The four-pin SR-18-2 was intended to replace the HV mercury vapor tube in certain transmitter circuits (I believe the 8008/8008AX type). Four of those solid state stacks are here plus 2 bonus lower-voltage stacks (smaller in stature - I can't tell what model or circuit they are from a glance - maybe you with sharp eyes will spot a deal). About 3 lbs. of material.

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