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Post subject: Blues junior IV hum
Posted: Wed Jan 08, 2020 12:26 am
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Hobbyist
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Joined: Tue Jan 07, 2020 11:34 pm
Posts: 1
Well I bet this has been covered but I can’t find the variable that applies to my situation.
So my amp that is only 8-9 months old and has in the last couple of days developed a hum that cannot be reduced by doing anything.

I mean if I unplug any guitar, turn all knobs to zero the hum remains. And jts relatively loud. Is this covered by warranty?

Based on posts I have read it is likely to be a valve. I have no experience messing with valves so any advise To diagnos this would be helpful.

Thankyou in advance
Sarge


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Post subject: Re: Blues junior IV hum
Posted: Sun Jan 12, 2020 2:49 am
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Joined: Fri Feb 05, 2010 4:31 am
Posts: 14045
Location: Province de Québec, Canada
Nothing plug to the amp with all knob to zero :

Output Power tube issue
Filter caps issues
Printed circuit issues

IMO it is warranty, nothing about that with paper you receive with the amp ? Google :lol:

https://support.fender.com/hc/en-us/art ... y-product-


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Post subject: Re: Blues junior IV hum
Posted: Thu Jan 16, 2020 6:52 am
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Professional Musician
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Joined: Tue Nov 27, 2012 6:56 am
Posts: 1677
Location: Coastal Bend, Tx.
If you are leaving the guitar cable plugged into the amplifier w/o a guitar and it hums, try a different cable. TRS guitar cables generally act as antenna when only connected at one end. TRS connections fray when twisted and it doesnt take much to destroy the braided ground shield.
Otherwise, as Stratele stated w/o a cable plugged in, I would add a faulty input or ground issue as possible problems and agree it should be covered under warranty unless it is faulty tubes- so contact Fender and send it to closest authorized repair facility.


Last edited by sfceric64 on Thu Jan 16, 2020 6:56 am, edited 1 time in total.

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Post subject: Re: Blues junior IV hum
Posted: Thu Jan 16, 2020 6:55 am
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Joined: Fri Feb 05, 2010 4:31 am
Posts: 14045
Location: Province de Québec, Canada
No news since one week. OP may have find how fix the issue


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