Hey fellas. Long story short... been into the whole NOS tube rolling lately and bought a bias meter to make matched pairs and such. Anyhow, I first tested my winged 34`s I`ve been running lately from the tubestore (bias point 35) to get a sample. Here`s what they tested at: 58,73,70,67. One of them was slightly red plating. Then tried some used sylvania 6ca7`s 68,98,80,52. Next my beloved set of matched Mesa branded 6ca7`s
65,93,88,63. WTF is going on here!!! Those numbers are WAY TOO HIGH. I popped in my winged 6l6`s from Doug and they read at 30,41,38,30. Stock green label mesa`s 35,42,48,33. So I dont believe the meter is at fault here cause the 6l6`s are in spec. I went ahead, out of curiosity, and mixed mesa 6l6 outer, winged 34 inner (one of which was the red plating el34) and heres what I got 36,20,28,35 (6l6 setting). Any idea whats happening in EL34 mode? Is this a factory fault that made its way past QC? Any help appreciated. Sure glad I didnt fry my mesa 6ca7`s........
65,93,88,63. WTF is going on here!!! Those numbers are WAY TOO HIGH. I popped in my winged 6l6`s from Doug and they read at 30,41,38,30. Stock green label mesa`s 35,42,48,33. So I dont believe the meter is at fault here cause the 6l6`s are in spec. I went ahead, out of curiosity, and mixed mesa 6l6 outer, winged 34 inner (one of which was the red plating el34) and heres what I got 36,20,28,35 (6l6 setting). Any idea whats happening in EL34 mode? Is this a factory fault that made its way past QC? Any help appreciated. Sure glad I didnt fry my mesa 6ca7`s........
I wonder if not using mesa branded el34`s has anything to do with it. BUT, the tube store =c= 34`s are supposed to be in spec with mark v. Hmmmmm
