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Hmm -about 15 years too late for me to help much. No tube cameras or schematics around the lab anymore. All I can recall is that the HD Saticon amps involved a low-noise FET input, in a feedback amplifier that by its topology compensated automatically for the target capacitance. Having trouble reconstructing in my head how that worked.
Sony, who manufactured the Saticons as an assembly including the FET soldered directly to the faceplate, had a lock on the low noise FETs, and made BTS de-solder and return the Sony FETS and install BTS's own, presumably inferior FETs in BTS cameras.
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