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RE: Out of curiosity

They seem to be a late mC1 with the D getters, all the later long plates are halo style getters although I have seen one f91 with a D getter. The mC1 or f91/92 appellation should be located right above the date codes. If it is infact the mC1 they are quite valuable as are all Mullard long plates, but I find them excessively warm as I stated elsewhere. The f91 series is a totally different animal, significantly more open and airy sounding.

The f91's can be distinguished by the unusual construction on the top mica opposite each plate structure. There is a metal staple with a little coated wire extending from the outboard staple to the cathode.


Stu

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