I have a recently acquired NuArc which appears to work fine but presents problems with consistency of printing times. I have searched the archives for answers, but came up empty.
I have run a series of tests with Pd and VDB utilizing calibrated step wedges.
When testing 100 units produced a density of 2.17. Later,probably about 30 minutes I printed a negative with significant HL density of 2.01. I printed it at 90 units and it was at least a stop too light. The next print was for 125 units and still a little light in density.
100 units take approximately 10 minutes. I read in an old post that Sandy King's unit produced 500 units in 10 minutes,(This was when he was using a NuArc) .
The bulb is essentially new. Input voltage ranges from 115-118 V on a dedicated line.
Have others had this problem with consistency?
Might it help if I open it up and adjust the integrator?
Will it be more consistent if I can significantly reduce the printing times?

Thanks for your input.

Jim