04-06-2013, 03:59 PM
I solved the problem with the peaks. Silly me.
The S51 Y-amplifier has two coils (inductors) in series with the anode resistors, in the diferential amplifier. I connected the deflecting plates between the resistor and the coil (erroneously), and there were the peaks. Now I have corrected that, connecting the plates to the anodes of the diferential amplifier and the square signal looks great.
Yesterday I also finnally supressed the flyback trace by adding an RC network plus a diode, in the grid of the CRT, taking the blanking signal from the screen of the 6BW7 in the time base. It worked fine. I will show oscillograms soon. I'm also drawing all the schematic in an old software (MS-DOS based), to make some kind of manual when finished.
Now I will begin to adjust ranges.
The S51 Y-amplifier has two coils (inductors) in series with the anode resistors, in the diferential amplifier. I connected the deflecting plates between the resistor and the coil (erroneously), and there were the peaks. Now I have corrected that, connecting the plates to the anodes of the diferential amplifier and the square signal looks great.
Yesterday I also finnally supressed the flyback trace by adding an RC network plus a diode, in the grid of the CRT, taking the blanking signal from the screen of the 6BW7 in the time base. It worked fine. I will show oscillograms soon. I'm also drawing all the schematic in an old software (MS-DOS based), to make some kind of manual when finished.
Now I will begin to adjust ranges.
