Phono 2 CF

[Phil Y]

Hello all, a question for the technically knowledgeable.

Is there any reason that the cathode follower valve in the Phono could not be changed for a ECC82 to lower its output impedance?
Obviously the resistors in the cathode circuit would need changing to bias the different valve correctly, but beyond that is there any problem?

My reason for asking is that these days, very few things adhere to (the once standard?) 47K input impedance, and the Phono 2 needs at least 40K to be correctly loaded.

What started me on this was looking at headphone amps that mostly seem to be 27K input but some even lower. I also know of one (commercial) passive pre that has 10K input impedance!

I know I could build an active Pre but my CD and TV go through a modern DAC that will drive anything and my tuner also has transistor o/p, so going to the cost and time of building an active Pre for the benefit of 1 of my 4 sources would seem silly and wasteful.

Phil.