112A DHT Schrodinger's Preamp

I like that period of time where you have just worked on a piece of gear. You don’t know if what you have done works or not. It is in a perfect state of working or not working until you measure it. I like to savor this time and wait till the next day.

This is where we are at now. If my measurement rig can be trusted. We are going to double-check with another piece of gear soon.

Some measurements:

5.085 DC Filaments

91v B+ Plate 

93 B+ No AC clean AF

5.85v measured between led and ground

8mv AC on plate

Gain all the way up. 1k

Gain all the way up. 10k