Its a 7N07. Look up in the 'electrostatic speaker from zenith x334' thread above. can only post pics once in AK.
FWIW I powered it up today and IT WORKS!!! Tunes stations across the band(AM so far) volum and tone work and are nonscratchy, but I cleaned them. Speaker is abit scratchy being an old paper cone. Hope to find a new one. Hope antiqueradios has one.
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