diff --git a/firmware/src/loop_cathode.rs b/firmware/src/loop_cathode.rs
index 1e7f61e..9e56221 100644
--- a/firmware/src/loop_cathode.rs
+++ b/firmware/src/loop_cathode.rs
@@ -8,7 +8,7 @@ const FBI_PID_PARAMETERS: pid::Parameters = pid::Parameters {
     ki: 20.0,
     kd: 10.0,
     output_min: 0.5,
-    output_max: 3.1,
+    output_max: 10.0,
     integral_min: -0.1,
     integral_max: 0.1
 };
@@ -98,7 +98,7 @@ impl Controller {
 
         let fv = fv_sample as f32/board::FV_ADC_GAIN;
         let fv_pwm_duty = self.fv_pid.update(fv);
-        board::set_fv_pwm(fv_pwm_duty as u16);
+        board::set_fv_pwm(120);
 
         self.last_fv = Some(fv);
         self.last_fbv = Some(fbv_sample as f32/board::FBV_ADC_GAIN);
diff --git a/hardware/errata.md b/hardware/errata.md
index 493fdff..be5e52d 100644
--- a/hardware/errata.md
+++ b/hardware/errata.md
@@ -30,10 +30,9 @@ Rev 1
 * review values of R226 and R113
 * C100 -> 47pF NP0 AVX, R107 -> 100K, C101 -> 0.1uF
 * use crystal type recommended by the MCU datasheet
-* 22k FBI current resistor -> 10k?
 * add connector for OLED display?
 * enlarge holes to fit M3 screws comfortably
-* add 15M (TBC) resistor between A and FIL-
+* add 15M resistor between A and FIL-
 * power U200 from a small negative voltage instead of GND
 * review choice of filament flyback output diode
 * invert LED position so that the Ethernet LED is closest to the connector
@@ -42,3 +41,6 @@ Rev 1
 * change D351 model to MBR1645
 * add snubber on D351
 * add heatsink (Seifert-KK633) to D351
+* move D351 further away from transformer for heatsink clearance
+* add plated-through holes and pads for mounting rods of BNC connector
+* simplify FBI circuit, 2 ranges only (typ. 8mA and 45mA), remove diodes and neglect MOSFET leakage