The restoration of the Firestone is almost finished. Still some points to review:
a vertical linearity to better and the problem of the sound which tend to be poisoned by the image signal due to the sound frequency very close to the image frequency. 4.5mcs. The sound signal come from the video anode and pass through a filter. We have to increase the sound frequency channel up to 5 mcs to accomodate the RF modulator output.
I will change all the 5n ceramic decoupling capacitors of the if stages and have to check every resistor of those stages. Anyway the Firestone is on the way back to life !
Sorry for the poor quality of my screen shots. The crt is quite OK.
roger
