Quantity   Component name
1 × Raspberry Pi Pico µC
1 × Z1A tube Counting tube
1 × MPSA44 Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs
1 × BC337 BJT; similar type possible
1 × Resistor 240 Ohm BJT base resistor
1 × Resistor 100 kOhm
1 × Resistor 10 kOhm Suggestion for the "output path" (without a LED)
1 × 1N4007 Diode; breakdown voltage: 1000V
1 × Capacitor 4,7 nF (2000V) Some experimentation necessary, but a wide range can basically be used
1 × Inductor 4.7 - 33 mH Some experimentation necessary, but a wide range can basically be used
1 × LED 5mm e.g. yellow
1 × Connectors, wiring etc.
1 × SBM-20 tube Counting tube
1 × Resistor 4,7 MOhm Tube resistor
1 × LCD 16x2