We are looking for a buffer/attenuator to couple the output of a tube preamplifier to a solid state power section. It appears the attenuation needs to be about 6:1, and the output impedence fairly low in comparison to the 12AX7 output. A fixed gain arrangement should be sufficient, since there are many level controls in and out.
A cathode-follower is said to work, but we are not going to add any more tubes. Also, very minimal levels of noise and distortion are desirable.
This is an age-old question with several solutions; however, it has been noticed AD regularly produces new and better products, so we are hoping for a simple (few parts), low-noise solution.
The power section diagram is attached. The typical output impedance of a 12AX7 is about 75k.
Any guidance would be appreciated.