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RE:I checked the tube characteristics of the 6550A...




The schematic says 75mA current, 38V bias, 318V on the plate (you have to take the bias voltage away from the voltage shown), so you can put a dot on the 6550 triode curves here.

The output transformer used is 2.6K, which will allow you to draw the loadline.

I've done a quick sketch of your loadline, if you swing along that load line, things get pretty ugly as you pass the -50V line, and beyond salvation at -70. This is 32V above your quiescent operating point, which isn't more than the bias voltage, so trying to swing below 0V on the grid doesn't look to be all that useful.



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