Playing around today with the 4P1L chap found a very good operating point where distortion is minimised at maximum anode power disipation:
- Va=250V
- Vg = -21V
- Pa=9W (7.5W anode + 1.5W screen)
- Ia=35mA
- THD measured at Vo=+22.22dBu (10Vrms)
Interesting to see this valve swinging beautifully at just 0.027% THD….
