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Fender Blues Junior problems

Inactive Member

Guitar Equipment Forum · 4/27/2001 4:39 AM
I nedd help with my amp! It's always been great and I've had it for 2 years. But lately, the reverb does not work, and the amp gives off intense feedback. It's not a guitar thing, my guitars all work fine on my other amp, but I think it may be a tube problem. I dunno, when are you supposed to change the tubes! (I haven't since I've had the amp)
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Re: Fender Blues Junior problems

4/27/2001 5:04 AM

Conny Holtegaard (366) wrote:

The feedback is probably caused by worn preamp tubes. And if I remember correctly, the tube amp book by Aspen Pittman says: if you use your amp 2 hrs every day at high volumes you should change the tubes once a year.

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Re: Fender Blues Junior problems

4/27/2001 10:17 AM

Ward Moeller (4849) wrote:

conny may be right. i'm not sure about the setup of the blues junior, but tube amps often have one of the 12AX7 tubes running the reverb. so if your reverb is crapping out....could be.



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Re: Fender Blues Junior problems

4/27/2001 1:24 PM

Inactive Member wrote:

So both of you say its a tube problem. Is there anything at all else that it could be? Thanks for the help, by the way



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Re: Fender Blues Junior problems

4/27/2001 4:36 PM

Ward Moeller (4849) wrote:

give us a few days. by next week you'll have some other advice from folks here.

other than that, you'd have to bring it to a reputable service shop.

i'm no electro-tech.

i just play em, i dont fix em.

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Re: Fender Blues Junior problems

4/27/2001 5:54 PM

Paul Stelzmann (340) wrote:

Eric,

I also own a Blues Jr. I have had it for almost 4 years. Yeah that reverb box is a real POS. Sometimes it works, sometimes not. The warranty on circuitry is 5 years. I already took mine back to the dealer for cracked pots; they sent it out to get the work done. When I got it back the whole circuitboard was replaced. The other thing about this amp is that the knobs do not fit snugly into the faceplate...hence the cracked pots. Besides that it is a versatile and warm sounding little amp. I recommend you take it back to the dealer with a warranty claim. They should take care of the reverb problem. I think I will do so also before my warranty expires!

Paul




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Re: Fender Blues Junior problems

4/30/2001 2:10 PM

Ward Moeller (4849) wrote:

paul, eric,...thats why you should get a peavey.

hee-hee, :)...sorry, had to get that little dig in there.

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Re: Fender Blues Junior problems

4/28/2001 2:26 AM

Randy Hano (12149) wrote:

Check you reverb connections and make sure your tubes are placed well in the sockets. Usually your power tubes go first due to heat and your preamp tubes don't have much trouble. Do the reverb test, tap or hit your amp. If the reverb tank vibrates, your reverb is most likely working ok.

If you amp is feeding back and your guitar's volume is zero, your input tube has probaly developed microphonics which means it should be replaced. When your amp is on, check to see that your tubes are glowing a nice blueish purple color, this is good. If they are orange or red in glow, you may have a shorted tube.

If your guitar is on, you might be too close or your overdrive or distortion is set too high -Back it off. The other is if you have cheap pickups. If you have the lower end of guitars, the pickup wires create unwanted squealing because of vibration. This is why most replacement pickups are either dipped in wax or resined. And worse comes to worse, your amp took a dive and you need to take it to a shop!



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Re: Fender Blues Junior problems

4/30/2001 2:02 AM

Inactive Member wrote:

I looked at the tubes, and all of them are glowing bright orange... does this mean I should change them all? And which tubes are which?



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Re: Fender Blues Junior problems

4/30/2001 8:03 AM

Inactive Member wrote:

No, glowing tubes are normal.



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Re: Fender Blues Junior problems

4/30/2001 12:34 PM

Randy Hano (12149) wrote:

You may want the tech at the store to check it out. I've read somewhere that the Russian/Chinese tubes that Fender uses now tend to go bad (short). It also takes the bias for the power out. Like the other person that replied, you'll probaly end up with a new board inside to replace the current one. After you get it back, you may want to replace the output tubes with some NOS (New Old Stock) tubes or even Groove Tubes. They cost more but may save this problem from happening again. Unfortunatly you can't just go to the store for NOS tubes. Look throught web for 6V6 NOS and some sources may pop up. Or search for Kendrick Amplifiers. They sell NOS tubes.

Good Luck,
Randy

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