Sony KVM1430A low contrast

[bigboss80]

I redid the measurements again more accurately, with an analog multimeter with a connector mounted on the tube board, at the input of the H1 and H2 connector of the board it gives me 5.4 Volts and on the tube pins 4.3 Volts. With a digital multimeter 4.2 Volts on the connector and 3.86 Volts on the tube pins, instead measuring directly on the main board at the output by disconnecting the connector, therefore without the filament powered it gives me with an analog one by putting the positive lead on H1 and negative on H2 it gives me 5 volts, inverting the leads 5.6 Volts, instead with the digital one it gives me 4.5 volts and 4.34 volts.