amp. If fuse is not blowing,PLV circuit is good.If fuse blowing,there are parts is damage (dioda,elco,7815/7915,resistor) in this PLV circuit.
  3. If step 2 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV circuit stay connected,connect PDCH 1-2 and PACH 1-2 to power trafo. Power ON the amp.
    If fuse is not blowing,PDCH and PACH circuit is good and all tubes heater/filaments are lights after a few seconds.
    If fuse blowing,there are parts is damage (dioda,elco,tube heater pins) in this PDCH/PACH circuit.
  4. If step 3 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV,PDCH,PACH circuit stay connected,connect PHV 1-2 to power trafo.
    Power ON the amp. CAUTION: HIGH VOLTAGE AREA is ON.
    If fuse is not blowing,PHV circuit is good.
    If fuse blowing,there are parts is damage (dioda,elco,tube pins) in this PHV circuit.
.amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-0.jpg
Notes:
  • Steps had to be done sequentially from 1 to 4, not upside down.
  • If tube/heater pin is short,it can't be repair. The tube must be replacing.
  • PDCH circuit is voltage for V1-2-3-4 heater/filaments.
  • PACH circuit is voltage for V5-6-7 heater/filaments.
  • Always replace fuse with same type.

amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-1.jpg

Oct 02, 2015 | Peavey 6505 Plus 120W Guitar Amp Head

1 Answer

Peavey xr1200 blows 8A fuse after about one second. Old mixer, seldom moved, has worked fine for years


If it blows a fuse when powered on, it has a dead short somewhere. Old units do this when the capacitors (filters) get old and dry out. These create dead short circuits. I recommend going through the unit and change out the bad ones. They can usually be spotted easily. They look like little cans glued on the board with an "X" on top. They are usually blue, gray, or black. The X on top is a weak spot allowing the top to open or pop up when they go bad.

Mar 22, 2014 | Music

2 Answers

Peavey tnt 115 blowing fuses


Very unlikely, sounds like it's faulty. Was this on plugging in or were you using the amp, and if so doing what? What is your supply oltage?

Jan 09, 2014 | Peavey Electronics Peavey Tour Tnt 115...

1 Answer

Peavey 6505 plus buzz...even when all controls on zero and no guitar plugged in


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.

Dec 27, 2013 | Peavey 6505+ 112 Combo Amp Combo

1 Answer

How do you connect a peavey 6505+ amp to a marshall 1960a cabinet?


On the back of your 6505 there are two jacks that are labeled speaker outputs. For mono function, use either one of those outputs and run a SPEAKER cable from your amp to one of the input jacks of your 1960a cabinet. I assume it is a 4X12 cabinet. Either input will work. Make sure you match the ohm selector on your 6505 (right next to the output jack, 4/8/or 16 ohms) to the ohm rating on your 1960 cabinet. It is likely labeled on the plate that houses the input jacks. You should be good to go. NOTE: Never turn your amp on unless it is hooked up to a speaker cabinet and never use instrument cable to hook your amp to your speaker cabinet. Bad for a nice tube amp like yours.
Rock on and hope it helps.

Dec 02, 2013 | Peavey Music

1 Answer

I turn on my 6505+ and after about 20 min or sometimes less it will start whistling. I've changed preamplifier tubes but no difference. This same problem happens every time I turn it on. The problem...


As you've already worked out Its more than likely a component breaking down. I'd take a good look at the circuit boards, look for a capacitor that's leaking, overheating or just the top is bulging out.

Oct 23, 2011 | Peavey 6505 Plus 120W Guitar Amp Head

1 Answer

Where can I get a wiring diagram for a Peavey 6505 4x12 Straight Cabinet?


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/

Oct 21, 2010 | Peavey 6505 Cabinet Straight Front

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