First, congratulations Andy on what you're achieving!
Quote:
Originally Posted by beery
Not only is the HF end limited, but the screen shot also shows a very poor LF response, which is odd as the CRT drive is DC coupled.
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If this is like the 904, the video drive is coupled via a parallel C and R, shunted by another R at the cathode (there's also a series L further back). If the tube were soft and this meant it was presenting an appreciable load instead of a high impedance to the video feed, would this not change the effect of this drive arrangement, and cause reduced LF?
Steve