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Note - Even when the 7704A came out, the rack mount version is still the R7704.
Option 01 = w/o CRT Readout
Option 02 = X-Y Horizontal Compensation. A compensation circuit may be added to equalize the signal delay between the vertical and horizontal amplifiers. When included, the phase shift between vertical and horizontal channels is adjustable to less than 2 from DC to 2 MHz.
Option 03 = Emc Modification
Option 05 = Line Frequency Change (50-440 Hz)
Option 78 = P11 Phosphor