The Science of Stereophile

It was only popcorn. Only?

John came in this morning and asked if I'd retrieve the PrimaLuna ProLogue 3 from our storage room.

"I heard from their engineer," he says. "They came up with an impedance figure that is very different from what I determined in my measurements, so I want to re-check it. I brought my measuring gear, so I can do it here."

"Cool," is all I can say.

As I type, JA is drawing a crowd. Going without the labcoat in favor of faded blue denim, he whistles while he works. Women admire him, men want to be him, audio components crave to be where the PrimaLuna is now.


He walks into my office, looking a bit disappointed.

"I'm finding nothing different. I'm getting the same results I determined previously. I hate that. I may have done something wrong, but this is a very simple measurement."

He goes on to relate the specifics, mentioning Ohm's Law and other things I only associate with high school, things I've long forgotten.

"Interesting," is all I can say. "What now?" I ask.

"I go back to my office and think."

I smile and nod.

"After awhile," he continues, "I'll come back out and check it again. A different way."


Stay tuned. The review of the PrimaLuna ProLogue Three preamplifer (along with the ProLogue Seven power amp) is scheduled to appear in the December issue of Stereophile.

Al Marcy's picture

Two engineers finding the same number is not Truth, it is coincidence. Relax, we are only Human.

John Atkinson's picture

For completeness sake, I used some portable test gear to remeasure the PrimaLuna preamp's output impedance: A Neutrik Minirator signal generator; a Fluke 87 true-RMS multimeter; and a Heathkit decade-switched precision resistance box.