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Post subject: HELP :( Blues Junior gives no signal, only crackles
Posted: Thu Mar 22, 2012 2:17 pm
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Hobbyist
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Joined: Thu Mar 22, 2012 2:05 pm
Posts: 3
hello community,

is there anyone who can help me with this issue:

when i switch my blues junior on, it starts humming as normal and all in a sudden starts to crackle. sometimes fast, sometimes slow, but i dont get any audio signal from my input.

i swtiched input cables, of course - not better.
the crackle's volume depends on the master position and i can also put a nice reverb on it;), but level and eq have no effect...

i can also hear the reverb spring when i shake the amp a little,
all tubes are glowing (i replaced them 2 years ago but have hardly used the amp, the look clean and good in comparison to the used tubes before...)

any hint?
thanks in advance.


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Post subject: Re: HELP :( Blues Junior gives no signal, only crackles
Posted: Thu Mar 22, 2012 2:27 pm
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Joined: Thu Mar 22, 2012 2:05 pm
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oh well,
i just realized:

there is an audio signal but veryveryvery quiet. almost not there...


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Post subject: Re: HELP :( Blues Junior gives no signal, only crackles
Posted: Thu Mar 22, 2012 7:33 pm
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Rock Star
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Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
You try swapping out the input tube (V1) with a known, good 12AX7? I hope this does the trick.


http://www.webphix.com/schematic%20heav ... ues_jr.pdf


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Post subject: Re: HELP :( Blues Junior gives no signal, only crackles
Posted: Mon Mar 26, 2012 5:19 am
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Joined: Thu Mar 22, 2012 2:05 pm
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ok. thanks for the suggestion. i'll have a look...


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Post subject: Re: HELP :( Blues Junior gives no signal, only crackles
Posted: Tue Mar 27, 2012 5:34 am
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Professional Musician
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Joined: Mon Jan 28, 2008 5:53 am
Posts: 1686
Location: Brooklyn NY
I had that same problem and my amp was under warranty. They said the board had to be changed and Fender was having a problem with that issue in the BJ. The board was changed and the crackle noise went away. Yours might need to be changed too, check it out before changing the tubes.

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