> On Apr 8, 2016, at 11:59, Seth Morabito <li...@loomcom.com> wrote: > One more observation: Two of the three +5V regulators cut out > when their input voltage exceeds about 11.5V. The input voltage > comes from a 9.4VAC winding on the primary transformer. Input ripple > is VERY low, maybe 200mV. So, I suspect those regulators need to be > replaced.
Could they be going into thermal shutdown? I don't recall whether linear regulators from that era commonly had thermal shutdown features yet. -- Mark J. Blair, NF6X <n...@nf6x.net> http://www.nf6x.net/
