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In Reply to: 6BL7GT and 6BX7GT as drivers posted by gman on March 10, 2003 at 09:39:44:
I have high regard for the 6BX7GT as a driver tube for P-P DHTs. I have liked the 6BL7GT much less. I use the tube driving the outputs through LL1671/PP tranformers. I think that they have a somewhat gutsier sound than 7119/5687/6900 (if that means anything to anyone but me).
Kevin Carter
K&K Audio
www.kandkaudio.com
Follow Ups:
can you use a LL1635/5ma?
So long as you take care to make sure that the bias current imbalance is less than 5mA. I have not had much luck finding many 6BX7GTs that have sections matched to 10%, so it is better to use two tube sockets for P-P and select the matches between tubes.
Kevin Carter
K&K Audio
www.kandkaudio.com
Hooking them up as common cathode, across 25k loads, I get plate voltages within a few volts of each other. That's a fraction of a mA difference out of 8 to 10 per section.
regards,
Douglas
maybe you did something bad in a previous life?
(kidding of course)
"maybe you did something bad in a previous life?"I suspect that I did, perhaps in several past lives. (not kidding, well really I don't know)
I am typically using the tube at more like 25-30mA per section, so perhaps that is my problem.
Kevin Carter
K&K Audio
www.kandkaudio.com
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