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Questions about tubes and gear that glows. FAQ

RE: Thank You

My comment was based both on advertised curves and measurements I've made. Of course, many things can mask this difference, including NFB. I use the 6BL7/6BX7 in a totem-pole configuration for the pre-driver in my 211 SETs. Back when I was sorting out the design, the 6SN7 provided better native distortion numbers. However, it wasn't up to the task otherwise (voltage and power dissipation). I eventually installed about 6-8 dB of NFB to improve damping factor, and with that, the difference between the two tubes virtually disappeared. At any rate, you claimed lower distortion, so it was reasonable to ask whether you made measurements.


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