by EWBrown » Thu Aug 07, 2008 6:15 pm
The 12BZ7 has the same amplification factor (mu = 100) as a 12AX7, but the plate resistance is half, and the transconductance is double those of a 12AX7, so the cathode and plate resistors may have to be "tweeked" to get the best performance. 12BZ7s can tend to be somewhat noisy, as well, so YMMV, etc...
Just hink of each section of a 12BZ7 as being equivalent to two 12AX7 sections connected in parallel.
It won't do any harm to just try it out first, and evaluate the results.
/ed B in transition between states
Real Radios Glow in the Dark