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Seems like the R-390 has been left out. No, I do not mean the R-390A. The
R-390A was designed to be a lsee expensive version of the R-390. The R-390 uses LC filters, which can yield better audio than the 390A, with the mechanical filters. The mechanical filters also inserted a phase shift of the signal. Best to have one of each. Colin K7FM |
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