This introduces a problem when mixing data (either combining or just comparing) calibrated before and after this change. By default Miriad tasks use the new flux scale. However if you use the option `oldflux' in gpcal and mfcal when calibrating 1934-638, the old flux scale will be propagated to the calibrated data. In this way, new data can be calibrated to have the old flux scale, and so can be combined/compared directly with data calibrated before the revision.