01-07-2022, 12:55 PM
This model uses silicon power diodes for the voltage doubler. Did you replace them? I suggest 1N5408 diodes.
Those are ceramic caps, not mica across the diodes. They are there to suppress transients when the diodes switch on and off. Moden diodes are "tougher" than the early ones.
What line voltage do you have coming in? What cap did you use for C1 and C2? Original was 140/150mfd.
All the power for B+ goes through them so it should be a low ESR type with high ripple current rating.
DC voltage on Pin 7 of the picture tube varies with the brightness control.
Side note: Keep in mind that there is no voltage regulation so your readings may vary from what Sams published. Something else to consider is the way Sams created their service info. They would just buy a TV and reverse engineer it. The original manufactures service info will have slightly different voltage values.
For example, Philco service info has +275 for B+ and +265 going to the tuner.
Those are ceramic caps, not mica across the diodes. They are there to suppress transients when the diodes switch on and off. Moden diodes are "tougher" than the early ones.
What line voltage do you have coming in? What cap did you use for C1 and C2? Original was 140/150mfd.
All the power for B+ goes through them so it should be a low ESR type with high ripple current rating.
DC voltage on Pin 7 of the picture tube varies with the brightness control.
Side note: Keep in mind that there is no voltage regulation so your readings may vary from what Sams published. Something else to consider is the way Sams created their service info. They would just buy a TV and reverse engineer it. The original manufactures service info will have slightly different voltage values.
For example, Philco service info has +275 for B+ and +265 going to the tuner.
