Here is the 50 watt Metro-Plex MK II head (serial #001) compared to the 100 watt head (serial #018) using our Head Master amp switcher.
Settings are the same on each amp:
12301 gain: 10
12380 normal gain: 5
12380 bright gain: 5
treble: 10
middle: 10
bass: 10
presence: 9.5
12301 master volume: 3.5
12380 master volume: 3.5
Shot with my iPhone 13. Speakers are Creamback H75's.