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Peavey Vyper Tube 120 keeps blowing fuse

The Amp is brand new I bought from Musicians friend and it keeps blowing it's fuse

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You are either trying to: (A) push it too hard, (B) using the wrong type of fuse -- should be a "Slo-Blo" type, or (C) it has internal shorting or voltage modulation and requires service.

Posted on Jan 14, 2013

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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: Fuse blowing on start up on Behringer PMH 518M

Try running the amp with no speaker cables connected. If it doesn't blow the fuse you know it's either your Speakon cables or the speakers themselves that are to blame (it's usually the cables)

If it still blows then there is a more serious problem with the power section.

Posted on May 28, 2009

  • 73 Answers

SOURCE: fuse keeps blowing upon replacement

The fuse blows because of a short in the Power Supply. The power transformers primary windings are probably shorted. next in the chain would be a bridge rectifier or a quad of diodes forming a bridge rectifier with a couple surge diodes off of the filter caps. so if you can disconnect the power from the amp, on the power tranny disconnect the primary wires ( the input AC power wires) usually white and black and take an OHM reading with a mulimeter accross the white and black wires. you should get a reading of 15 ohms or higher up to 30 or so. if so the primary windings are good. so then check the secondary (output windings) red and red yellow, etc. ohm reading and you should get a relatively low ohm reading 2-6 approx. if so its a good tranny. on the primary side if you get a real low reading for ohms , like 1 or something, its toast. once you rule out the tranny, switch your digital mulitmeter to read diodes (in the ohms area looks like a diode symbol (a line and a solid triangle with the line being at the tip end of the triangle). desolder one leg of the diode and put one probe on one side and the other probe on the other side. it should only ring out in one direction. you will be testing approx 6 diodes in this power grid on the pcb. you can also desolder the filter caps after you safely discharge the voltage with a 1 ohm 1 watt resistor to ground and use an analog volage meter to see the needle rise in one direction and not in the other (switching the test probes from one side to the other on the cap). usually what i do is just spend 20 bucks on all those parts from mouser.com and instead of desoldering to test i desolder to replace with new. diodes usually part number 1N4003 or 1N4004 somewhere in that ballbark. hope that helps. i think its your power tranny primary winding that is shorted, be aware that this might domino effect into the rectifier and caps, so expect to replace them. its super easy!! you can email me from my website yostamplifier.com

Posted on May 07, 2010

  • 5603 Answers

SOURCE: I don't get any sound from my peavey viper 120

Suspect switch contacts that are a part of the headphone jack.

Posted on Jan 17, 2011

  • 41 Answers

SOURCE: peavey valve king blows fuses , doesn't seem to

If the amp has done a lot of hours, the output tubes may be worn out.

Posted on Feb 28, 2011

  • 7 Answers

SOURCE: I just purchased a like-new,

Here is everything you need for the Vypr 30! (click the DOWLOAD tab)

Also, for a good demo, check out the Gearwire videos, Part 1 and Part 2.

Good luck and keep rockin'!

Posted on Mar 05, 2011

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Where is fuse on peavey kb1 located?


Not sure about the KB-1, but many newer Peavey amps
( A Vyper for example)
have the fuse soldered to the circuit board.
If you're going to go through the effort of soldering, I'd suggest buying, and soldering in, a rear panel accessible fuse holder, so you only need to do it once.

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Blowing the main fuse.on my peavey 212 renown.can someone help me out.hate to scrape the thing.


This is a vacuum tube driven amp. First thing to do is remove all the tubes and see if the fuse burns out. If it does not then a tube is bad. Process of elimination to figure out what tube it is.

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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

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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...

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Noisegate on vyper tube 120 chokes note off on high gain settings to much for my taste


You are probablly overdriving the unit. Too much gain saturates the electronics. The noisegate really only works to eliminate noise when input signal is below a certain level... it is NOT used or effective when at high signal levels. If you set gain too high the tiny signals will open the gate. The noise gate will prevent low signals like guitar "handling" noise from passing through until you are actually playing the guitar. This is the purpose of the noise gate.

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1 Answer

I bought a Vypyr 120 combo amp with the Sanpera II foot switch a few months ago. There have been at least a half a dozen episodes where I'll be playing and the amp will just freeze-up, no sound unable to...


You should NOT be blowing fuses... If you are you MAY be overdriving the amplifier. It should be hard to blow fuses in a tube amp unless the power tubes have become gassy (purple glow between the elements) or you are driving a square wave (full distortion) that may be saturating the output transformer.

This unit has a digital signal processor for the modeling and when the amp seems to freeze, it is probably this part of the system that freezes and ceases to pass the audio.

Make sure you run the amp on CLEAN power. Using a long small gauge extension cord may cause the freezes.

An even more insidious problem is static electric discharges... some so small you may not even feel it. If you are on rug, spray the area with Staticide anti-static spray. A small static discharge can send the DSP into never-never land and the amp will appear to quit. Raise the humidity to at least 40% will help the static problem.

Make sure you are using grounded outlets.

Feb 26, 2011 | Peavey VYPYRT120 Vypyr Tube 120Watt Combo...

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