John Berenyi wrote:
I have both these rigs fully accessorized. The 515 has the sherwood
filters, speaker, keypad controller, memory unit, 10-turn pot, etc. The R7A
has speaker and all the Drake filters for SWLing and the RV75. I also use
Sherwood's SE-3 Synch Detector with both rigs. I'm contemplating (lighlty)
to sell one of them but I"m having a hard time with choosing. They are both
unique in their own way. Both are 5-Star rated receivers. What do you guys
think?

Tough decision.

I have both. As far as performance goes, I think the R7 has the edge.
The R7 has a notch filter and the 515 doesn't. The R7 has a good noise
blanker, while the 515's noise blanker is generally useless. The R7
seems to be more sensitive at lower frequencies. However, the 515 is
built like a tank and should last longer. My R7 has had 2 component
failures already, while the 515 just keeps on truckin. New receivers
come and go, yet none of them seem to have the "magic" of the R7 and
515. Maybe it's because they're both real radios instead of computers
with RF circuitry thrown in.

If I were you, I'd keep them both. Otherwise, it's a coin toss.