Simplement, si tu n'a plus de -100V (au départ de l'alim évidement), il te faut certainement changer ce qui pilote le circuit TR4, TR2, R9 sur la power supply, c'est à dire:
MJE15031
2N5551
39k ohm, 1 or 2 watt flame proof resistor.
Test déjà ces trois composants.........
Sinon, regarde ceci:
* TR4 = MJE350 or MJE15031 transistor. The MJE350 is a PNP 300 volt transistor, and slightly more robust than the MJE15031 (but the MJE15031 is easier to find). Also a 2N5416 with a "star" heat sink will work.
* TR2 = 2N5551 (NPN 150 volt transistor).
* D8 = 1N5228 (3.9 volt 1/2 watt) or 1N4730A (3.9 volt 1 watt) diode.
* D7 = 1N4004 diode
* D10 = 1N4764 (100 volt, 1 watt) diode. Use 1N4763A (91 volt, 1 watt) diode instead (to increase score display life).
* R9 = 39k ohm, 1 or 2 watt flame proof resistor.
* R13 = 680 ohm, 1/2 watt resistor.
* R10 = 330k ohm, 1/2 watt resistor.
* C12 = 0.1 mfd 500 volt (or 250 volt will also work) metal polyester capacitor.