noromance, yes to both. My question was (is) what is the difference in bias voltage between the EL34 and the 6L6? I found some tube specs through Google and they look close in an AB final with the 6L6 about 90% of the EL34. The problem is, I'm not sure. I would hate to break the connection, but I can always fall back on inserting a milliammeter in series with the cathode and set the grid bias by the current recommended in the 6L6 tube spec. Or... pick a bias voltage below the point where the anodes (plates) start to turn red! Probably not the best idea but it actually could work(!).
sfall, I agree with you conceptually and, as mentioned, I bi-amped my system for some time but for bass control, not for more power. I could use the digital mode with four amps since the difference in sound from pure analog is virtually undetectable. However, I listen to mostly classical music and the complex harmonics from large orchestral music are detectable (barely, but subtly noticeable, nevertheless) when processed through the DSP. As said, I have subsequently maintained control through a graphic equalizer in lieu of bi-amplification.
That's why, getting back to my original OP question, I want to improve and possibly substitute my tube amp and get back to the basics of music enjoyment. Thanks for everyone's reply! Andy8400.
