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Recent operation of LOFAR by Hassall et al has produced severe constraints onthe size and altitude of the 40 MHZ emission region in this pulsar. It is shownthat these limits, given a limited number of unexceptionable assumptions,demonstrate that an electron-positron plasma cannot be the source of theemission. A physically-acceptable plasma source composed of protons and ionsarises naturally in pulsars having positive corotational polar-cap chargedensity. Acceptance of this would greatly clarify the classification of pulsartypes within the whole.

PSR B1133+16: radio emission height and plasma composition