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AUDIO VALVES: MH41, 41MH, HLA1, AC2/HL, 904V, 4DXAC, TRIODE

The  MKT4/5 was a beam tetrode version of the earlier (1932) MPT4 output pentode and was intended as a plug-in replacementfor the discontinued MPT4.   . The beam tetrode version had the advantage of a lower distortion allayed to a higher output .  There is a B7 based variant having an identical electrode cage but of course a differing valve base - tant pis!

In single ended audio configuration could provide an output of 2.5 Watts.

MH41 
MH41 
MH41