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Help! Super Twin Reverb Problem

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12/3/2005 7:08 PM

Help! Super Twin Reverb Problem

Hi! i bought an used fender super twin reverb and the guy said that i had to change the tubes, so i did, i put 6 new 6l6 on, and the sound was great for a couple of months, then it got a bit distortioned, and now it sounds awful, i wonder what could it be?? i noticed that i only changed the power tubes and not the pre-amp tubes, could that be the problem?? THANKS!!

12/3/2005 7:18 PM

quote:
"i only changed the power tubes and not the pre-amp tubes, could that be the problem?"

Possible, not likely.

Can you describe the distortion and when/how it happens?

Does playing with the tone, vibe or reverb knobs change anything much about the distortion?

Does it start distorting at a lower volume than it did??

You may find R.G.Keen's Tube amp debugging page helpful.

12/3/2005 8:26 PM
lex	it's a soft distortion but anoying, it happens everytime i'm playing normally, even more when i'm doing something low like an E chord or G. I have to play soft for not gettin it distorted. No, it's the same thing arranging the knobs, it's always distorted. The more volume that i set, the more that it distorts

12/4/2005 7:12 AM
Regis	Run the amp into another speaker cab to see whether the speakers are blown. Also, was the amp properly biased when you installed the new tubes? Does it distort at low volume levels? That is, when the volume on the amp is set at 3 or less, or only when you drive it hard? Does it do it in both channels? Eliminate the obvious, try another guitar, cords, take any pedals out of the loop, etc.

12/4/2005 8:11 AM
lex	I have run it into another speaker and it's the same thing. No it wasn't biased, i don't even know what's that, i was the one who installed them on no, it doesn't distort at low volume it has only one channel i've gotta try with another guitar... i have tried with different cables, without pedals, and that's not the problem. Thank you

12/5/2005 2:12 PM

Go here and read this:

http://www.aikenamps.com/WhatIsBiasing.htm
http://www.duncanamps.com/technical/lvbias.html
http://www.aikenamps.com/Why70percent.html
http://www.aikenamps.com/Biasing.html

In fact, go here and read all of it. You will be better for it:
http://www.aikenamps.com/TechInfo_2.htm

It seems to me you have bad tubes, but it could be other stuff as well. You need to to take it to an amp tech for diagnosis. If you have any old tubes try swapping them out and see if it makes any difference.

12/6/2005 9:10 AM
lex	ok i'll take it somewhere... thank you

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