On 6/4/2020 2:49 PM, Gary Johnson wrote: > Output is fixed right at 12V but there are notes on the web about how to change an internal feedback resistor to tweak that up a bit. Thanks Gary. Do you know how high V+ can be set? Some radios, notably Elecraft rigs, have lower IMD at higher supply voltages, with 15V max. 73, Jim K9YC