My original PSA05R-090 adapter is failing, giving up the ghost too. I
remember that I had a few new RadioShack power adapters from when they
went bankrupt a few years ago. I also had a bunch of their
interchangeable cord tips at hand in our garage. A smaller yellow one
from the collection does the job admirably, powered from a 6V (but 800mA
vs the Duet stock power adapter's 560mA one). It has (approximately?)
the 3.5mm OD & 1.05 ID required by the Duet. The receiver stays cool
after hours of testing initially and now of operation. Fortunately, I
found in the same box another 273-1761. Since I have a 2nd Duet in our
master bedroom I'm saving it for when the same need arises soon probably
(I've had those Duets since early 2009!). You could also use a R.S.
model 273-1770 PA which is a more closely matched adapter (9V as the
stock one, and 800mA) if you have or find one on eBay, etc. The problem
here is to match it with the correct smaller interchangeable yellow plug
needed. 



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