I have owned Drake A-line, B-line and C-line equipment. I acquired a
Heath SB-300 while I owned the B-line and was shocked to find the Drake's
selectivity was noticeably inferior to the SB-300's selectivity. This was
due to Drake's use of an L/C network to achieve variably selectivity, while the
Heath receiver used crystal lattice filters for this purpose. The C-line,
especially the later models (serial numbers above 14,000) solved the problem by
replacing the L/C circuit with high quality crystal filters comparable to those
used in the Heath equipment. However, I have always been partial to the
dial and PTO drive used in the B-line and, hence never upgraded to the T-4XC to
match my R-4C. One admittedly gives up the phased-lock loop of the C-line,
which assures precise transceive frequency matching between the transmitter and
receiver. I find this a minor drawback since the Drake PTOs are so stable
and hold transceive alignment for years and are very simply brought back into
alignment when they shift apart perceptibly in frequency.
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