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6HS5 I believe is not a shunt regulator, it's a "pulse" regulator that acts on the primary circuit of the the flyback and not the HV directly...however I think Zenith may call it a shunt regulator though even though its really not.
I have a GE TV which has a 12-pin base shunt regulator on the HV, it's like a 6BK4 with different base. can't remember type though.
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