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100ma fuse blows frequently - VOX Amplification Vox Lil' Night Train Set Amp Combo

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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

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

1 Answer

Mackie profx12 fuse keep blow


Be sure the capacitor was replaced with the correct polarity?
in the beginning of my tech career I have replaced caps back words on accident. ..

Mar 06, 2015 | Mackie ProFX12 Professional Compact Mixer

1 Answer

Hammond organ c2 hook to a 147 leslie speaker it keep blow the 1.5 slo blo fuse how do I fix this


Like all the past answers, make sure everything is clean and lubricated expecially on the Lesley if it's a motorized rotating speaker, the slow blow fuse is telling you there is a problem ?

Feb 22, 2015 | Music

2 Answers

Bm5a blows fuse when turned on


Blowing a fuse means that it has a dead short. The fuse does its job by protecting the other components while the circuit fails. Something is definitely burned out inside.

Mar 24, 2014 | Dynaudio BM5A Active Monitor

1 Answer

Repeatedly blows fuses


It's probably not your outlet, but try to get it into another one so you are sure.
It could probably be that something is wired short, so the amp draws extra amperes, therefore blows fuses.

Feb 27, 2014 | GallienKrueger Gallien Krueger 800rb

1 Answer

Trying to find the right fuse for a eden World Tour 800 bass amp


Well, hope this helps you.

Fuse Requirements:
USA @ 120 Volts /60 HZ - 10 Amps, 5 x 20 mm GMC/T/slow blow
Europe @ 240 Volts/50 Hz - 5 Amps, 5 x 20 mm GMC/T/slow blow
Japan @ 100 Volts/60 Hz - 12 Amps, 5 x 20 mm GMC/T/slow blow

Mar 10, 2013 | Hartke HyDrive HX410 4x10 Bass Cabinet...

1 Answer

Have a hartke lh1000 head . played about 5 total hours then blew the fuse. is this something i shoud be worried about?


If the fuse is correct ( check manual) it shouldn't blow under normal operation. Once in while a fuse will break internally and thus blow the fuse. look close at the blown fuse If it is a "violent" blow (totally black inside) then you have an overload condition. I would use an ohm meter to check the connection to the speakers. Usually it should be between 8 ohms and 4 ohms if the number is lower than 4 ohms your speakers or wiring are putting to much of a load on the amp. If the fuse was not a "violent" blown fuse then replace with a new fuse of the exact proper value. many amps use an MDL fuse that is a slow blow fuse and has much different in circuit function than a ACG fuse so use only the exact proper furse that the manufacture recomends. If the load (speaker and wiring) is correct and the fuse is correct and still blows then you have a component problem and the amp will need repair

Jan 19, 2012 | Hartke Lh1000 Bass Amp Head 1100 Watts...

3 Answers

I have an Ibanez TSA15H amp that keeps blowing the F6 fuse. the fuse is a 500mA, but Ibanez told me to change it to a 100mA fuse and that would solve the problem. i did this, and it still blows. also...


This appears to be a common problem with this amp. Putting a smaller fuse will only cause it to blow easier...not sure what Ibanez techs were thinking. Mine blows with 500mA fuse...usually because failing to let it warm up the 30 seconds with standby switch off. I have used .75A-250V fuse and it eliminates the problem. Note: it also defeats the purpose of the fuse and leaves the circuit unprotected....voids warranty/fire risk/ shock risk/world will end, etc. I don't recommend using higher rated fuses but it appears that portion of the circuit draws more than the 1/2 amp fuse can handle.

Jun 29, 2011 | Ibanez Tube Screamer Series TSA15H Head...

1 Answer

What fuse does the Presonus ACP88 use? and why does it blow?


Do NOT replace fuse without repairing the CAUSE of it blowing. Fuses blow as a result of excess current being drawn. They protect from further internal damage. They can blow because of an internal failure or because the inout power is outside of the specified value...ALWAYS check your power source. Always power all interconnected equippment from one receptacle or power source.

Jan 18, 2011 | PreSonus Acp88 8 Channel Compressor...

1 Answer

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.

Jan 19, 2009 | Behringer Pmp3000 16 Channel Audio Mixer

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