Wodgy wrote:Has anyone done any measurements of the Eiclone (frequency response, THD+N, distortion vs. power output, etc.)? I realize that any measurements are going to depend on what bias the builder chooses, etc., but I'd still be interested in seeing rough measurements before diving in. Thanks!
Hi Wodgy,
I have all this data and then some. I've just been too lazy to post it. :sleeping:
But while testing out a linestage this morning, I realized that I need to change my audio analyzer software control to 'cal out' the THD+N from the source. The listed specs are .05%THD+N for the HP 8903B, but I just measured it (against itself with a jumper) and I was getting .19%THD+N with a 100mVrms output. Dang! This is good though, because before I realized this problem I had only been able to tweak my linestage (see the post in Tube 101) down to .25%THD+N across the band. While I was bummed out, now I know I'm actually under .1%THD+N. Mind you, I'm not a spec junkie, but an audio analyzer helps me zero in on the most linear tube operation.
Let me fix my code and I'll re-sweep an Ike.
Shannon