Jim (Jea48), some rear panel photos I found confirm that as Srafi said just above SOME versions of the KRS200 did not provide an XLR connector, but instead provided two RCA connectors, one designated as inverting and one as non-inverting. Lettering on the rear of those amps indicates that they are designed to be driven with a balanced pair of signals, so the "converter" Srafi referred to presumably just routes each of the two signals it receives via an XLR connector into a corresponding RCA plug.
Srafi 7-2-2016 2:22 am
...is there a way to get RCA to split the same way?
No, since the RCA outputs of the preamp do not provide both an inverted and a non-inverted signal.
What may be worth trying, though, is connecting the left channel RCA output of the preamp to the non-inverted input of the left channel amp, and connecting the right channel RCA output of the preamp to the non-inverted input of the right channel amp, and inserting an RCA shorting plug into the inverted input of both amps. Depending on the design of the amp that may work fine, although with a 6 db reduction in gain. Or, again depending on the specific design, it may result in a large reduction in power capability, as well as some degree of sonic compromise. Without being familiar with the design of the amp, my guess is that the odds are in favor of it working well, with just the gain reduction I mentioned.
The only other approach I can think of, besides having the preamp repaired, would be to connect the RCA outputs of the preamp to a pair of single-channel
Jensen Transformers, one for each amp, that would convert each of the unbalanced signals from the preamp to a balanced pair of signals. It would provide those signals on an XLR connector, which would then be connected to the existing "converter."
Regards,
-- Al