JJ tubes? Anyone tried this tube trick? (*harp-GEAR-related*)

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Anyone had any experience with the JJ tubes, sold by Eurotubes? According 
to the Eurotubes site, he is using JJ 6V6's as a drop in to tame down 6L6 
amps, they have good tone, and they live even with plate voltages as high 
as 480vdc. 

Here is something new to me:  they have a preamp tube available that is 
half a 12AX7/ half 12AU7 that would work in the phase inverter position to 
offset the waveform (same thing Gerald Weber does with his "waveform 
symmetry" knob except non-adjustable). This would work in some but not all 
circuits. I incorporated this control when I built my amp, and if anyone 
is wondering about it, it works. This tube sounds like a cheap and easy 
way to help out an amp that is just too clean. 

kcmojo