[Milsurplus] R-390A L-601 swing choke question

[Jim Whartenby]

Has anyone measured B+ current and voltage in the R-390A/URR as the function switch is set to various positions?  I'm curious as to what trade offs were made in the power supply during the cost reduction program.  The differences between the two power supplies are substantial but the specifications with respect to line voltage specifications are quite similar, if not exactly the same.
The R-390/URR regulated power supply holds B+ variation to less then one volt for a line voltage variation of some 15%.  The R-390A/URR seems to have a much greater variation in B+ for the same line voltage variation but it still meets the same spec.  The papers on the reflector that look into the power supply seem to ignore the ESR in the inductors used in the R-390A/URR.  
Does anyone have any data to share?Regards,Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy
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