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Post subject: 59 Bassman Tubes
Posted: Tue Nov 09, 2010 12:18 pm
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Hi just wondering if anyone knows what the number is on the standard 6L6 stock power tubes are? I do not see the number on the tubes. I just do not want to replace them with a tube that has to much head room. :)


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Posted: Tue Nov 09, 2010 1:27 pm
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Are you talking about the 1-10 numbers like Groove Tubes uses to rate their power tubes by when distortion occurs??? 1 being early distortion and 10 being ultra clean?

Well, Fender has their power tubes color coded instead:
The Fender tube scale is
Blue = GT 1-3 range
White = GT 4-7 range
Red = GT 8-10 range

from http://www.guitaramplifierblueprinting.com/Rating.html
also http://www.groovetubes.com/gtratingsystem.html

Since you don't want too much headroom, don't get red Fender 6L6's or GT's in the 8-10 range. Then check your bias if you are changing color. I don't know what color 6L6's the Bassman reissue ships with these days.

Supposedly you can just pop in new Fender power tubes of the same color or withing the corresponding GT range without biasing. But it wouldn't hurt to check the bias anyway especially if you're going to try a different brand of tube.

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Posted: Tue Nov 09, 2010 1:43 pm
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Thanks for the Info.

I will check it out I was hoping to not change the range as I like it the way it is. I had changed my Super Reverb tubes to JJ's and had to re bias.

I never thought to look at the color I must have had a brain cramp

Thanks again


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