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I would expect the HO tube bias measured with respect to ground to rise by 5 or 6 volts when the cathode is grounded by virtue that the bias is derived by grid rectification. Hence the total bias is dependent upon the drive amplitude.
My thought is the added reactance to the cathode circuit (5ufd cap and wiring) may hinder the ability for th HO tube to be turned off at the end of forward scan. This would reduce the pulse height and inrease the effective series impedance of the HV supply. This is only my thought and I'd next like to explore.
Last edited by Penthode; 01-26-2013 at 02:29 PM.
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